|
〕 (Matthew, 1899) ( ''H. cecrops'' Walcott) |H. reesei| Babcock & Robison 1988 (type)}} }} ''Haplophrentis'' was a tiny shelled hyolithid which lived in the Cambrian Period. Its shell was long and conical, with the open end protected by an operculum, from which two fleshy arms called ''helens'' protruded at the sides. These arms probably acted as stabilisers, or were used for locomotion, rowing the animal across undersea mudflats. == Morphology == ''Haplophrentis'' ranged in length between 2–6 cm. It is distinguished from ''Hyolithes'' by the presence of a longitudinal septum on the middle of the inner surface of the top of the shell.〔 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「Haplophrentis」の詳細全文を読む スポンサード リンク
|