|
Liparoceratidae is a family of eoderoceratacean ammonites from the Lower Jurassic that combines genera with a variety of forms including dimorphs that change from one form to another during ontogeny. Three genera and six subgenera are included in the Liparoceridae according to D.T. Donovan in Donovan ''et al.'' 1981; ''Liparoceras'' including ''L''. (''Liparoceras''), ''L''. (''Becheiceras''), and ''L''. (''Vicininodiceras''); ''Aegoceras'' including ''A''. (''Aegoceras''), ''A''. (''Beaniceras''), and ''A''. (''Oistoceras''); and ''Androgynoceras''. Arkell, ''et al.'' (1957) in the Treatise on Invertebrate Paleontology, Part L list ''Liparoceras'' with ''Becheiceras'' and ''Vincininodiceras'' along with ''Parinodiceras'' separately as subgenera; ''Beaniceras'', ''Metacymbites'', ''Oistoceras'', and ''Platynoticeras'' but leave out ''Aegoceras''. ''Parinodiceras'' and its equivalent, ''Platynoticeras'' are removed (Donovan 1981) to the Polymorphitidae. ''Metacymbites'' is a smooth dwarf and may form a dimorphic pair with ''Liparoceras''. The Liparoceratidae are thought to have evolved from the Eoderoceratidae along with the Coeloceratidae and Polymorphidae close to the same time during the Sinemurian stage of the Early Jurassic, and in the following Pliensbachian gave rise to the Amaltheidae. ==References== *Arkell, ''et al.'', 1957. Mesozoic Ammonoidea, in Treatise on Invertebrate Paleontology, (Part L); Geological Soc. of America and University of Kansas press. *Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association. () 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Liparoceratidae」の詳細全文を読む スポンサード リンク
|