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Dwarf black stingray
The dwarf black stingray (''Dasyatis parvonigra'') is a little-known species of stingray in the family Dasyatidae, found off northwestern Australia and perhaps throughout Southeast Asia at depths of . Growing to a width of , this species is characterized by an angular, diamond-shaped pectoral fin disc with a short row of spear-like thorns along the midline of the back and few dermal denticles elsewhere. Its tail bears a long fin fold along the bottom and a much shorter ridge along the top, both past the stinging spine. Plain brownish in color above, this ray can range from light to very dark. In some parts of its range, this species is occasionally caught incidentally by fisheries and sold for meat.
==Taxonomy==
Peter Last and William White described the dwarf black stingray in a 2008 Commonwealth Scientific and Industrial Research Organisation (CSIRO) publication; it had previously been termed ''Dasyatis'' "sp. A". The new stingray was given the specific epithet ''parvonigra'', from the Latin ''parvus'' ("little") and ''nigra'' ("black"), because of its superficial resemblance to the much larger black stingray (''D. thetidis'').〔 The type specimen is a male across, collected north of Cape Lambert in Western Australia. This species seems to be most related to the longtail stingray (''D. longa''), and belongs to a poorly known species complex that also includes the red stingray (''D. akajei'').
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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