monotremata
Noun
Meaning
A subclass of Mammalia, having a cloaca in which the ducts of the urinary, genital, and alimentary systems terminate, as in birds. The female lays eggs like a bird. See Duck mole, under Duck, and Echidna.
Source: Webster's dictionarySynonyms
order Monotremata
platypus
duckbill
billfish
mud puppy
duck-billed platypus
water mole
egg-laying mammal
Ornithorhynchus anatinus
spur-winged goose
duckmole
platypoda
beak-billed platypus
river duck
duckbill platypus
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Examples
They only occur on about 20% of all placentalian mammal species, and are unknown from several orders of mammals (Monotremata, Edentata, Pholidota, Chiroptera, Cetacea, Sirenia and Proboscidea).