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Pristella maxillaris : ウィキペディア英語版 | Pristella maxillaris
''Pristella maxillaris'', the only species in the genus ''Pristella'', is commonly known as the golden pristella tetra or X-ray tetra or X-ray fish because of its highly transparent body. It is a widely distributed and adaptable fish, being found in the Amazon and Orinoco basins, as well as coastal rivers in the Guianas in both acidic and alkaline waters. Unlike most other characins, it is tolerant of (and sometimes found in) slightly brackish water.〔Monks N. (editor): ''Brackish Water Fishes'', TFH 2006, ISBN 0-7938-0564-3〕 It is small (up to around in length) and lives in large groups, and males can be distinguished from females by being smaller and thinner than the females. Like most other tetras, it feeds primarily on small insects and planktonic animals. ==Nomenclature== Older aquarium books often refer to this species by an obsolete Latin name, ''Pristella riddlei''. Aquarists tend to refer to this fish as the golden pristella tetra, though some call it the X-ray tetra, instead.〔 Other common names include goldfinch tetra, a reference to the similarly coloured goldfinch, and pristella tetra, a modification of its Latin name.〔 A common name that was once widespread but is now rarely used is signal tetra, a reference to the similarity between the yellow and black dorsal fin and the arm of a semaphore railway signal.〔Riehl R. & Baensch H: Aquarium Atlas (vol. 1), Voyageur Press, 1996, ISBN 3-88244-050-3〕
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