Montecaris is a genus of extinct phyllocarid crustaceans found in the Upper Devonian of Europe, Canada, and Australia. Description Montecaris possesses an unornamented, bivalved carapace which terminates in a spiny posterior. It's caudal tail fin is trifurcated and dagger-like. Species of Montecaris from Europe and Canada are no more than in length, while M. gogoensis from the Gogo Formation of Australia can reach lengths of and, rarely, up to . Due to its streamlined carapace and large tail fin, Montecaris was likely an active nektonic swimmer, which primarily appears in deep water sediments. Its robust mandibles and powerful musculature suggests a carnivorous lifestyle as an active predator or scavenger. Species M. antecedens Chlupač, 1960 M. brunnensis Chlupač, 1960 M. gogoensis Briggs, 2011 M. lehmanni Jux, 1960 (Possibly synonymous with M. strunensis) M. strunensis Jux, 1959 M. tatarica Krestovnikov, 1961 References Prehistoric Malacostraca Prehistoric crustacean genera Devonian arthropods Devonian animals Fossils of Australia Fossils of Canada Fossils of Germany