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Hortle's whipray
The Hortle's whipray (''Himantura hortlei'') is a little-known species of stingray in the family Dasyatidae, occurring in shallow estuaries and mud flats off southern New Guinea. This species, growing to across, has a heart-shaped pectoral fin disc with a long, pointed snout and minute eyes. It has a wide dorsal band of dermal denticles extending from in front of the eyes to the tail, as well as scattered sharp denticles on the snout. The underside of the disc is a distinctive bright yellow in color, sometimes with darker markings around the nostrils, mouth, and gill slits. The Hortle's whipray is threatened by extensive seine fisheries and habitat degradation, leading the International Union for Conservation of Nature (IUCN) to assess it as Vulnerable.
==Taxonomy==
The Hortle's whipray was named after Kent Hortle, a biological consultant at the Freeport mine in the Indonesian province of Papua, who provided the first photographs and fresh specimens of the ray to biologists. The species was formally described by Peter Last, Mabel Manjaji-Matsumoto, and Patricia Kailola in a 2006 issue of the scientific journal ''Zootaxa''. An adult male across, collected from the estuary of the Minajerwi River, was designated as the type specimen. This ray belongs to the 'uarnacoides' species complex, along with ''H. chaophraya'', ''H. granulata'', ''H. lobistoma'', ''H. pastinacoides'', and ''H. uarnacoides''.
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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