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).

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).

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.

…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.

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 ...

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 …

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.

2020年9月30日 · Synapsida comprises mammals and all extinct taxa more closely related to mammals than to reptiles including birds. Synapsids form a distinct evolutionary lineage from reptiles. There was a gradual evolutionary acquisition of mammal-like …

In the phylogenetic system, the Synapsida include Mammalia and all other amniotes more closely related to Mammalia than to Reptilia. The most characteristic feature is the presence of a sin-gle large opening behind the orbit on either side of the skull. This opening is small in basal synapsids but increases in size in later, more

Book Title: Early Evolutionary History of the Synapsida. Editors: Christian F. Kammerer, Kenneth D. Angielczyk, Jörg Fröbisch. Series Title: Vertebrate Paleobiology and Paleoanthropology. DOI: https://doi.org/10.1007/978-94-007-6841-3. Publisher: Springer Dordrecht. eBook Packages: Earth and Environmental Science, Earth and Environmental ...