''Caseopsis'' is an extinct genus of large

pelycosaur Pelycosaur ( ) is an older term for basal or primitive Late Paleozoic synapsids, excluding the therapsids and their descendants. Previously, the term ''mammal-like reptile'' had been used, and pelycosaur was considered an order, but this is no ...

s that was about long. ''Caseopsis'' lived in the late Early

Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleoz ...

epoch (

Kungurian In the geologic timescale, the Kungurian is an age or stage of the Permian. It is the latest or upper of four subdivisions of the Cisuralian Epoch or Series. The Kungurian lasted between and million years ago (Ma). It was preceded by the Artin ...

Age), before the pelycosaurs were replaced by the more advanced

therapsid Therapsida is a major group of eupelycosaurian synapsids that includes mammals, their ancestors and relatives. Many of the traits today seen as unique to mammals had their origin within early therapsids, including limbs that were oriented more ...

s (in the next age). It was a lightly built, agile creature. It may have been possible for this species to outpace and escape large predators such as ''

Dimetrodon ''Dimetrodon'' ( or ,) meaning "two measures of teeth,” is an extinct genus of non-mammalian synapsid that lived during the Cisuralian (Early Permian), around 295–272 million years ago (Mya). It is a member of the family Sphenacodontid ...

''.

References

Kungurian life
Caseasaurs Prehistoric synapsid genera Cisuralian synapsids of North America Taxa named by Everett C. Olson Fossil taxa described in 1962 Kungurian genus first appearances Kungurian genus extinctions {{Paleo-synapsid-stub

See also

References