Gender agreement in zoological nomenclature

Specific names can either be changeable (Latin adjectives with different declinations according to the gender of the genus, like albus, alba, album) or unchangeable (nouns and adjectives that don't change, like splendens, splendens, splendens).
We are only interested in recognizing changeable adjectives. Unchangeable adjectives behave exactly like nouns and it is not even necessary to know what exactly they are.
Changeable adjectives can only have seven endings, nouns can have all endings.
Endings of changeable adjectives (but caution, nouns can have the same endings) can only be:

-a (38 %), -e (3.3 %), -um (3.3 %), -er (0.9 %), -ior (0.2 %), -is (13 %), -us (21 %)

All other endings indicate unchangeable names, either nouns or unchangeable adjectives.
Our problem is that 80 % of the zoological names of species have exactly these endings.

Numerals:

1  uni-
2  bi-   
3  tri-
4  quadri-
5 quinque-
6  sex-
7  septem-
8  octo-
9  novem-
10  decem-

11  undedim-
12  duodecim-
13  tredecim- (not tridecim-)
14  quattuordecim- (not quatuordecim-)
15  quindecim-
16  sedecim- (not sexdecim-)
17  septendecim- (not septemdecim-)
18  octodecim- (not duodeviginti-)
19  novendecim- (not unusdeviginti-, not novemdecim-)
20  viginti-

21  vigintiunus- (not unusetviginti-)
22  vigintiduo- (not duoetviginti-)
23  vigintitres-
24  vigintiquattuor- (not vigintiquatuor-)
25  vigintiquinque- (not quinqueetviginti-)
26  vigintisex-
27  vigintiseptem- (not septemetviginti-)
28  vigintiocto- (not octoetviginti, not duodetriginti-)
29  vigintinovem- (not novemetviginti-, not unusdetriginti-)

 

 

 

 

 

30  triginti-
32  trigintiduo- (not duoettriginti-)
40  quadraginti-
100  centem-

List of names

abacus  unchangeable    
abdominalis, -is, -e    changeable      
abietis unchangeable    
accedula        unchangeable    
acer, acris, acre       changeable      
aceris  unchangeable    
actaceus, -a, -um       changeable      
acus    unchangeable    
acutus, -a, -um changeable      
admetus unchangeable    
adonis  unchangeable    
adversus, -a, -um       changeable      
aeneus, -a, -um changeable      
aequalis, -is, -e       changeable      inaequalis, etc.
aetolus unchangeable    
afer, afra, afrum       changeable      
affinis, -is, -e        changeable      
agilis, -is, -e changeable      
agrarius, -a, -um       changeable      
agrestis, -is, -e       changeable      
agricola        unchangeable    
alacer, alacris, alacre changeable      
alatus, -a, -um changeable      
albipes unchangeable    
albus, -a, -um  changeable      
alexis  unchangeable    
alliarius, -a, -um      changeable      
alpestris, -is, -e      changeable      
alpicola        unchangeable    
alpinus, -a, -um        changeable      
alpium  unchangeable    
altaiensis      unchangeable    
alternatus, -a, -um     changeable      
altus, -a, -um  changeable      
amathusia       unchangeable    
americanus, -a, -um     changeable      
amiralis        unchangeable    
ammiralis       unchangeable    
ampulla unchangeable    
ampullatus, -a, -um     changeable      
anfractus       unchangeable    trianfractus, etc.
angularis, -is, -e      changeable      subangularis, triangularis, etc.
angulatus, -a, -um      changeable      
angulosus, -a, -um      changeable      biangulosus, etc.
annulatus, -a, -um      changeable      
anser   unchangeable    
anseris unchangeable    
apoda   unchangeable    
appendiculatus, -a, -um changeable      
aprilinus, -a, -um      changeable      
apterus, -a, -um        changeable      
aquaticus, -a, -um      changeable      
aquatilis, -is, -e      changeable      
arboreus, -a, -um       changeable      
arcticus, -a, -um       changeable      
arenarius, -a, -um      changeable      
argentatus, -a, -um     changeable      
argenteus, -a, -um      changeable      
argiolus        unchangeable    
argus   unchangeable    
argutus, -a, -um        changeable      
arietis unchangeable    
armatus, -a, -um        changeable      
arvalis, -is, -e        changeable      
asiaticus, -a, -um      changeable      
asinus  unchangeable    
asper, -era, -erum      changeable      
aspersus, -a, -um       changeable      
asteris unchangeable    
atalanta        unchangeable    
ater, atra, atrum       changeable      
atomarius, -a, -um      changeable      
atratus, -a, -um        changeable      
aulicus, -a, -um        changeable      
aurantius, -a, -um      changeable      
auratus, -a, -um        changeable      
aureolatus, -a, -um     changeable      
aureus, -a, -um changeable      
auricomus, -a, -um      changeable      
aurinia unchangeable    
auritus, -a, -um        changeable      inauritus, etc.
aurora  unchangeable    
australis, -is, -e      changeable      
autumnalis, -is, -e     changeable      
avellanarius, -a, -um   changeable      
avenaceus, -a, -um      changeable      

baldus  unchangeable    
balthicus, -a, -um      changeable      
barbarus, -a, -um       changeable      
barbatus, -a, -um       changeable      
blandus, -a, -um        changeable      
bodoensis       i dont know     
borealis, -is, -e       changeable      
boreas  unchangeable    
boreus, -a, -um changeable      
brachypterus, -a, -um   changeable      
brachyurus, -a, -um     changeable      
bracteatus, -a, -um     changeable      
brasiliensis, -is, -e   changeable      
brevis, -is, -e changeable      
brunneus, -a, -um       changeable      
bucephalus, -a, -um     changeable      
bulla   unchangeable    
bullatus, -a, -um       changeable      

caballus        unchangeable    
caementarius, -a, -um   changeable      
caeruleus, -a, -um      changeable      
caesius, -a, -um        changeable      
caffer, caffra, caffrum changeable      
calamitosus, -a, -um    changeable      
calcaratus, -a, -um     changeable      
calidris        unchangeable    
campestris, -is, -e     changeable      
cancellatus, -a, -um    changeable      
cancellus       unchangeable    
candidus, -a, -um       changeable      
cantans unchangeable    
capensis, -is, -e       changeable      
capotea unchangeable    
capreolus       unchangeable    
capybara        unchangeable    
cardinalis, -is, -e     changeable      
carinatus, -a, -um      changeable      
cariosus, -a, -um       changeable      
caspius, -a, -um        changeable      
catena  unchangeable    
caudacutus, -a, -um     changeable      
caudatus, -a, -um       changeable      
centaurus       unchangeable    
centralis, -is, -e      changeable      
ceronus i dont know     
chloroticus, -a, -um    changeable      
chrysis i dont know     
ciliaris, -is, -e       changeable      
cinctus, -a, -um        changeable      novemcinctus, tricinctus, etc.
cinereus, -a, -um       changeable      
circinatus, -a, -um     changeable      
circinnatus, -a, -um    changeable      
citellus        unchangeable    
citreolus, -a, -um      changeable      
civetta unchangeable    
clathratus, -a, -um     changeable      
clathrus        unchangeable    
clavatus, -a, -um       changeable      
clavus  unchangeable    
cleobis unchangeable    
coeruleatus, -a, -um    changeable      
coeruleus, -a, -um      changeable      
collaris, -is, -e       changeable      
collis  unchangeable    albicollis, ruficollis, etc
color   unchangeable    bicolor, tricolor, unicolor, concolor, discolor, diversicolor, etc.
colorus, -a, -um        changeable      bicolorus, tricolorus, ruficolorus, etc.
comatus, -a, -um        changeable      
comis, -is, -e  changeable      
comma   unchangeable    
communis, -is, -e       changeable      
complanatus, -a, -um    changeable      
complanus, -a, -um      changeable      
compressus, -a, -um     changeable      
conchilega      unchangeable    
confusus, -a, -um       changeable      
conicus, -a, -um        changeable      
connatus, -a, -um       changeable      
conoideus, -a, -um      changeable      
conulus unchangeable    
cordatus, -a, -um       changeable      bicordatus, etc.
cordiger        unchangeable    
cornis, -is, -e changeable      bicornis, etc.
cornutus, -a, -um       changeable      
corollaris, -is, -e     changeable      
coronalis, -is, -e      changeable      
coronatus, -a, -um      changeable      
corticatus, -a, -um     changeable      
costa   unchangeable    filicosta, gracilicosta, milicosta, magnicosta, etc.
costatus, -a, -um       changeable      
crassus, -a, -um        changeable      
crenatus, -a, -um       changeable      
cribrarius, -a, -um     changeable      
cristatus, -a, -um      changeable      
cruciatus       unchangeable    
crucifer        unchangeable    
cruentus, -a, -um       changeable      
curvatus, -a, -um       changeable      
cuspidatus, -a, -um     changeable      tricuspidatus, etc.
cyanus, -a, -um changeable      
cyathina        unchangeable    
cylindraceus, -a, -um   changeable      
cylindricus, -a, -um    changeable      
cyllarus        unchangeable    
cynthia unchangeable    
cytheris        unchangeable    

dactylus, -a, -um       changeable      
dardanus, -a, -um       changeable      
dauricus, -a, -um       changeable      
dauuricus, -a, -um      changeable      
decumana        unchangeable    
decumanus       unchangeable    
dentalis        unchangeable    
dentatus, -a, -um       changeable      bidentatus, tridentatus, unidentatus, etc.
depressior      unchangeable    
depressus, -a, -um      changeable      
diadema unchangeable    
diadematus, -a, -um     changeable      
differens       unchangeable    
difficilis, -is, -e     changeable      
digitatus, -a, -um      changeable      deciesdigitatus, octiesdigitatus, etc.
dilatatus, -a, -um      changeable      
distinctus, -a, -um     changeable      
distortus, -a, -um      changeable      
docilis, -is, -e        changeable      
domesticus, -a, -um     changeable      
dominulus, -a, -um      changeable      
dorsalis, -is, -e       changeable      
dorus   unchangeable    
dorylas unchangeable    
dubius, -a, -um changeable      
dypterigius, -a, -um    changeable      

eburneus, -a, -um       changeable      
echinatus, -a, -um      changeable      
edentulus, -a, -um      changeable      
edulis, -is, -e changeable      
elegans unchangeable    
empetra unchangeable    
epeus   unchangeable    
equestris, -is, -e      changeable      
equinus, -a, -um        changeable      
ervum   unchangeable    
erythraeus, -a, -um     changeable      
erythrinus, -a, -um     changeable      
esculentus, -a, -um     changeable      
eudora  unchangeable    
excavatus, -a, -um      changeable      
exilis, -is, -e changeable      
exsoletus, -a, -um      changeable      
exustus, -a, -um        changeable      

faba    unchangeable    
falcatus, -a, -um       changeable      
fasciatus, -a, -um      changeable      trifasciatus, quaterfasciatus, sexiesfasciatus, unifasciatus, etc.
fascicularis, -is, -e   changeable      
fasciolatus, -a, -um    changeable      
fauna   unchangeable    
fenestralis, -is, -e    changeable      
fenestratus, -a, -um    changeable      
ferrugineus, -a, -um    changeable      
ferus, -a, -um  changeable      
festivus, -a, -um       changeable      
fidus, -a, -um  changeable      bifidus, quadrifidus, trifidus, etc.
figuraevetustae unchangeable    
fimbriatus, -a, -um     changeable      
fissura unchangeable    
flammeus, -a, -um       changeable      
flavatus, -a, -um       changeable      
flaveolus, -a, -um      changeable      
flavus, -a, -um changeable      
floralis, -is, -e       changeable      
florus, -a, -um changeable      
fluviatilis, -is, -e    changeable      
foina   unchangeable    
foliatus, -a, -um       changeable      
fontinalis, -is, -e     changeable      
formis, -is, -e changeable      araneiformis, filiformis, pyriformis, reniformis, scutiformis, tubiformis, vespiformis, etc.
formosus, -a, -um       changeable      
fossa   unchangeable    
fossilis, -is, -e       changeable      
fragilis, -is, -e       changeable      
fragrans        unchangeable    
frondosus, -a, -um      changeable      
frons   unchangeable    
frustulosa      i dont know     
fucatus, -a, -um        changeable      
fuliginosus, -a, -um    changeable      
furcifer        unchangeable    
furciferus, -a, -um     changeable      
furunculus      unchangeable    
fuscatus, -a, -um       changeable      
fuscus, -a, -um changeable      
fusus   unchangeable    

galbula unchangeable    
galerus, -a, -um        changeable      
gallina unchangeable    
gasteropelecus  unchangeable    
gemmatus, -a, -um       changeable      
gibberulus, -a, -um     changeable      
gibbosus, -a, -um       changeable      
giganteus, -a, -um      changeable      
glaber, -a, -um changeable      
glacialis, -is, -e      changeable      
glis    unchangeable    
globosus, -a, -um       changeable      semiglobosus, subglobosus, etc.
globularis, -is, -e     changeable      
glomeratus, -a, -um     changeable      
glycimeris      unchangeable    
glyphicus, -a, -um      changeable      
gordius unchangeable    
gracilis, -is, -e       changeable      
grandifer, -fera, -ferum        changeable      
grandior, -ior, -ius    changeable      
grandis, -is, -e        changeable      
granulatus, -a, -um     changeable      
gratilla        unchangeable    
gravis, -is, -e changeable      
gregalis, -is, -e       changeable      
gregarius, -a, -um      changeable      
griseus, -a, -um        changeable      
grossus, -a, -um        changeable      
guttatus, -a, -um       changeable      biguttatus, triguttatus, etc.
gutturosus, -a, -um     changeable      

hastatus, -a, -um       changeable      
hecticus, -a, -um       changeable      
helicinus, -a, -um      changeable      
helvolus, -a, -um       changeable      
hemionus        unchangeable    
hemisphaericus, -a, -um changeable      
hermaphrodita   unchangeable    
hermaphroditus  unchangeable    
heteroclita     unchangeable    
hippelaphus     unchangeable    
hircus  unchangeable    
hispidus, -a, -um       changeable      
hortensis, -is, -e      changeable      
horticola       unchangeable    
hudsonius, -a, -um      changeable      
humeralis, -is, -e      changeable      
humilis, -is, -e        changeable      
hydatidis       unchangeable    
hydrochaeris    unchangeable    
hydrus  unchangeable    
hyematus, -a, -um       changeable      
hyrcanus        unchangeable    

ianira  unchangeable    
ianthe  unchangeable    
iberis  unchangeable    
icarus  unchangeable    
ignobilis, -is, -e      changeable      
imperalis, -is, -e      changeable      
imperialis, -is, -e     changeable      
inauratus, -is, -e      changeable      
incertus, -is, -e       changeable      
indicus, -a, -um        changeable      
infundibulum    unchangeable    
innotatus, -a, -um      changeable      
inquilinus      unchangeable    
insularis, -is, -e      changeable      
intestinalis, -is, -e   changeable      
jubatus, -a, -um        changeable      

labris  unchangeable    
lacteolus       changeable      
lacustris, -is, -e      changeable      
laevis, -is, -e changeable      
laganum unchangeable    
lagopus unchangeable    
lagurus, -a, -um        changeable      
lamda   unchangeable    
lamia   unchangeable    
lanatus, -a, -um        changeable      
lanceolatus, -a, -um    changeable      
lateralis, -is, -e      changeable      
lateritius, -a, -um     changeable      
lathyrus        unchangeable    
latus, -a, -um  changeable      
lemma   unchangeable    
lemmus  unchangeable    
lenticularis, -is, -e   changeable      
lentus, -a, -um changeable      
leodorus        i dont know     
leopardus       unchangeable    
leporinus, -a, -um      changeable      
leucocephalus, -a, -um  changeable      
leucomelus, -a, -um     changeable      
limacina        unchangeable    
limbatus, -a, -um       changeable      albolimbatus, etc.
linearis, -is, -e       changeable      
lineatus, -a, -um       changeable      trilineatus, etc.
littoralis, -is, -e     changeable      
littoreus, -a, -um      changeable      
lividus, -a, -um        changeable      
lixula  unchangeable    
lobatus, -a, -um        changeable      
lobus, -a, -um  changeable      bilobus, quadrilobus, rufilobus, trilobus, etc.
longissimus, -a, -um    changeable      
lucidus, -a, -um        changeable      
luciola unchangeable    
lugubris, -is, -e       changeable      
lunaris, -is, -e        changeable      
lunatus, -a, -um        changeable      
lunula  unchangeable    
lunulatus, -a, -um      changeable      
luperus unchangeable    
lupus   unchangeable    
luridus, -a, -um        changeable      
luteus, -a, -um changeable      

macer, macris, macre    changeable      
macrourus, -a, -um      changeable      
maculatus, -a, -um      changeable      bimaculatus, trimaculatus, etc.
magnus, -a, -um changeable      
maior, maius    changeable      
malaccensis, -is, -e    changeable      
mammillaris, -is, -e    changeable      
maraena unchangeable    
maraenula       unchangeable    
marginalis, -is, -e     changeable      
marginatus, -a, -um     changeable      
marinus, -a, -um        changeable      
maritimus, -a, -um      changeable      
marmoratus, -a, -um     changeable      
massa   unchangeable    
maturus, -a, -um        changeable      
maurus, -a, -um changeable      
mediterraneus, -a, -um  changeable      
medusa  unchangeable    
megaera unchangeable    
melampus        unchangeable    
melanogaster    unchangeable    
meleager        unchangeable    
membranaceus, -a, -um   changeable      
mentula unchangeable    
mentulatus, -a, -um     changeable      
meridionalis, -is, -e   changeable      
meticulosus, -a, -um    changeable      
mexicanus, -a, -um      changeable      
microphthalmus, -a, -um changeable      
migratorius, -a, -um    changeable      
miliaris, -is, -e       changeable      
miniatus, -a, -um       changeable      
minimus, -a, -um        changeable      
minor, minus    changeable      
minutus, -a, -um        changeable      
mirabilis, -is, -e      changeable      
moeris  unchangeable    
mola    unchangeable    
mollis, -is, -e changeable      
mona    unchangeable    
monacha unchangeable    
monachus        unchangeable    
mongolicus, -a, -um     changeable      
monotis unchangeable    
monticola       unchangeable    
morella unchangeable    
morpheus        unchangeable    
mucidus, -a, -um        changeable      
mundus, -a, -um changeable      
muraena unchangeable    
muralis, -is, -e        changeable      
muricatus, -a, -um      changeable      bimuricatus, etc.
murinus, -a, -um        changeable      
mursa   unchangeable    
mutus, -a, -um  changeable      
mystaceus, -a, -um      changeable      

nanus, -a, -um  changeable      
nasus   unchangeable    
nasutus, -a, -um        changeable      
navalis, -is, -e        changeable      
navicula        unchangeable    
nebulosus, -a, -um      changeable      
nemoralis, -is, -e      changeable      
niger, -nigra, - nigrum changeable      
nimbosus, -a, -um       changeable      
nitidus, -a, -um        changeable      
nivalis, -is, -e        changeable      
niveus, -a, -um changeable      
nobilis, -is, -e        changeable      
novus, -is, -e  changeable      
nucleus unchangeable    
nyroca  unchangeable    

obscurus, -a, -um       changeable      
obsoletus, -a, -um      changeable      
occidentalis, -is, -e   changeable      
oceanicus, -a, -um      changeable      
ocellaris       unchangeable    
ocellatus, -a, -um      changeable      
octodentatus, -a, -um   changeable      
octoguttatus, -a, -um   changeable      
oeconomicus     unchangeable    
oeconomus       unchangeable    
officinalis, -is, -e    changeable      
ogotona unchangeable    
opercularis, -is, -e    changeable      
orbicularis, -is, -e    changeable      
orbiculatus, -a, -um    changeable      
orientalis, -is, -e     changeable      
ornatus, -a, -um        changeable      
ovalis, -is, -e changeable      
ovatus, -a, -um changeable      
oxycephalus, -a, -um    changeable      
paleaceus, -a, -um      changeable      
pallidatus, -a, -um     changeable      
pallidulus, -a, -um     changeable      
pallidus, -a, -um       changeable      
paludosus, -a, -um      changeable      
palustris, -is, -e      changeable      
pamphilius, -a, -um     changeable      
pamphilus, -a, -um      unchangeable    
paniscus        unchangeable    
papaveris       unchangeable    
papillosus, -a, -um     changeable      
paradoxus, -a, -um      changeable      
partitus, -a, -um       changeable      bipartitus, tripartitus, etc.
parvulus, -a, -um       changeable      
parvus, -a, -um changeable      
passerinus, -a, -um     changeable      
passeris        unchangeable    
patellaris, -is, -e     changeable      
patulus, -a, -um        changeable      
pavidus, -a, -um        changeable      
pedicularius, -a, -um   changeable      
pediculus       unchangeable    
pelagicus, -a, -um      changeable      
pelecus unchangeable    
pellucidus, -a, -um     changeable      
penicillus      unchangeable    
peregrinus, -a, -um     changeable      
peregusna       unchangeable    
perforatus, -a, -um     changeable      bisperforatus, quaterperforatus, sexiesperforatus, etc.
perla   unchangeable    
perlatus, -a, -um       changeable      
persicus, -a, -um       changeable      
perversus, -a, -um      changeable      
philanthus      unchangeable    
philoxenus      unchangeable    
phthalmus, -a, -um      changeable      
pictus, -a, -um changeable      
pileus  unchangeable    
pilosellus, -a, -um     changeable      
pilosus, -a, -um        changeable      
pilula  unchangeable    
pirinus, -a, -um        changeable      
planatus, -a, -um       changeable      
planicornis, -is, -e    changeable      
planorbis       unchangeable    
planus, -a, -um changeable      
plestya unchangeable    
plumipes        unchangeable    
plumosus, -a, -um       changeable      
pluvialis, -is, -e      changeable      
pocillum        unchangeable    
podalirius, -a, -um     changeable      
politus, -a, -um        changeable      
polyphemus      unchangeable    
porca   unchangeable    
porcatus, -a, -um       changeable      
porcellus       unchangeable    
porcus  unchangeable    
prasinarius, -a, -um    changeable      
prasinus, -a, -um       changeable      
pratensis, -is, -e      changeable      
principalis, -is, -e    changeable      
procer, procris, procre changeable      
proserpina      unchangeable    
puber   unchangeable    
pubera  unchangeable    
pulchellus, -a, -um     changeable      
pulcher, -ra, -rum      changeable      
pulverulentus, -a, -um  changeable      
pumilionis      unchangeable    
punctatus, -a, -um      changeable      tripunctatus, unipunctatus, etc.
purpureus, -a, -um      changeable      
pusillus, -a, -um       changeable      
pustulatus, -a, -um     changeable      
pustulosus, -a, -um     changeable      
putrinus, -a, -um       changeable      
pygargus, -a, -um       changeable      
pygmeus, -a, -um        changeable      

querulus, -a, -um       changeable      
radiatus, -a, -um       changeable      biradiatus, multiradiatus, quaterradiatus, striatoradiatus, etc.
reduncus, -a, -um       changeable      
regalis, -is, -e        changeable      
regius, -a, -um changeable      
regularis, -is, -e      changeable      
regulus unchangeable    
reticulatus, -a, -um    changeable      
reticulum       unchangeable    
ridibundus, -a, -um     changeable      
riparius, -a, -um       changeable      
rivularis, -is, -e      changeable      
rosaceus, -a, -um       changeable      
roseus, -a, -um changeable      
rostratus, -a, -um      changeable      
rostris unchangeable    
rotundus, -a, -um       changeable      subrotundus, etc.
ruber, rubra, rubrum    changeable      
rubricollis     unchangeable    
rudis, -is, -e  changeable      
ruficollis      unchangeable    
rufinus, -a, -um        changeable      
rugosus, -a, -um        changeable      
rupestris, -is, -e      changeable      
rupium  unchangeable    
rusticus, -a, -um       changeable      
rutilus, -a, -um        changeable      

sabulosus, -a, -um      changeable      
saetosus, -a, -um       changeable      
sagitta unchangeable    
saida   unchangeable    
salicis unchangeable    
sanguinarius, -a, -um   changeable      
sanguineus, -a, -um     changeable      
sardicus, -a, -um       changeable      
saturninus, -a, -um     changeable      
satyra  unchangeable    
satyrus unchangeable    
saxatilis, -is, -e      changeable      
scalaris, -is, -e       changeable      
scutatus, -a, -um       changeable      
scytha  unchangeable    
secale  unchangeable    
secalis unchangeable    
segetis, -is, -e        changeable      
segetum unchangeable    
sellatus, -a, -um       changeable      
senilis, -is, -e        changeable      
sericeus, -a, -um       changeable      
serratus, -a, -um       changeable      
setosus, -a, -um        changeable      
sibilla unchangeable    
sibiricus, -a, -um      changeable      
signatus, -a, -um       changeable      
silena  unchangeable    
silenus unchangeable    
sileris unchangeable    
silvaticus, -a, -um     changeable      
similis, -is, -e        changeable      
singularis, -is, -e     changeable      
sinicus, -a, -um        changeable      
sinuatus, -a, -um       changeable      
sitibundus, -a, -um     changeable      
socialis, -is, -e       changeable      
socius, -a, -um changeable      
solidus, -a, -um        changeable      
solstitialis, -is, -e   changeable      
sororcula       unchangeable    
speciosus, -a, -um      changeable      
spectrum        unchangeable    
spinosulus, -a, -um     changeable      
spinosus, -a, -um       changeable      bispinosus, multispinosus, quadrispinosus, subspinosus, trispinosus, etc.
spiralis        unchangeable    
stabilis, -is, -e       changeable      
stagnalis, -is, -e      changeable      
stellaris, -is, -e      changeable      
stellatus, -a, -um      changeable      
stellifer, stellifera, stelliferum      changeable      
striatulus, -a, -um     changeable      
striatus, -a, -um       changeable      
strigatus, -a, -um      changeable      
strigula        unchangeable    
stupidus, -a, -um       changeable      
stylatus, -a, -um       changeable      tetrastylatus, etc.
suberosus, -a, -um      changeable      
subterraneus, -a, -um   changeable      
subtilis, -is, -e       changeable      
subucula        unchangeable    
subuculus       unchangeable    
suillus, -a, -um        changeable      
sulcatus, -a, -um       changeable      
suslica unchangeable    
sutorius, -a, -um       changeable      
suturalis, -is, -e      changeable      
sylvaticus, -a, -um     changeable      
sylvestris, -is, -e     changeable      
sylvicola       unchangeable    

tabidus, -a, -um        changeable      
talpinus, -a, -um       changeable      
tarpeius, -a, -um       changeable      
tataricus, -a, -um      changeable      
taurus  unchangeable    
taxus   unchangeable    
telegonus       unchangeable    
tenebrosus, -a, -um     changeable      
tenuis, -is, -e changeable      
tepidus, -a, -um        changeable      
terrestris, -is, -e     changeable      
tessella        unchangeable    
tessellatus, -a, -um    changeable      
testaceus, -a, -um      changeable      
tettigonus      unchangeable    
thalassinus, -a, -um    changeable      
thetis  unchangeable    
thoracicus, -a, -um     changeable      
thymifolia      unchangeable    
tibialis, -is, -e       changeable      
tigrinus, -a, -um       changeable      
tomentosus, -a, -um     changeable      subtomendosus, etc.
toreumaticus, -a, -um   changeable      
torquatus, -a, -um      changeable      
torris  unchangeable    
transfuga       unchangeable    
transversalis, -is, -e  changeable      
transversus, -a, -um    changeable      
tremulus, -a, -um       changeable      
tribulum        unchangeable    
tribulus        unchangeable    
tridens unchangeable    
trigrammus, -a, -um     changeable      
trilaterus, -a, -um     changeable      
triquetrus, -a, -um     changeable      
tristis, -is, -e        changeable      
trivius, -a, -um        changeable      
truncatus, -a, -um      changeable      
tuberculatus, -a, -um   changeable      bituberculatus, quadrituberculatus, octotuberculatus, etc.
tuberum unchangeable    
tubicola        unchangeable    
tulipa  unchangeable    
turcicus, -a, -um       changeable      
tyndarus        unchangeable    
typhlus unchangeable    

umbilicalis, -is, -e    changeable      
umbilicus       unchangeable    
umbra   unchangeable    
umbratus, -a, -um       changeable      
uncia   unchangeable    
undatus, -a, -um        changeable      
undulatus, -a, -um      changeable      
ungulatus, -a, -um      changeable      
ursus   unchangeable    

vacuus, -a, -um changeable      
vagabundus, -a, -um     changeable      
vagus, -a, -um  changeable      
valgus, -a, -um changeable      
variabilis, -is, -e     changeable      
variegatus, -a, -um     changeable      
variolaris      unchangeable    
variolosus, -a, -um     changeable      
varius, -a, -um changeable      
velifer, velifera, veliferum    changeable      
velitaris, -is, -e      changeable      
velleda unchangeable    
velutinus, -a, -um      changeable      
venosus, -a, -um        changeable      
ventralis, -is, -e      changeable      
ventricosus, -a, -um    changeable      
ventris unchangeable    
vermicularis, -is, -e   changeable      
vermiculatus, -a, -um   changeable      
vernalis, -is, -e       changeable      
vernus, verna, vernum   i dont know (alle haben unterschiedliche Bedeutungen)
versicolorius, -a, -um  changeable      
versipellis, -is, -e    changeable      
verticalis, -is, -e     changeable      
vespertinus, -a, -um    changeable      
vestitus, -a, -um       changeable      
vetulus, -a, -um        changeable      
vicia   unchangeable    
viduatus, -a, -um       changeable      
villica, -co, -cus      changeable      
villosus, -a, -um       changeable      
viminalis       unchangeable    
violaceus, -a, -um      changeable      
virgatus, -a, -um       changeable      
virginianus, -a, -um    changeable      
virgula unchangeable    
viridis, -is, -e        changeable      
viridulatus, -a, -um    changeable      
viridulus, -a, -um      changeable      
vitis   unchangeable    
vitreus, -a, -um        changeable      
vittatus, -a, -um       changeable      bivittatus, trivittatus, albovittatus, etc.
vivparus, -a, -um       changeable      
volva   unchangeable    
vulgaris, -is, -e       changeable      
vulpecula       unchangeable    

zebra   unchangeable    
zelima  unchangeable    
zenobia unchangeable    
zerta   unchangeable    
zizyphinus      unchangeable    
zonarius, -a, -um       changeable      

 

 

How to recognize a Latin adjective

It is not easy to distinguish a Latin adjective from a Latin noun. To see if a name is an adjective or not, it is necessary to consult a Latin standard dictionary. And make sure that your dictionary is not too small. It is practically not possible to feed a computer program to distinguish nouns and adjectives. Some words can be both, only the context in the original source decides.

You can also consult Sherborn's Index Animalium, to see if changed versions of the same name exist. But Sherborn made many mistakes, or copied incorrectly formed names from original sources, and is not reliable. The same applies to AnimalBase or other sources - many zoologists established incorrect names, which must stand.
Examples:
faber is usually a noun, glaber is an adjective. If a zoologist established a name fabra, this must stand, faber can also be an adjective.
fiber is a noun, liber is an adjective.
zebra is a noun, glabra is an adjective.
frater is a noun, ater is an adjective.

Nouns with adjectival endings become adjectives: -ana, -aria, -ata, -ella, -iensis, -ina, -osa.
Examples:
fiberata, fibulata, brasiliensis, migratoria, riedeliana, victorina,
victoriana, victoriensis.

Names ending in -icola are usually nouns.

Sometimes it is very difficult to decide whether a name is an adjective or not. Geographical names are not contained in dictionaries, for these there  is no help at all. In living languages you ask a native speaker to solve such problems.
Examples:

Latin nouns are not changed to agree in gender with that of the genus. A substantival specific name describing a female animal is not changed to its male component if combined with a masculine genus.
Examples:

How to change the Latin adjective

Some Latin words can be adjectives and nouns at the same time. If the author did not treat such a name as an adjective, it must be treated as a noun (Art. 31.2.2).
This concerns words ending in -ifer/-ifera/-iferum and -iger/-igera/-igerum. For this determination it is necessary to know Latin quite well. I do not know a case where the original name was treated as an adjective. A name nanum is certainly an adjective, but nana or nanus could also be nouns. The same applies to pergrinus, peregrina, peregrinum. monacha and monachus seem to be "pure" nouns, but this might depend from the size of your dictionary.
The resulting problem is that in many cases Art. 31.2.2 is not followed because most authors are not sufficiently skilled in Latin.
Examples:

In zoological Latin the three genders feminine (58 %), masculine (38 %) and neuter (4 %) are not evenly distributed in the language, neuter is very rare. When Latin was spread to other parts of Italy, to S France, Catalonia, central Spain, Portugal, Galicia, N France and Romania, the neuter gender was lost, probably because people forgot how to apply the correct declinations, and merged usually with masculine. In scientific zoology we have the same trend, not many taxonomists know the correct declinations for the neuter gender.

Declination of adjectives in the nominative singular

It is necessary to consult a standard Latin dictionary to know the form of declination of an adjective ending in -er. There are currently no good online Latin dictionaries where the solution could be found reliably. It is not possible to get this information automatically, to feed a computer program with such information.
Here I give some relatively frequent examples of adjectival names, only in the nominative singular. If a name was established in another case, it is necessary to consult a complete Latin grammar collection to learn which form of which of the 5 cases singular or plural could apply for the adjective.
Example:
The name pavidam, established in the accusative singular in the genus Musca (Diptera), must be pavida in the nominative singular.

The sorting in such lists is always masculine - feminine - neuter.

-us, -a, -um. Adjectives ending in -us. Some 60 % of all zoological names are adjectives in this form.
Examples:
albus, alba, album
signatus, signata, signatum
migratorius, migratoria, migratorium
pavidus, pavida, pavidum
gibberulus, gibberula, gibberulum
bicolorus, bicolora, bicolorus
(but not: bicolor)

-er, -ra, -rum. Adjectives ending in -er with e not contained in the word
stem. 0.5-1 % of the zoological names.
Examples:
niger, nigra, nigrum
ater, atra, atrum
pulcher, pulchra, pulchrum

More: afer, cafer, caffer, dexter, glaber, ruber, scaber, teucer

-er, -era, -erum. Adjectives ending in -er with e contained in the word
stem. Only few names.
Examples:
asper, aspera, asperum
gibber, gibbera, gibberum
tener, tenera, tenerum
liber, libera, liberum
spinifer, spinifera, spiniferum
cordiger, cordigera, cordigerum

More with ending -ifer (but caution: usually these are nouns!):
anatifer, anguillifer, atomifer, bulbifer, conifer,
costulifer, crucifer, dentifer, discifer, ensifer, furcifer, glandifer,
globulifer, grandifer, granifer, lamellifer, lancifer, ovifer, prolifer, punctifer,
setifer, signifer, speculifer, spinifer, stellifer, tubifer, velifer

Not: lucifer
More with ending -iger (but caution: usually these are nouns!):
annulliger, armiger, claviger, corniger, disciger,
flammiger, furciger, guttiger, palliger, plumiger, punctiger, scutiger,
serriger, setiger, urniger, vittiger

-er, -ris, -re. Adjectives ending in -er with e not contained in the word
stem and 3 endings. Only very few names.
Examples:
acer, acris, acre
More: alacer, macer, procer, trinacer

-er, -eris, -ere. Adjectives ending in -er with e contained in the word
stem and 3 endings. Perhaps only one name in zoology.
Examples:
celer, celeris, celere
Not: aceris, anseris, asteris, cytheris, glycimeris, hydrochaeris, iberis,
moeris, papaveris, passeris, sileris, veris

-is, -is, -e. Adjectives ending in -is with 2 endings. Some 10 % of all zoological names are adjectives in this form.
This is one of the major error sources because zoologists usually do not know that these words must be changed when combined with genera of neuter gender. It is also very difficult to see if such a name is a noun or an adjective.
Examples:
campestris, campestris, campestre
brasiliensis, brasiliensis, brasiliense
capensis, capensis, capense
apiformis, apiformis, apiforme
mollis, mollis, molle
laevis, laevis, laeve
rudis, rudis, rude
tenuis, tenuis, tenue

More: abdominalis, acicularis, aequinoctialis, affinis, agilis, agrestis,
alpestris, angularis, annularis, aquatilis, australis, autumnalis,
borealis, brevis, campestris, centralis, ciliaris, claustralis, collaris,
communis, difficilis, dorsalis, edulis, -ensis, equestris, exilis,
fascicularis, fenestralis, fluviatilis, fontinalis, -formis, fossilis,
fragilis, glacialis, gracilis, grandis, gravis, haemorrhoidalis,
hortensis, humeralis, imperialis, insularis, lacustris, laevis, lateralis,
lenticularis, linearis, littoralis, lunaris, mammillaris, marginalis,
meridionalis, militaris, mirabilis, mollis, muralis, navalis, nemoralis,
nivalis, nobilis, occidentalis, officinalis, opercularis, orbicularis,
orientalis, ovalis, palustris, pluvialis, pratensis, regularis, rivularis,
rudis, rupestris, saxatilis, scalaris, senilis, septentrionalis, similis,
stabilis, stagnalis, stellaris, sylvestris, tenuis, terrestris,
transversalis, tristis, variabilis, ventralis, vermicularis, vernalis,
viridis, vulgaris

Not: abietis, adonis, alexis, -cornis, -collis, calidris, cardinalis, dentalis, fascialis, -labris, ocellaris, -rostris, salicis, -spiralis, -ventris
Still unclear to me:
meleager, meleagris, meleagris
secale, secalis

-x and -ns. Adjectives with only one ending. These are not changed and behave like nouns. 3 % of the zoological names have these endings.
Examples (could also be nouns, does not matter, it is not necessary to
know that):
atrox, biplex, carnifex, dendex, fallax, felix, praecox, senex, velox
abundans, albescens, ascendens, caerulans, caeulescens, canescens,
distans, elegans, flavescens, fulvescens, nigricans, nitens, pallens,
pubescens, ringens, rufescens, sapiens, virens, volans

-ior, -ior, -ius. Adjectives in the comparative form, with two endings. Only 0.3 % of the zoological names. The most important are maior and minor, only few know that in neuter gender they must turn to maius and minus.
Examples:
major, major, majus
maior, maior, maius
minor, minor, minus

minutior, minutior, minutius
depressior, depressior, depressius
grandior, grandior, grandius
angustior, angustior, angustius
More: arctior, convexior, crassior, distinctior, elatior, gracilior,
junior, laevior, latior, obscurior, pallidior, scabrior, solidior, tenuior

Incorrect gender application in the original description

Incorrect application of gender in the original description (adjectival name of species did not agree in gender with the genus) should be maintained for citing the original combination. But it is corrected if a name is actually used for a taxon in a current classification, regardless if in the same or in another genus.
Examples:

Some authors forced the specific names to agree in gender with the subgenus and not with the genus. This is no problem. Today the species must agree in gender with the genus. The subgenus can have a different gender.
Examples: