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Copella (genus)
''Copella'' is a genus of freshwater fish belonging to the family Lebiasinidae, native to South America, known colloquially to aquarists as splashing tetras or splash tetras, because of the unique reproductive method of the best-known representative of the genus, ''Copella arnoldi''. They are not as closely related to the tetras proper in the Characidae as initially believed.
''Copella'' species are found in assorted slow-moving feeder tributaries of the Amazon and other large South American rivers, particularly in the north of the continent in Guyana and Venezuela.
==Description==
These fish are elongated in shape, with scales marked in such a way as to make visual differentiation of individual scales easy by simple naked-eye observation. The pectoral fins are positioned immediately behind the operculum or gill cover, while the pelvic fins are further back along the body, about midway between the head and the caudal peduncle. The dorsal fin is positioned above and slightly behind the pelvic fins, and midway between the pelvic fins and the tail fin is the anal fin. The tail fin is forked in shape. Males usually possess more elongated and ornate unpaired fins than females. In the case of ''C. arnoldi'', the tail fin of the male is somewhat asymmetrical, the upper lobe being larger than the lower lobe, and this modification of the more usual symmetrical tail fin shape (tail fin symmetry is a characteristic of the majority of fishes belonging to the Actinopterygii) is linked to the reproductive activity of the species.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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