臀頭蝦類(Pygocephalomorphs)是一類已滅絕的原始蝦類,在分類學上屬於囊蝦總目臀頭蝦目(Pygocephalomorpha),是甲殼亞門軟甲綱真軟甲亞綱的原始代表。例如:蒂里奧蝦、巢蝦等。[1]
特徵
臀頭蝦類的主要特徵是:在原足(protopod)上具有單節雙叉型的胸節附肢(biramous thoracic appendage),尾部具有叉葉(furcallobe)和中關節刺(median articulated spine);殼瓣兩側鰓蓋發育,頭胸部和腹部近等長或腹部變小(Brooks,1969)。[1]
分布
臀頭蝦類的化石僅發現於晚古生代地層,以石炭紀、二疊紀為多。[2]臀頭蝦類分布比較廣泛,在歐洲、美洲、非洲和亞洲等地都有發現(Brooks,1962;Schram,1980,1981)。[1]
分類
- Notocarididae
- Pygocephalidae
- 蒂里奧蝦科 Tealliocarididae
- Tylocarididae
- Pygaspis
參考文獻
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