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Temporal range: Early Permian
Casea FMNH.jpg
C. broilii skeleton in the Field Museum of Natural History
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Clade: Caseasauria
Family: Caseidae
Genus: Casea
Williston, 1910
Type species
Casea broilii
Williston, 1910
Other species
  • C. halselli Olson, 1954
  • C. nicholsi Olson, 1954

Casea is an extinct genus of pelycosaur synapsids which was about 1.2 metres (4 ft) long from Texas, United States and Aveyron, France. It was slightly smaller than the otherwise very similar Caseoides. Casea was one of the first amniote herbivores, sharing its world with animals such as Dimetrodon and Eryops. It was possibly also aquatic.[1]


Size relative to a human
C. broilii restoration

Casea had a heavy, round body and a small skull. Its rib cage was greatly expanded, presumably to make space for a large, plant-fermening gut as well as proportionally large lungs. Like other caseids, it lacked teeth in its lower jaw, and had blunt teeth in the upper jaw. These adaptations indicate that Casea was a herbivore, feeding on relatively tough plants, such as ferns.[2] Like most derived caseids it had paddle-like limbs and osteoporotic bones, indicating adaptations for an aquatic lifestyle.[3]

See also[edit]


  1. ^ Lambertz, M.; Shelton, C.D.; Spindler, F.; Perry, S.F. (2016). "A caseian point for the evolution of a diaphragm homologue among the earliest synapsids". Annals of the New York Academy of Sciences. doi:10.1111/nyas.13264.
  2. ^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 188. ISBN 1-84028-152-9.
  3. ^ Markus Lambertz et al, A caseian point for the evolution of a diaphragm homologue among the earliest synapsids, Annals of the New York Academy of Sciences (2016). DOI: 10.1111/nyas.13264