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Himantura walga : ウィキペディア英語版 | Himantura walga
''Himantura walga'', the dwarf whipray or mangrove whipray, is a small stingray, a cartilaginous fish in the family Dasyatidae. It is a demersal fish and is found over the continental and insular shelf of the west central Pacific Ocean where it is heavily fished. The IUCN has assessed it as being "near-threatened". ==Description== The dwarf whipray has a maximum length of .〔 The disc width is commonly about .〔 In outline it is oval with a bluntly-pointed snout. The whip-like tail is longer than the body and lacks the skin fold found in some related species. Females have a shorter tail than males, with a bulbous tip, and both sexes have four to six erectile, venomous spines at the base of the tail. The dwarf whipray is a uniform pinkish or beige colour and has been mistaken for a horseshoe crab in turbid water.〔(【引用サイトリンク】title=Mangrove whipray: ''Himantura walga'' )〕
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