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Hyphessobrycon
''Hyphessobrycon'' is a genus of freshwater fish in the Characidae family of order Characiformes. The ''Hyphessobrycon'' species are among the fishes known as tetras. Almost all species of this genus are native to the Neotropic ecozone in South America; about half a dozen species are from Central America and a single species, ''H. compressus'', is from southern Mexico.
==Taxonomy==
This large genus of characins includes over 100 species.〔 The systematics of ''Hyphessobrycon'' are still largely unresolved.〔 Six groups within this genus have been recognized based on color patterns alone.〔 With no phylogenetic analysis of this genus, species are placed into this genus as anatomically defined by Carl H. Eigenmann in 1917.〔 By this definition, ''Hyphessobrycon'' is identified by the presence of an adipose fin, incomplete lateral line, two tooth series in the premaxilla, with the teeth of the external series continuous in a single series, teeth not strictly conical, preventral scales arranged in more than one row, and lack of scales in the caudal fin.〔 The characteristic of extension of scales onto the caudal fin that differentiates this genus from ''Hemigrammus'' is not satisfactory as it occurs in intermediate conditions.〔
This genus is not monophyletic.〔 A monophyletic group within ''Hyphessobrycon'' has been hypothesized, termed the rosy tetra clade; this group is based upon coloration pattern and the shape of dorsal and anal fins of males.〔 Recognition of monophyletic groups among ''Hyphessobrycon'' species is complicated by the difficulty in finding characters useful for hypothesis of relationships among the species.〔 Traditional characters used to identify ''Hyphessobrycon'' are phylogenetically unreliable.〔
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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