海牛下目

海牛下目（學名：Doridoidei；舊作Doridacea）是裸鰓目海牛亞目之下的一個下目級分類單元，皆為沒有螺殻的海洋腹足綱軟體動物^[1]。

型態描述

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

在2005年的布歇特和洛克羅伊的腹足類分類，現在的海牛下目在當時只是有角鰓類海牛亞目之下的一個亞支序，包括下列四個總科與科^[2]。

海牛總科 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
葉海牛總科 Phyllidioidea Rafinesque, 1814^[4]
- 枝鰓海麒麟科^[3] Dendrodorididae O'Donoghue, 1924 (1864)
- Family Mandeliidae Valdés & Gosliner, 1999
- 葉海牛科 Phyllidiidae Rafinesque, 1814
多角總科 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
- 六鰓海麒麟科 Hexabranchidae^[3]
- 優美海麒麟科 Okadaiidae

在2017年的布歇特等人的腹足類分類，海牛下目及其所屬的海牛亞目改為直接隸屬裸鰓目^[5]^[1]。

截至2018年5月2日 (2018-05-02)^[update]，本下目包括下列四個總科^[1]：

海牛總科 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
葉海牛總科 Phyllidioidea Rafinesque, 1814^[4]
- 枝鰓海麒麟科^[3] Dendrodorididae O'Donoghue, 1924 (1864)
- Family Mandeliidae Valdés & Gosliner, 1999
- 葉海牛科 Phyllidiidae Rafinesque, 1814
多角總科 Polyceroidea Alder & Hancock, 1845（= Phanerobranchiata Non Suctoria）
- Family Aegiridae
- 六鰓海麒麟科 Hexabranchidae^[3]
- 優美海麒麟科 Okadaiidae
- 多角海牛科 Polyceridae Alder & Hancock, 1845：又名多角海麒麟科^[3])，併入了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 譚天錫; 白振宇; 夏國經. 台灣沿海產裸鰓目軟體動物相的分布調查. 貝類學報 (中華民國貝類學會). 1987, 13: 71–90 （中文（繁體））.
^ ^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.