Protremaster is an extinct genus of sea stars that lived in the Early Jurassic (age range: 196.5 to 189.6 Ma). Its fossils have been found in the Lully Foothills Formation of Antarctica.: A. B. Smith and T.H. Tranter. 1985. Protremaster, a new lower jurassic genus of asteroid from Antarctica. Geological Magazine 122(4):351-359
References
External links in the Paleobiology Database