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''Poecilia velifera'', the Yucatan molly, lives in coastal waters of the Yucatan peninsula. These live-bearer (Poeciliidae) fish are particularly well known for both the extreme size variation among males, and the sexual dimorphism between males and females in both body shape and behavior. It is outwardly similar to the sailfin molly, ''P. latipinna'', though larger overall and with a higher and longer dorsal fin in males. Full-grown fish are usually larger than 10 cm (4 in) and large females can reach almost twice this length, though especially captive-bred individuals grow only to the size of sailfin mollies. The dorsal fins are the most distinctive character for telling the species apart: Those of the Yucatan molly have nearly 20 fin rays, counting where the fin meets the back, whereas the sailfin molly has less than 15 (intermediate numbers may indicate hybrids). If the males spread their dorsal fins in display, these have a distinct fan or trapezoid shape, with the upper edge being distinctly longer than the lower. The height of the dorsal fin, measured at the posterior edge, is a bit larger than the height of the tail. ==Common names== Some names of the Yucatan molly - such as ''Segelkärpfling'' or the specific name ''velifera'' - contain an element signifying "sail", aggravating the confusion with the sailfin molly. The French terms are used for both species indiscriminately, as is the Japanese name (which is simply the Japanized form of "sailfin molly"). *Dutch: ''Hoogvinkarper'' *English: Yucatan molly, sailfin molly (though this name is often used for ''Poecilia latipinna'' as well as the commercially produced hybrids kept by fishkeepers) *French: ''Molliénésie á voilure'' or simply "molly voile" *German: ''Segelkärpfling'' *Japanese: セイルフィン モーリー (''seirufuin mōrī'') *Polish: ''Molinezja żaglopłetwa'' *Portuguese: ''Molinésia velífera'' *Russian: Моллинезия Велифера, Широкоплавничная моллинезия *Dansk: Sejlfinnemolly 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Poecilia velifera」の詳細全文を読む スポンサード リンク
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