monotremes In A Sentence
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- The short-beaked echidna is the only member of its genus, sharing the family Ornithorhynchidae, they are the only extant monotremes in the world.
- The monotremes have a sex determination system different from that of most other mammals.
- Phylogenetically, Mammalia is defined as all descendants of the most recent common ancestor of monotremes ( e . g ., echidnas and platypuses ) and therian mammals ( marsupials and placentals ).
- The zygotes of monotremes, however, undergo meroblastic division ( as in birds and reptiles ), which causes the ovum to split but not completely.
- Marsupials ( and monotremes ) also lack a gross communication ( corpus callosum ) between the right and left brain hemispheres.
- "' monotremes "'are basal mammals that lay eggs ( Prototheria ) instead of giving birth to live young like marsupials ( Metatheria ) and placental mammals ( Eutheria ).
- Finding a fossil monotreme in Argentina suggested that monotremes once occurred across Gondwanaland (Antartica, Australia and South America ).
- Prototheria means'first beasts', a reference to the fact that monotremes were the first mammals and the closest to mammals'reptilian ancestors.
- There is cytological evidence that the low metabolism of monotremes is a secondarily evolved trait.
- Unlike modern placental mammals, " Zalambdalestes " had an epipubic bone, meaning it was probably restricted reproductively in the same way as modern monotremes and marsupials.
- Its species include tree kangaroos and two types of egg-laying mammals, or monotremes.
- Its eggs were probably small and leathery, a condition still found in monotremes.
- However, the presence of epipubic bones suggests that, like marsupials and monotremes ( as well as most other non-placental mammals ), they instead gave birth to larval young.
- The monotremes are the only group of land mammals known to have evolved electroreception.
- For example, all gargoyle females lay eggs just as monotremes do.
- Among the monotremes, the duck-billed platypus ( " Ornithorhynchus anatinus " ) has the most acute electric sense.
- Monotremes, egg-laying mammals, lay soft-shelled eggs similar to those of reptiles.
- Monotremes (2 species) and marsupials (4 families and 44 species) predominate, but are not abundant.
- Instead, they excluded monotremes from Australosphenida and placed the remaining australosphenidans close to Eutheria, with " Ambondro " most closely related to " Asfaltomylos ".
- Haacke is remembered for research of oviparity in monotremes, and studies involving the morphology of jellyfish and corals.
- From 1909 to 1915 he carried out fieldwork at the extinct monotremes and marsupials in the Pleistocene limestone there.
- But much of what biologists surmised about monotremes over the years has turned out to be wrong.
- I also now consider marsupials and monotremes to be the Devil's own Beasts of Hell.
- All extant eutherians lack epipubic bones, which are present in all other living mammals ( marsupials and monotremes ).
- Modern monotremes have a low body temperature compared to marsupials and placental mammals, around.
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