Synapsida [a] is a diverse group of tetrapod vertebrates that includes all mammals and their extinct relatives. It is one of the two major clades of the group Amniota, the other being the more diverse group Sauropsida (which includes all extant reptiles and birds).

Introduction to the Synapsida. Much more than mammals! The mammals of today are but one branch of the Synapsida, a great vertebrate group with a 300 million year history.

Note: in evolutionary terms, the mammals are entirely within the Synapsida. Their status as a separate class is traditional Linnaean taxonomy: as a clade they are a sub-group of the Therapsida. Series Amniota. Class †SYNAPSIDA * Order †Pelycosauria * Suborder †Caseasauria; Suborder †Eupelycosauria * Order †Therapsida * Suborder ...

…therapsids, members of the subclass Synapsida (sometimes called the mammal-like reptiles), generally were unimpressive in relation to other reptiles of their time. Synapsids were present in the Carboniferous Period (about 359 million to 299 million years ago) and are one of the earliest known reptilian groups.

2023年5月16日 · A synapsid refers to any animal belonging to the clade group Synapsida. Synapsids are believed to have descended from the earliest amniotes. Their front teeth are distinct from their back teeth, they have limbs under the body, and they have a temporal fenestra (the temporal aperture on the sides of the skull).

2016年8月18日 · (c) Diapsid Skull: Perhaps the most famous diapsids are the dinosaurs, but diapsid also covers snakes, crocodiles, lizards and birds.There are two temporal fenestrae behind the orbit. One is inferior (smaller) and one superior (bigger). (d) Euryapsid Skull: This is probably the least known of the amniote skull.Although it appears to be similar to the synapsid skull it …

2023年8月6日 · Synapsida: Mammals and their extinct relatives. The Tree of Life Web Project. Retrieved from: http://tolweb.org/Synapsida/14845; Naish, D. (2020). Mother Mammals: A Brief Introduction. Retrieved from: https://blogs.scientificamerican.com/tetrapod-zoology/the-stem-mammals-a-brief-primer/

In traditional taxonomy, the Synapsida encompasses two distinct grades successively closer to mammals: the low-slung pelycosaurs have given rise to the more erect therapsids, who in their turn have given rise to the mammals.

Synapsida (=Theropsida) Evolution. The Theropsids or "beast (mammal) faces" constitute an evolutionary lineage that developed a special opening, the synapsid arch, for attachment of jaw muscles, giving a superior bite and permitting adaptive radiation during the late Carboniferous.

Page: Tree of Life Synapsida. Mammals and their extinct relatives. Authored by Michel Laurin and Robert R. Reisz. The TEXT of this page is licensed under the Creative Commons Attribution License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for ...