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''Astyanax jordani'' is a freshwater fish of the characin family (family Characidae) of order Characiformes, native to Mexico. It is called the cave tetra (which is also used for the ''A. mexicanus'' subspecies mentioned below), or by its local Spanish name ''sardina ciega''. A blind cave fish, ''A. jordani'' is recently evolved from the Mexican tetra (''A. mexicanus''). While it can be confused with the blind cave form of ''A. mexicanus,'' it evolved separately from the surface form, and is considered a different species.〔〔 (IUCN, however, treats it as a subspecies of ''A. mexicanus.'') This characin is listed on the IUCN Red List as Vulnerable on the basis of shrinking population and an acutely restricted and diminishing habitat.〔 It is fairly resilient, however, having a population doubling time of 15 months.〔 It reportedly has been introduced to the Philippines.〔 ''Astyanax jordani'' was formerly classified as ''Anoptichthys jordani'', the sole member of genus ''Anoptichthys'', and was first described by Carl Hubbs and William T. Innes. ''Anoptichthys hubbsi'' and ''Anoptichthys antrobius'' are junior synonyms.〔 While this fish is often called "blind cave fish", that term normally refers more specifically to the blind cave form of ''A. mexicanus''. == References == 〔 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「Astyanax jordani」の詳細全文を読む スポンサード リンク
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