Gymnura crooki (lat.) Is a species of the genus of the stingrays-butterflies of the family of the anthemous order of the caudate . These stingrays live in the subtropical waters of the northwestern Pacific Ocean off the coast of Hong Kong . Lead a bottom lifestyle. The pectoral fins of butterfly rays form a disk whose width is much greater than its length. Behind the eyes are sprays . The maximum width of the disk is 45 cm. Reproduction occurs by egg-production . Embryos develop in the womb, feeding on the yolk and histotroph [1] .
| Gymnura crooki |
| Scientific classification |
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| No rank : | Bilateral symmetrical |
| Family: | Gymnastics ( Gymnuridae Fowler, 1934 ) |
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| International scientific name |
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Gymnura crooki = Fowler , 1934 |
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Content
The new species was first described in 1934 [2] . He is known for only one male 45 cm long, found on the market in Kowloon and designated as a holotype [3] . The species is named after Alfred Crook, a former principal at Queens College, Hong Kong. [4]
The pectoral fins of the stingrays-butterflies merge to form a diamond-shaped disk, they are elongated in the form of wide βwingsβ exceeding the length of the disk. Snout short and wide with a blunt tip. Behind the eyes there are splashes. A rather large curved mouth, nostrils and 5 pairs of gill slits are located on the ventral side of the disk. Between the nostrils lies a leather flap. The teeth are small, narrow and pointed. The ventral fins are small and rounded [5] .
Like other tailed-like stingrays, butterfly rays breed by egg-production. Embryos develop in the womb, feeding on the yolk and histotroph [1] .
The International Union for Conservation of Nature has not yet evaluated the conservation status of this species.
- Species of Gymnura crooki (English) in the World Register of Marine Species .
- β 1 2 Gymnura crooki in the FishBase database.
- β Fowler, HW (1934) Descriptions of new fishes obtained 1907 to 1910, chiefly in the Philippine Islands and adjacent seas. Proceedings of the Academy of Natural Sciences of Philadelphia, 85: 233-367
- β Gymnura crooki (neopr.) . Shark References. Date of treatment December 17, 2014.
- β Christopher Scharpf and Kenneth J. Lazara. Fish Name Etymology Database (Neopr.) . The ETYFish Project . Date of treatment April 13, 2014.
- β Compagno, LJV; Last, PR Gymnuridae: Butterfly rays = In Carpenter, KE; Niem, VH, eds. FAO Identification Guide for Fishery Purposes: The Living Marine Resources of the Western Central Pacific. - Food and Agricultural Organization of the United Nations, 1999. - S. 1506-1510. - ISBN 92-5-104302-7 .