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Longtail stingray
:''"Longtail stingray" may also refer to ''Dasyatis thetidis'' or ''Himantura uarnak.
The longtail stingray (''Dasyatis longa'', often misspelled ''longus''),〔 is a species of stingray in the family Dasyatidae, found in the eastern Pacific Ocean from Baja California to Colombia. It inhabits sandy habitats down to a depth of . Measuring up to across, this species has a rhomboid pectoral fin disc, a lower (but not upper) fin fold on the tail, and numerous dermal denticles along the back and behind the stinging spine. The longtail stingray feeds mainly on bottom-dwelling bony fishes and crustaceans. It is aplacental viviparous, with females giving birth to 1–5 young in late summer. At present, the International Union for Conservation of Nature (IUCN) is unable to assess this species beyond Data Deficient. It is caught for food, likely throughout its range, but specific fishery data is lacking.
==Taxonomy and phylogeny==
American zoologist Samuel Garman published the original description of the longtail stingray in an 1880 issue of the scientific journal ''Bulletin of the Museum of Comparative Zoology''. He gave it the name ''Trygon longa'', in reference to the long tail, and designated a specimen from Acapulco, Mexico and another from Panama as the syntypes. Subsequent authors placed this species in the genus ''Dasyatis''.〔(Catalog of Fishes (Online Version) ). California Academy of Sciences. Retrieved on December 2, 2009.〕 A 2001 phylogenetic analysis by Lisa Rosenberger, based on morphological characters, found that the southern stingray (''D. americana'') of the western Atlantic is the sister species of the longtail stingray. These two species may have evolutionarily diverged with the formation of the Isthmus of Panama (''c.'' 3 Ma).
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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