1-treme
monoaperturate
prototherian
ant-eater
duck-billed platypus
duckbill
duckbilled platypus
echidna
ornithorhynchus anatinus
platypus
spiny anteater
Monotremata
anatreme
catatreme
monotrematic
nomotreme
pantotreme
trema
zonotreme
atreme
bitreme
hexatreme
pentatreme
tetratreme
tritreme