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背楯亚目（学名：Notaspidea），原作背楯目，是海蛞蝓的一个人工分类群组，现时已经被分成两个互不相关的群组：伞螺目及侧鳃目（Pleurobranchmorpha）[1]。从2018年起，本分类被认为是裸侧类支序之下的侧鳃目（Pleurobranchida）的异名[1]。
 | 此条目目前正依照其他维基百科上的内容进行翻译。 (2018年4月4日) |
本分类原最初由1883年由法国动物学家保罗·亨利·费舍尔设置，当时包括侧鳃海牛属（Pleurobranchus）及伞螺属（Umbrella）两属，并归类于覆鳃类（Tectibranchiata）之中[2]。4
背楯类物种包括有海蛞蝓和一种被称为“假笠贝”的海洋腹足纲软体动物的分类，直腹足亚纲后生腹足下纲后鳃目的成员。然而，在较新的2005年布歇特和洛克罗伊的腹足类分类，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]
由于侧鳃科与伞螺科并不具单系性，因此两后来被拆分，本分类元也于被处理为侧鳃目（Pleurobranchida）的同物异名[2]。
本亚目包括下列三个科：
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