【海天牛属】
海天牛属（Elysia）是海天牛科下的一个属，其下物种与裸鳃亚目生物外形相似，但并没有太多的亲缘关系WoRMS_137928。海天牛属下的许多生物都有盗食体质，可吸收藻类的叶绿体化为己用，时效长达数月之久。不过至今其具体机制还不清楚。
==种==
海天牛属下的种包括ITIS_77938
* Elysia abei Baba, 1955
* Elysia amakusana Baba, 1955
* Elysia annedupontae Ortea, Caballer, Moro & Espinosa, 2005
* Elysia asbecki Wagele, Stemmer, Burghardt & Handeler, 2010
* Elysia atroviridis Baba, 1955
* Elysia australis Quoy & Gaimard, 1832
* Elysia babai Pruvot-Fol, 1946
* Elysia bangtawaensis Swennen, 1997
* Elysia bella Pease, 1860
* Elysia bennettae Thompson, 1973
* Elysia canguzua Er. Marcus, 1955
* Elysia catulus Gould, 1870
* 长角海天牛 Elysia chilkensis Eliot, 1916
* Elysia chitwa Er. Marcus, 1955
* 绿叶海天牛 Elysia chlorotica Gould, 1870
* Elysia clarki Pierce, Curtis, Massey, Bass, Karl & Finney, 2006
* Elysia coodgeensis (Angas, 1864)
* Elysia cornigera Nuttall, 1989
* Elysia crispata Mørch, 1863（ 图片 date=20160810114907 ）
* Elysia deborahae Ortea, Caballer, Moro & Espinosa, 2005
* Elysia degeneri Ostergaard, 1955
* Elysia diomedea (Bergh, 1894)
* Elysia eugeniae Ortea & Esponosa, 2002
* Elysia evelinae Marcus, 1957
* Elysia expansa (O'Donoghue, 1924)
* Elysia fezi Vilella, 1968
* Elysia filicauda Jensen & Wells, 1990
* Elysia flava Verrill, 1901
* Elysia flavipunctata Ichikawa, 1993
* Elysia flavomacula Jensen, 1990
* Elysia furvacauda Burn, 1958
* Elysia gordanae Thompson & Jaklin, 1988
* Elysia grandifolia  Kelaart, E.F. 1858
* Elysia grandis Bergh, 1872
* Elysia haingsisiana Bergh, 1905
* Elysia halimedae Macnae, 1954
* Elysia hamatanii Baba, 1957
* Elysia hedgpethi Er. Marcus, 1961
* Elysia hendersoni Eliot, 1899
* Elysia hetta Perrone, 1990
* Elysia hirasei Baba, 1955
* 日本海天牛 Elysia japonica Eliot, 1913
* Elysia kushimotoensis Baba, 1957
* Elysia leucolegnote Jensen, 1990
* Elysia lobata Gould, 1852
* Elysia macnaei Marcus, 1982
* Elysia manriquei Ortea & Moro, 2009
* Elysia maoria Powell, 1937
* Elysia marcusi Marcus, 1972
* Elysia margaritae Fez, 1962
* Elysia mercieri Pruvot-Fol, 1930
* Elysia minima Ichikawa, 1993
* Elysia nealae Ostergaard, 1955
* Elysia nigrocapitata Baba, 1957
* Elysia nigropunctata Pease, 1871
* Elysia nisbeti Thompson, 1977
* Elysia obtusa Baba, 1938
* Elysia oerstedii Mørch, 1859
* 华丽海天牛 Elysia ornata Swainson, 1840
* Elysia papillosa A. E. Verrill, 1901
* Elysia patagonica Munian & Ortea, 1997
* Elysia patina Ev. Marcus, 1980
* Elysia picta A. E. Verrill, 1901
* Elysia pilosa Risbec, 1928
* Elysia pratensis Ortea & Espinosa, 1996
* Elysia punctata Kelaart, 1857
* Elysia purchoni Thompson, 1977
* Elysia pusilla Bergh, 1872
* Elysia rufescens Pease, 1871
* Elysia scops Ev. Marcus & Er. Marcus, 1967
* Elysia serca Er. Marcus, 1955
* Elysia setoensis Hamatani, 1968
* Elysia siamensis Swennen, 1997
* Elysia slimora Er. Marcus & Ev. Marcus, 1966
* Elysia stylifera Jensen, 1997
* Elysia subornata A. E. Verrill, 1901
* Elysia sugashimae Baba, 1955
* Elysia thompsoni Jensen, 1993
* Elysia timida Risso, 1818
* Elysia tokarensis Baba, 1957
* Elysia tomentosa Jensen, 1997
* Elysia translucens Pruvot-Fol, 1957
* Elysia trilobata Heller & Thompson, 1983
* Elysia trisinuata Baba, 1949
* Elysia tuca Ev. Marcus and Er. Marcus, 1967
* Elysia verrucosa Jensen, 1985
* Elysia viridis Montagu, 1804
* Elysia vreelandae Marcus & Marcus, 1970
* Elysia yaeyamana Baba, 1936
* Elysia zuleicae Ortea & Espinosa, 2002
被划分到其他属的生物
* Elysia arena Carlson & Hoff, 1978：Pattyclaya arena的异名 Carlson & Hoff, 1978
* Elysia gracilis Risbec, 1928：Thuridilla gracilis的异名 Risbec, 1928
* Elysia picta A. E. Verrill, 1901：Thuridilla picta的异名 A. E. Verrill, 1901
* Elysia splendida Grube, 1861：Thuridilla hopei的异名 Vérany, 1853
* Elysia vataae Risbec, 1928：Thuridilla vataae的异名 Risbec, 1928
==参考文献==
== 扩展阅读 ==
* Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
* Jensen K.R. (2007) Biogeography of the Sacoglossa (Mollusca, Opisthobranchia). Bonner Zoologische Beiträge 55:255–281
* Händeler K. & Wägele H. (2007) Preliminary study on molecular phylogeny of Sacoglossa and a compilation of their food organisms. Bonner Zoologische Beiträge 55: 231-254.
== 外部连结 ==
* title=Video of Elysia diomedea in Costa Rica