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来自维基百科,自由的百科全书
背楯亞目(學名:Notaspidea),原作背楯目,是海蛞蝓的一個人工分類群組,現時已經被分成兩個互不相關的群組:傘螺目及側鰓目(Pleurobranchmorpha)[1]。從2018年起,本分類被認為是裸側類支序之下的側鰓目(Pleurobranchida)的異名[1]。
此條目目前正依照其他維基百科上的內容進行翻譯。 (2018年4月4日) |
本分類原最初由1883年由法國動物學家保羅·亨利·費舍爾設置,當時包括側鰓海牛屬(Pleurobranchus)及傘螺屬(Umbrella)兩屬,並歸類於覆鰓類(Tectibranchiata)之中[2]。4
背楯類物種包括有海蛞蝓和一種被稱為「假笠貝」的海洋腹足綱軟體動物的分類,直腹足亞綱後生腹足下綱後鰓目的成員。然而,在較新的2005年布歇特和洛克羅伊的腹足類分類,the families Umbraculidae and Tylodinidae belong to the superfamily Umbraculoidea Dall, 1889, part of the clade Umbraculida. Grande et al. (2004) found Umbraculoidea to be a sister clade to the Cephalaspidea (Acteonoidea excluded).[3]
The families Tylodinidae and Umbraculidae have large limpet-like external shells and a small mantle, while the species in the family Pleurobranchidae have a prominent mantle and an internal shell that becomes reduced or is lost in adults.[4] Many species produce mantle secretions as a chemical defense against predators [5]
由於側鰓科與傘螺科並不具單系性,因此兩後來被拆分,本分類元也於被處理為側鰓目(Pleurobranchida)的同物異名[2]。
本亞目包括下列三個科:
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