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pink whipray
The pink whipray (''Himantura fai'') is a species of stingray in the family Dasyatidae, with a wide but ill-defined distribution in the tropical Indo-Pacific from southern Africa to Polynesia. It is a bottom dweller that generally inhabits shallow water under deep, in sandy areas associated with coral reefs. Individuals exhibit a high degree of fidelity to particular locations. The pink whipray has a diamond-shaped pectoral fin disc wider than long, with a broad-angled snout and a very long, whip-like tail without fin folds. It has only a few small thorns on its back and is uniform brownish to grayish pink in color, becoming much darker past the tail sting. This large ray can reach across and over long.
Gregarious in nature, the pink whipray has been known to form large active and resting aggregations, and associate with other large ray species. It preys mainly on prawns, but also consumes other benthic invertebrates and bony fishes. This species is aplacental viviparous, in which the unborn young are nourished by histotroph ("uterine milk") produced by the mother. Across much of its range, substantial numbers of pink whiprays are caught incidentally by a variety of fishing gear and marketed for meat, skin, and cartilage. It is also of importance to ecotourism, being attracted to visitors with bait. The International Union for Conservation of Nature (IUCN) has listed this species under Least Concern, due to its wide distribution that includes relatively protected areas, such as northern Australia. However, its population in Southeast Asia is likely declining under heavy fishing pressure, and there it has been assessed as Vulnerable.
==Taxonomy==
The pink whipway was described by American ichthyologists David Starr Jordan and Alvin Seale in the 1906 volume of ''Bulletin of the Bureau of Fisheries'', on the basis of a specimen across collected off Apia, Samoa.〔 The specific epithet ''fai'' means "stingray" in the native languages of Samoa, Tonga, Futuna, and Tahiti.〔 Another common name for this species is Tahitian stingray.〔 In 2004, Mabel Manjaji grouped ''H. fai'' with ''H. gerrardi'', ''H. jenkinsii'', ''H. leoparda'', ''H. toshi'', ''H. uarnak'', and ''H. undulata'' in the ''uarnak'' species complex.〔
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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