monotreme


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Related to monotreme: placental mammal

mon·o·treme

(mon'ō-trēm),
A member of the order Monotremata.

monotreme

(mŏn′ə-trēm′)
n.
Any of various egg-laying mammals of the order Monotremata of Australia and New Guinea, whose only living members are the platypus and the echidnas.

mon′o·trem′a·tous (-trĕm′ə-təs) adj.

monotreme

any mammal of the primitive subclass Monotremata, including the duck-billed platypus and spiny anteater. Monotremes differ from other mammals in laying eggs, and in having a single opening (CLOACA) for the passage of eggs or sperm, faeces and urine. They inhabit Australia and New Guinea.

monotreme

a member of the animal order of Momotremata, the egg-laying mammals. Includes only two species, the duck-billed platypus and the spiny anteater.
References in periodicals archive ?
Of the 17 major groups of mammals, Australia has only five native groups: monotremes, marsupials, bats, rodents, and seals.
In the case of the INSL3 ancestor, the duplication fluke occurred sometime before the monotremes, marsupials and placental mammals split, but after fish and frogs became separate groups.
Far more numerous than the primitive monotremes are the marsupials (mar soo'pee elz), which include pouched mammals like the kangaroos, koalas, and wombats.
Monotremes are a unique group of animals made up of the echidna and the platypus.
Monotremes produce milk for their young but lack nipples, so their milk just oozes out of mammary gland ducts and collects in grooves on patches of skin, where the nursing babies lap it up or suck it from tufts of fur.
If the tree was correct, the molar thought to belong exclusively to live-bearing mammals had evolved separately in the egg-laying monotremes.
Females also have a joint urinary and genital tract, a characteristic shared with primitive mammals such as the monotremes of Australia.
Those fur coats and their ability to produce milk would make them mammals, but they also lay eggs, making them officially monotremes, a distinction they share only with the platypus.
45) For the platypus' eggs and marsupial reproduction see Kathleen Garnette Dugan, 'Marsupials and Monotremes in Pre-Darwinian Theory', PhD thesis, University of Kansas, 1980.
They placed the platypus in a special group of mammals, the monotremes ("one-opening" animals).
20 species of mammals declared extinct, with almost half of Australia's marsupials and monotremes listed as extinct, endangered or vulnerable.