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The butterfly splitfin or butterfly goodeid, ''Ameca splendens'', is a bony fish from the monotypic genus ''Ameca''〔 Etymology: "The generic name ''Ameca'' is from the name of the river to (basin of ) which the new genus is evidently confined. The gender is feminine." "The specific epithet, of Latin derivation, means bright (shining) or glowing, in reference to the striking life colors of the new species." (Miller & Fitzsimons, 1971)〕 of the splitfin family (Goodeidae). It was formerly found throughout the Ameca River drainage in Mexico; the type locality is Rio Teuchitlán in the vicinity of Teuchitlán, Jalisco. The species was only ever found in an area about 10 miles (15 km) in diameter.〔Miller & Fitzsimons (1971), Kelley ''et al.'' (2006)〕 Today, the species is rated as extinct in the wild by the IUCN, though this assessment is obsolete:〔Contreras-Balderas & Almada-Villela (1996)〕 a remnant population has been found to persist in El Rincón waterpark near the town of Ameca. Possibly, it also exists in a feral state in the USA; individuals apparently derived from escaped or introduced captive stock were met with in southeastern Nevada.〔Fuller (2006)〕 For some time, it was a popular fish among aquarists, but hobbyist stocks have declined recently, placing its survival in jeopardy.〔Kelley ''et al.'' (2006)〕 ==Description== As its common name implies, it is indeed quite an attractive fish. A dominant mature male specimen a large dorsal fin which like the caudal fin is washed with black. A yellow band stretches along the caudal's back margin. The body of both sexes is ochre, with silvery sides and a brownish back, which in males usually have numerous glittering metallic scales. Females and immatures having black dots on the sides and ochre fins. The fins of males intensify in color when they are excited, and depending on their mood, they can show more or less strongly a black band along the side. For the first two weeks or so after birth, the young are entirely silvery.〔Miller & Fitzsimons (1971), Tavares ()〕 Males can also be told apart from females because their anal fin's front part splits off and transforms to a blunt, flexible andropodium used for mating. As usual in live-bearers, males are the smaller sex, reaching some 3 in (7–8 cm) total length at best, with females being able to grow up to 4 in (10 cm) under good conditions.〔 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「Butterfly splitfin」の詳細全文を読む スポンサード リンク
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