對菊石(學名:Bifericeras),又名畢佛菊石,是生存於侏羅紀早期的一屬菊石,生活在深度適中的海域,以小型無脊椎動物或屍體為食。如同其他菊石,殼體較大的對菊石為雌性,殼體較小的對菊石則為雄性,較大的體型有利於雌性菊石的產卵及孵化。[1]其化石僅被發現於英格蘭薩默塞特郡的凱里堡。[2]國際地層委員會將Apoderoceras屬化石和本屬下Bifericeras donovani化石的始現面訂為侏羅紀普連斯巴奇期開始的標誌。
物種[2]
- Bifericeras annulosum
- Bifericeras bifer
- Bifericeras curvicosta
- Bifericeras juengsti
- Bifericeras nudicosta
- Bifericeras reclinatum
- Bifericeras serpentinum
- Bifericeras soelli
- Bifericeras subplanicosta
- Bifericeras vitreum
參考文獻
外部連結
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