Search results
Results from the WOW.Com Content Network
The class Mammalia is divided into two subclasses based on reproductive techniques: egg-laying mammals (yinotherians or monotremes - see also Australosphenida), and mammals which give live birth . The latter subclass is divided into two infraclasses: pouched mammals ( metatherians or marsupials ), and placental mammals ( eutherians , for which ...
Monotremes (/ ˈ m ɒ n ə t r iː m z /) are mammals of the order Monotremata. They are the only group of living mammals that lay eggs, rather than bearing live young. The extant monotreme species are the platypus and the four species of echidnas. Monotremes are typified by structural differences in their brains, jaws, digestive tract ...
Ornithorhynchoidea is a superfamily of mammals containing the only living monotremes, the platypus and the echidnas, as well as their closest fossil relatives, to the exclusion of more primitive fossil monotremes of uncertain affinity.
This category contains articles about all taxa below the subclass/order Monotremata - the platypus, the echidnas, and extinct species which are only known via fossil evidence. Subcategories This category has the following 5 subcategories, out of 5 total.
This page was last edited on 22 December 2024, at 08:36 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Steropodontids are small monotremes; Steropodon has an estimated body mass of 2 kilograms (4.4 lb), and Parvopalus represents the smallest mammal found in its faunal assemblage. Members of this clade are characterized by having narrow and tall dentaries compared to other monotremes, and a prominent ascending ramus of the dentary. [4]
Prototheria (/ ˌ p r oʊ t ə ˈ θ ɪər i ə,-t oʊ-/, PROH-toh-THEER-ee-ə; [1] from Ancient Greek πρώτος prṓtos "first" and θήρ thēr "wild animal") is an obsolete subclass of mammals which includes the living Monotremata and to which a variety of extinct groups, including Morganucodonta, Docodonta, Triconodonta and Multituberculata, have also been assigned.
Kollikodontidae is an extinct family of early monotreme mammals. Defining characteristics of kollikodontids include very specialized bunodont molars, which may indicate a diet of hard-shelled animals like mollusks in some species, and a somewhat narrow mandibular canal. The known genera have estimated body masses between 3.5–8 kilograms (7.7 ...