protorosaurian
/ˌprəʊt(ə)rə(ʊ)ˈsɔːrɪən/Palaeontology
adjective
Of, relating to, or designating fossil reptiles of the genus Protorosaurus and their allies; specifically belonging to the order Protorosauria.
noun
= protorosaur rare.
Origin
Late 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From scientific Latin Protorosaurus (or Proterosaurus) Protorosaurus + -ian, after scientific Latin Protorosauria (or Proterosauria), order name.