海牛下目

海牛下目（学名：Doridoidei；旧作Doridacea）是裸鳃目海牛亚目之下的一个下目级分类单元，皆为没有螺壳的海洋腹足纲软体动物^[1]。

型态描述

The outer mantle bears caryophyllidia or sensory tubercles, surrounded by spicules.

在2005年的布歇特和洛克罗伊的腹足类分类，现在的海牛下目在当时只是有角鳃类海牛亚目之下的一个亚支序，包括下列四个总科与科^[2]。

海牛总科 Doridoidea Rafinesque, 1815
- Family Dorididae
- Family Actinocyclidae
- 多彩海麒麟科 Chromodorididae^[3]
- Family Discodorididae
Superfamily Onchidoridoidea Gray, 1827（= Phanerobranchiata Suctoria）
- Family Onchidorididae
- Family Corambidae
- Family Goniodorididae
叶海牛总科 Phyllidioidea Rafinesque, 1814^[4]
- 枝鳃海麒麟科^[3] Dendrodorididae O'Donoghue, 1924 (1864)
- Family Mandeliidae Valdés & Gosliner, 1999
- 叶海牛科 Phyllidiidae Rafinesque, 1814
多角总科 Polyceroidea Alder & Hancock, 1845（= Phanerobranchiata Non Suctoria）
- 多角海牛科 Polyceridae Alder & Hancock, 1845 (= Phanerobranchiata Non Suctoria)，又名多角海麒麟科^[3]或多角海蛞蝓科。
- Family Aegiretidae - Aegiretidae is incorrect subsequent spelling of this family in Bouchet & Rocroi (2005). Correct is Aegiridae.
- Family Gymnodorididae
- 六鳃海麒麟科 Hexabranchidae^[3]
- 优美海麒麟科 Okadaiidae

在2017年的布歇特等人的腹足类分类，海牛下目及其所属的海牛亚目改为直接隶属裸鳃目^[5]^[1]。

截至2018年5月2日 (2018-05-02)^[update]，本下目包括下列四个总科^[1]：

海牛总科 Doridoidea Rafinesque, 1815
- Family Actinocyclidae O'Donoghue, 1929
- Family Cadlinidae Bergh, 1891
- 多彩海麒麟科 Chromodorididae Bergh, 1891^[3]
- Family Discodorididae Bergh, 1891
- Family Dorididae Rafinesque, 1815
- Subfamily Miamirinae Bergh, 1891
Superfamily Onchidoridoidea Gray, 1827（= Phanerobranchiata Suctoria）
- Family Akiodorididae Millen & Martynov, 2005
- Family Calycidorididae Roginskaya, 1972
- Family Corambidae Bergh, 1871
- Family Goniodorididae H. Adams & A. Adams, 1854
- Family Onchidorididae Gray, 1827
叶海牛总科 Phyllidioidea Rafinesque, 1814^[4]
- 枝鳃海麒麟科^[3] Dendrodorididae O'Donoghue, 1924 (1864)
- Family Mandeliidae Valdés & Gosliner, 1999
- 叶海牛科 Phyllidiidae Rafinesque, 1814
多角总科 Polyceroidea Alder & Hancock, 1845（= Phanerobranchiata Non Suctoria）
- Family Aegiridae
- 六鳃海麒麟科 Hexabranchidae^[3]
- 优美海麒麟科 Okadaiidae
- 多角海牛科 Polyceridae Alder & Hancock, 1845：又名多角海麒麟科^[3])，并入了Gymnodorididae Odhner, 1941。

Superfamily Onchidoridacea accepted as Onchidoridoidea Gray, 1827 (suffix -oidea mandatory for a superfamily name following current ICZN art. 29.2.)
Superfamily Porodoridacea Odhner, 1968 accepted as Phyllidioidea Rafinesque, 1814
Superfamily Porostomata Bergh, 1876 accepted as Phyllidioidea Rafinesque, 1814

^ ^1.0 ^1.1 ^1.2 ^1.3 Bouchet, Philippe; Gofas, Serge. Doridoidei. WoRMS. 2018-01-29 [2018-05-02].
^ Bouchet, P.; Rocroi, J.-P.; Frýda, J.; Hausdorf, B.; Ponder, W.; Valdés, Á. & Warén, A. Classification and nomenclator of gastropod families. Malacologia (Hackenheim, Germany: ConchBooks). 2005, 47 (1–2): 1–397. ISBN 3-925919-72-4. OCLC 61351079. OL 42989175M. S2CID 83847814.
^ ^3.0 ^3.1 ^3.2 ^3.3 ^3.4 ^3.5 ^3.6 ^3.7 谭天锡; 白振宇; 夏国经. 台灣沿海產裸鰓目軟體動物相的分布調查. 贝类学报 (中华民国贝类学会). 1987, 13: 71–90 （中文（繁体））.
^ ^4.0 ^4.1 Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O (编). Phyllidioidea Rafinesque, 1814. MolluscaBase. [2018-05-16] –通过WoRMS.
^ Bouchet, P.; Rocroi, J.-P.; Hausdorf, B.; Kaim, A.; Kano, Y.; Nützel, A.; Parkhaev, P.; Schrödl, M.; Strong, E.E. Revised Classification, Nomenclator and Typification of Gastropod and Monoplacophoran Families. Malacologia. 2017, 61 (1–2): 1–526. OCLC 7296100651. S2CID 91051256. doi:10.4002/040.061.0201.