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''Bellerophon'' is a genus of extinct paleozoic marine molluscs of uncertain position (Gastropoda or Monoplacophora) in the family Bellerophontidae. The genus was named after Bellerophon, the ancient Greek hero. ''Bellerophon'' is the type genus of the family Bellerophontidae. ==Shell description== The genus is characterised by a shell which is globose, convolute, and planispiral (symmetrically coiled). The shell of ''Bellerophon'' superficially resembles that of a miniature cephalopod (e.g. ''Nautilus'' or an ammonite), except that septa are lacking. The shell of ''Bellerophon'' is often a couple of centimeters in maximum dimension. The external surface is smooth, ornamented only by growth lines. There is a low crest or ridge running along the midline of the shell. Many specimens of ''Bellerophon'' show something resembling a "waterline" about halfway up the shell, suggesting that a large amount of the mantle and foot were exposed and covered the outside of the shell, as in the extant Cypraeidae and Naticidae. 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「Bellerophon (genus)」の詳細全文を読む スポンサード リンク
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