海天牛屬（Elysia）是海天牛科下的一個屬，其下物種與裸鰓亞目生物外形相似，但並沒有太多的親緣關係。[1] 海天牛屬下的許多生物都有盜食體質，可吸收藻類的葉綠體化為己用，時效長達數月之久。不過其具體機制還不清楚.
海天牛科(Elysiidae=Plakobranchidae)動物小型,少數種類小—中型。身體柔軟、光滑、細長,呈蛞蝓形—葉形。或短而低平,呈筒柱形,如多葉鰓屬Placobranchus。頭頸部細長或短。眼無柄,位於嗅角基部兩側,相距較遠,周圍常有色斑圍繞,如海天牛屬Elysia。嗅角細長,外側具裂溝,呈耳形。側足發達,成體非常寬,反折豎立於體背兩側,生活時能擴展狀如翼。側足內面有縱褶,有肝分支到達。體背兩側裝飾有背鰓突起,細長形,呈棍棒狀,或膨脹呈球狀、葉片狀,有肝分支和蛋白腺分支到達。肛門位於體右側的近前端或背中部近後端。足後端伸長形成尾部。陰莖開口在左眼的下面,有些種類有刺針。成體無貝殼。沒有顎片。齒舌單列,齒呈匙形或木鞋形,有上升齒和下降齒,常有小鋸齒。廢棄齒保存於廢棄齒囊中,少數種類沒有廢棄齒囊,或廢棄齒堆積在下降齒兩側。本科動物體色多為青綠色,有美麗的各色斑點和眼斑.
基本介紹
中國海天牛,海天牛屬下的種包括,
中國海天牛
中國近海採集的標本進行了整理、鑑定，共有海天牛科動物2屬9種，其中1種為新記錄。
This paperdealswith Elysiidae(Opisthobranchia)collectedfrom theChinacoast. Thetotal9speciesidentifiedspecies belong to2genusand1speciesare firstrecordsforChina.
海天牛屬下的種包括
- 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
- Elysia chilkensis Eliot, 1916
- Elysia chitwa Er. Marcus, 1955
- 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
- 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
- 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
- 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被劃分到其他屬的生物
- Elysia arena Carlson & Hoff, 1978：Pattyclaya arena的異名 Carlson & Hoff, 1978
- Elysia gracilis Risbec, 1928：Thuridilla gracilis的異名 Risbec, 1928
- Elysia picta A. E. Verrill, 1901：Thuridilla picta的異名 A. E. Verrill, 1901
- Elysia splendida Grube, 1861：Thuridilla hopei的異名 Vérany, 1853
- Elysia vataae Risbec, 1928：Thuridilla vataae的異名 Risbec, 1928
