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槳足綱

槳足綱
化石时期:賓夕法尼亞紀至現代
科学分类 编辑
界: 动物界 Animalia
门: 节肢动物门 Arthropoda
亚门: 甲殼亞門 Crustacea
纲: 槳足綱 Remipedia

见正文

槳足綱(學名:Remipedia)是分布於濱海地下含水層中的甲殼亞門動物,不具視力,族群遍布在目前已知的海盆,如加勒比海大西洋澳洲海域,最早發現的槳足綱為賓夕法尼亞紀的化石,不過自1979年已在新熱帶界發現17種現存槳足綱動物。[1]

槳足綱的分佈:(A)加勒比海(B)加那利群島(C)西澳州

特徵

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槳足綱動物身長10到40毫米,包含頭和極長的軀幹,體節至多可達42節[2],每節都有可游泳的附肢,以背側朝下游泳,大部分種類移動速度較緩。牙上連接分泌腺體,不過科學家仍不清楚分泌物為消化液還是毒液,也不確定其主食為死亡生物碎屑或者活體。而在Xibalbanus tulumensis這個物種已知會分泌毒素。槳足綱的身體結構在甲殼亞門中屬原始者,有人認為此綱可能為原始族群,但Fanenbruck et al.指出槳足綱中至少有其中一種Godzilliognomus frondosus,具有高度組織和完善分隔的腦,且嗅覺區佔了大塊,為黑暗棲地中與其他多種生物的共通特徵。[3]

下属分类

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本纲包括以下目:

參考資料

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  1. ^ Stefan Koenemann, Frederick R. Schram, Mario Hönemann, & Thomas M. Iliffe. Phylogenetic analysis of Remipedia (Crustacea) 7 (1): 33–51. 2007. doi:10.1016/j.ode.2006.07.001. 
  2. ^ Cameron McCormick. Remipedia. The Lord Geekington. November 10, 2008 [2014-07-18]. (原始内容存档于2009-10-03). 
  3. ^ Martin Fanenbruck, Steffen Harzsch & Johann Wolfgang Wägele. The brain of the Remipedia (Crustacea) and an alternative hypothesis on their phylogenetic relationships. Proceedings of the National Academy of Sciences. 2004, 101 (11): 3868–3873. doi:10.1073/pnas.0306212101. 
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槳足綱
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