裸鰓類

裸鰓目（學名：）是原來裸鰓亞目下的軟體動物。牠們身體柔軟、沒有外殼及棲於水中，其顏色非常鮮艷。裸鰓類原是後鰓目之下的一個亞目級分類，2005年《布歇特和洛克羅伊的腹足類分類》將裸鰓亞目改為異鰓類支序之下的不分等支序，但到了2017年《布歇特等人的腹足類分類》又再改為目級分類單元。

裸鰓類有時會被簡單的稱為，但海蛞蝓卻包含了多類不同及相距很遠的動物。一些海蛞蝓也像裸鰓類般色彩鮮艷，很容易造成混淆。

雖然同為腹足綱軟體動物，但一般的貝類分類學圖鑑都不包括裸鰓類物種。

分佈及棲息地
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裸鰓類分佈在全球的海洋。牠們可以在鹹水環境生活，但在溫暖及淺水區可以生長到最大的體型。

特徵
裸鰓類的身體形態可以有很大不同，但都是兩側對稱的。牠們沒有外套腔。成年的裸鰓類長2-60厘米，沒有外殼或蓋。

裸鰓類的眼睛構造簡單，只能分辨光與暗

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外部連結
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• [https://web.archive.org/web/20100328164757/http://nudibranch.com.au/ Lots of images and information on Australian nudibranchs]
• [https://web.archive.org/web/20080703171829/http://scubadiving.naroomaonline.com/ Nudibranchs in their natural environment, Scuba Diving - Narooma NSW]
• [http://www.seaslugforum.net/ Sea Slug Forum: many images and much valuable information worldwide]
• [https://web.archive.org/web/20110527123406/http://www.nudipixel.net/ Nudi Pixel: Online resource for nudibranchs and sea slugs identification using photographs]
• [https://web.archive.org/web/20100107002612/http://www.sergeyphoto.com/underwater/nudibranchs.html Nudibranch gallery]
• [https://web.archive.org/web/20070531014134/http://seaslug.com/ Bibliography and portal to opisthobranch, nudibranch & seaslug information]
• [https://web.archive.org/web/20090326104344/http://www.waterworxbali.com/nudibranchs.shtml Nudibranch photo gallery from Bali]
• [http://www.scottishnudibranchs.co.uk/index.html Scottish Nudibranchs: Online resource for identification of species found in Scottish waters]
• [http://www.gmanews.tv/video/21917/Born-to-be-Wild-Sea-Slugs Born to be Wild: Sea Slugs, 04/30/2008]
• http://ngm.nationalgeographic.com/2008/06/nudibranchs/doubilet-photography?email=focus_20080523
• [http://www.seaslugsofhawaii.com/ Sea slugs of Hawaii]