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Titicaca orestias
The Titicaca orestias (''Orestias cuvieri''), also known by its native name amanto, is a likely extinct freshwater killifish from Lake Titicaca in South America. It belongs in the genus ''Orestias'', a group of fish endemic to Altiplano lakes in the Andes. With a body length of , it was the largest member in that genus. In the hope that an undiscovered population remains, it is listed as Data Deficient by the IUCN. Despite its name, it is not the only ''Orestias'' from Lake Titicaca.
Its mouth was nearly turned upwards and therefore the flat head had a dished shape. The head took nearly a third of the whole body length. The upperside was greenish-yellow to umber. The lower jaw was black. Its scales were oddly light coloured at their centre. The scales of the young were blotched.
The Titica orestias became extinct due to competition by introduced trout like the lake trout, brown trout, or the rainbow trout as well as silversides (Atherinopsidae) from the 1930s to the 1950s. A survey in 1962 failed to find any Titicaca orestias.
==History==
''Orestias cuvieri'' is a species of killfish that belongs in the genus ''Orestias''. Other related species of ''Orestias'' live in the region, forming a species flock.〔Parenti, L. (1984). A taxonomic revision of the Andean Killifish genus ''Orestias'' (Cyprinodontiformes, Cyprinodontidae). Bulletin of the American Museum of Natural History, 107–214.〕 This species is thought to be as old as five million years and to have lived in Lake Titicaca until it became extinct.
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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