馬蹄菊石(學名:Hildoceras)是生存在早至中侏羅世大陸棚海域中的一屬菊石,游水能力一般。[1]其化石分佈於歐洲和突尼斯等地。[2]
特徵
馬蹄菊石具有反旋的、邊緣緊縮的殼,側面有被凹槽切斷、很粗糙、間距很大的鐮刀狀肋條。縫合線很複雜。線條突出分明的長方形殼階部分有三條低矮的、被二條凹橫分開的腹稜,殼階位於腹上。[1]
物種[2]
- Hildoceras (Lillia)
- Hildoceras ameuri
- Hildoceras apertum
- Hildoceras bastiani
- Hildoceras bifrons
- Hildoceras caterinii
- Hildoceras crassa
- Hildoceras crassum
- Hildoceras graecum
- Hildoceras laticosta
- Hildoceras lusitanicum
- Hildoceras semipolitum
- Hildoceras sublevisoni
- Hildoceras tethysi
參考文獻
參考書目
外部連結
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