English: Pelagic stingray (Pteroplatytrygon violacea) at the Fukushima Aquarium.
Русский: Синий хвостокол.
Date 30 July 2006, 11:41
Source IMG_0628
Author Makoto Nakashima http://www.flickr.com/people/55258922@N00 from Tokyo, Japan
Source: https://commons.wikimedia.org/wiki/File:Pelagic_stingray_fukushima.jpg

The pelagic stingray (Pteroplatytrygon violacea) is a species of stingray in the family Dasyatidae, and the sole member of its genus. It is characterized by the wedge-like shape of its pectoral fin disc, which is much wider than long, as well as by the pointed teeth in both sexes, whip-like tail with extremely long tail spine, and uniform violet to blue-green coloration. The distribution of the pelagic stingray extends nearly worldwide in tropical to warm-temperate pelagic waters.