The Class Synapsida is a member of the Series Amniota. Here is the complete "parentage" of Synapsida:
- Domain: Eukaryota
Whittaker & Margulis,1978 - eukaryotes
- Kingdom: Animalia
C. Linnaeus, 1758 - animals
- Subkingdom: Bilateria
(Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians
- Branch: Deuterostomia Grobben, 1908 - Deuterostomes
- Subkingdom: Bilateria (Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians
- Kingdom: Animalia C. Linnaeus, 1758 - animals
The Class Synapsida is further organized into finer groupings including:
- Subclass (1): Theriiformes
- Infraclass (1): Holotheria
- Superlegion (1): Trechnotheria
- Order (2): Pelycosauria · Therapsida
- Species: ZipcodeZoo has pages for 4 species and subspecies in the Class Synapsida.
Therapsida is a group of the most advanced synapsids, and include the ancestors of mammals. Many of the traits today seen as unique to mammals had their origin within early therapsids, including hair, lactation, and an erect posture. The earliest fossil attributed to Therapsida is believed to be Tetraceratops insignis (Lower Permian). Therapsids evolved from 'pelycosaurs' (specifically sphenacodonts) 275 million years ago. They replaced the pelycosaurs as the dominant large land animals in the Middle Permian. They remained the dominant fauna until replaced by archosaurs and rhynchosaurs in the Middle Triassic although some therapsids, the kannemeyeriiforms for example, remained diverse in the Late Triassic. The therapsids included the cynodonts, the group that gave rise to mammals in the Late Triassic around 225 million years ago. Of the non-mammalian therapsids, only cynodonts and dicynodonts survived the Triassic?Jurassic extinction event. The last of the non-mammalian therapsids, the cynodont tritylodontids, became extinct in the Early Cretaceous, approximately 100 million years ago. [more]
At least 1,057 species and subspecies belong to the Order Therapsida.
More info about the Order Therapsida may be found here.
- The text on this page is licensed under the GNU Free Documentation License.
- Photographs on this page are copyrighted by individual photographers, and individual copyrights apply.
- The technology underlying this page, including the controls behind Keep Exploring, is owned by the BayScience Foundation. All rights are reserved.