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Kosmoceras jason : ウィキペディア英語版 | Kosmoceras jason
''Kosmoceras jason'' is an ammonite species from the Callovian (Middle Jurassic), lasting between 154 and 160 Ma. 〔 (Ammonites ) 〕 ==Description== ''Kosmoceras jason'' has a shell that reaches a size of about 10 cm. These ammonites have a very compressed section and a narrow umbilicus on phragmocone. Ornamentation is fine and dense.〔 This species is characterized by sexual dimorphism, with macroconch (large shell) in females and microconch (small shell) in males. 〔Joe Shimmin (An Introduction to Ammonites ) 〕
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