Monotremes retain a reptile-like gait, with legs on the sides of, rather than underneath, their bodies. The monotreme leg bears a spur in the ankle region; the spur is not functional in echidnas, but contains a powerful venom in the male platypus. This venom is derived from b-defensins, proteins that are present in mammals that create holes in.
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Monotremes are a group of mammals that form the order Monotremata. Monotremes are the only mammals that lay eggs, but they also feed their babies with milk. The word 'monotreme' refers to their common rear opening, the cloaca.In amphibia, reptiles, birds and probably all early tetrapods, there is a common opening for urine, reproduction and faeces.
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Monotreme definition, any animal of the Monotremata, the most primitive order of mammals, characterized by certain birdlike and reptilian features, as hatching young from eggs, and having a single opening for the digestive, urinary, and genital organs, comprising only the duckbill and the echidnas of Australia and New Guinea. See more.
Monotremata: Systematics: Monotremes are mammals. Unlike other mammals monotremes lay eggs, as did the ancestors of the mammals. For this reason, the Monotremata are considered the sister group to all other mammals. Living monotremes are classified in two families, the Ornithorhynchidae (platypus family) and the Tachyglossidae (echidnas). A.
The name Monotremata means “one-holed.” This refers to the fact that, like reptiles and birds, both sexes have only one opening at the rear of the body, which is used for both reproduction and excretion. Monotreme eggs are protected by a soft, leathery shell, like the eggs of reptiles. In both kinds of monotreme, the young break from the.
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Peter Holz, in Fowler's Zoo and Wild Animal Medicine, Volume 8, 2015. Biology Taxonomy. The order Monotremata is unique among mammals, as its members lay shell-covered eggs but nurse their young. The two families in this order are Tachyglossidae, which includes the echidnas, and Ornithorhynchidae, which includes the single species of platypus (Ornithorhynchus anatinus).