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]。
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)
- 異名
- 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