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Occithrissops
''Occithrissops'' is an extinct genus of prehistoric bony fish of the Jurassic, known for its fearsome yet small appearance. The genus name of ''Occithrissops'' derives from the Latin word "Occi" (killing) and the Greek words "thriss" (fish) and "ṓps" (“face”). Similar in relationship to the Thrissops, it was a slightly larger predatory teleost fish with serrated pelvic fins, a cleft tail, and a bony tongue similar to the Arapaima and formerly mentioned Thrissops, bearing small teeth for catching small slippery prey like squid, invertebrates and fish. The bony tongue assisted the fish in consuming hard shelled invertebrates which included small nektonic Jurassic ammonites, which despite the growing decline of ammonoids were still prevalent and plentiful for their time.〔http://www.britannica.com/EBchecked/topic/308541/Jurassic-Period/257898/Protists-and-invertebrates ©2014 Brittanica Retrieved: September 19, 2014〕
==Appearance==
''Occithrissops'' skulls and spines shared similarities to modern day osteoglossiformes. It had a thick skull and cleft pectoral fins, a body shape built towards fast pursuit in marine environments as opposed to the living osteoglossiforms which have elongated fins more suited to maneuvering in heavily obstructed rivers.〔http://www.helsinki.fi/~mhaaramo/metazoa/deuterostoma/chordata/actinopterygii/osteoglossomorpha/osteoglossomorpha.html Osteoglossiformes Phylogeny Jurassic〕 They were a anadromous species, a term which comes from the Greek anadromos, meaning "running upward". They would migrate into fresh-water to spawn, albeit not as successfully as other anadromous species, as ''Occithrissops'' and other open-ocean osteoglossiformes did not survive the Triassic-Jurassic extinction event, while other members retreated to Gondwana rivers before the continent broke up.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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