螔螺屬

螔螺屬（學名：）是翼足目螔螺科之下的一個海洋腹足綱軟體動物門屬，即俗稱「海蝴蝶」的一種。本屬物種是腹足綱之下其中一個物種非常豐富的屬。

本屬的學名「Limacina」本身的意思其實就是「像蝸牛」

作為一種在海洋的浮游生物界生活的腹足綱物種，螔螺屬透過拍動牠們的一雙擬足（亦作疣足，parapoida）來在水中暢泳，所以得來「海蝴蝶」的美名。

海蝴蝶是有殼翼足類支序（Thecosomata）的成員，與之相對的是屬於裸殼翼足類支序（Gymnosomata）的海天使。這兩個支序的成員合組成為翼足類。兩者的分別在於有殼翼足類的成員的背上還留有一個或大或小的殼，但裸殼翼足類的殼已完全褪化。

物種
本屬物種同時有化石種及生存種，分別如下：
 † Limacina atypica (Laws, 1944) 
 (recent) Limacina bulimoides (d'Orbigny, 1836)- Bulimoid pteropod. Distribution: Red Sea, Pacific. Length: 1.2 mm.
 † Limacina erasmiana Janssen, 2010
  † Limacina dilatata (Koenen, 1892)
 † Limacina ferax (Laws, 1944) 
 † Limacina gormani (Curry, 1982)
 † Limacina guersi Janssen, 2010
螔螺 Limacina helicina (Phipps, 1774)：模式種。
 (recent) Limacina lesueurii (d'Orbigny, 1836) - Distribution: North America, Western Atlantic.
 † Limacina limata (Marwick, 1926)
 † Limacina pygmaea (Lamarck, 1805)
 (recent)  Limacina rangii (d'Orbigny, 1834)
后弯螔螺 Limacina retroversa (Fleming, 1823)：分布於北美洲的西大西洋及北冰洋，屬於是亚寒带种。
 † Limacina sculptilis (Maxwell, 1992) 
 † Limacina taylori (Curry, 1965)
 (recent) Limacina trochiformis (d'Orbigny, 1836) - Trochiform pteropod. Distribution: North America, Western Atlantic, Red Sea, Pacific. Length: 1 mm.
 † Limacina valvatina (Reuss, 1867)
 † Limacina? vegrandis Cahuzac & Janssen, 2010

下列物種皆為同種異名：
 (recent) Limacina antarctica Woodward, 1854::synonym of Limacina rangii f. antarctica Woodward, 1854: synonym of Limacina rangii (d'Orbigny, 1834)
 Limacina balea Møller, 1841: synonym of Limacina retroversa (Fleming, 1823)
 Limacina contorta Sykes, 1905: synonym of Limacina trochiformis (d'Orbigny, 1834)
 Limacina crossei Pelseneer, 1888: synonym of Limacina lesueurii (d'Orbigny, 1835)
 Limacina cucullata Gould, 1852: synonym of Limacina rangii f. antarctica Woodward, 1854: synonym of Limacina rangii (d'Orbigny, 1834)
 Limacina helicialis Lamarck, 1819: synonym of Limacina helicina (Phipps, 1774)
 (recent) Limacina helicoides Jeffreys, 1877 - synonym of Thielea helicoides (Jeffreys, 1877)
 (recent) Limacina inflata (d'Orbigny, 1836) - Planorbid pteropod. Distribution: circumglobal, Red Sea, Pacific. Length: 1 mm. Description: the shell is flatly twisted, resembling the shell of the cephalopod Nautilus. - synonym: Heliconoides inflata (d’Orbigny, 1836)
 Limacina naticoides Souleyet, 1852: synonym of Limacina trochiformis (d'Orbigny, 1834)
 Limacina pacifica Dall, 1871: synonym of Limacina helicina pacifica Dall, 1871
 Limacina scaphoidea Gould, 1852: synonym of Heliconoides inflatus (d'Orbigny, 1834)

參考文獻

 Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). ISBN 0-915826-22-4. XII, 195 pp.
 Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180–213

外部連結