Finless sleeper ray: Difference between revisions
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{{Taxobox |
{{Taxobox |
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| name = Finless sleeper ray |
| name = Finless sleeper ray |
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| image = |
| image = Temera hardwickii by gray.jpg |
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| image_width = 240px |
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| status = VU |
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| status_system = IUCN3.1 |
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| status_ref = <ref name="iucn">{{IUCN2010 |assessors=Carvalho, M.R. de, M.E. McCord, and C. Vidthayanon |year=2004 |title=Temera hardwickii |id=161745 |version=2010.2 |downloaded=September 17, 2010}}</ref> |
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| regnum = [[Animalia]] |
| regnum = [[Animalia]] |
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| phylum = [[Chordata]] |
| phylum = [[Chordata]] |
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| classis = [[Chondrichthyes]] |
| classis = [[Chondrichthyes]] |
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| subclassis = [[Elasmobranchii]] |
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| ordo = [[Torpediniformes]] |
| ordo = [[Torpediniformes]] |
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| familia = [[Narcinidae]] |
| familia = [[Narcinidae]] |
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| genus = '''''Temera''''' |
| genus = '''''Temera''''' |
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| genus_authority = Gray 1831 |
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| species = '''''T. hardwickii''''' |
| species = '''''T. hardwickii''''' |
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| binomial = ''Temera hardwickii'' |
| binomial = ''Temera hardwickii'' |
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| binomial_authority = Gray, 1831}} |
| binomial_authority = Gray, 1831 |
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}} |
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The '''finless sleeper ray''' |
The '''finless sleeper ray''' (''Temera hardwickii'') is a little-known species of [[electric ray]] in the sleeper ray family, [[Narkidae]], known for producing [[electricity|electrical]] discharges for defense. It is the sole species in its genus.<ref name="fishbase">{{FishBase_species| genus=Temera |species=hardwickii | month=October |year=2008}}</ref> The finless sleeper ray has a large, round [[pectoral fin]] disc and a short, rounded [[tail fin]]. It is unique amongst the electric rays for lacking [[dorsal fin]]s. The dorsal coloration is brown, uniform or with irregular blackish markings or whitish spots.<ref>Günther, Albert. (1870) ''Catalogue of the Fishes in the British Museum.'' London: The Trustees, British Museum (Natural History). Dept. of Zoology.</ref><ref>Gray, John Edward. (1831). ''The Zoological Miscellany: to be continued occasionally.'' Treuttel, Wurtz and Co.</ref> It reaches a maximum of 46 cm long but most individuals are less than 15 cm, making it one of the smallest electric rays. The females attain maturity at 11-12 cm and the males at 11 cm.<ref name="compagno"/> |
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This species occurs in the [[Pacific Ocean]] from the [[Andaman Sea]] near the southern [[Thailand]]-[[Myanmar]] border, through the [[Straits of Malacca]] and the [[Malay Peninsula]] to [[Singapore]] and [[Vietnam]]. It also occurs off [[Thailand]] but specific locations are unknown. It is found in both inshore and offshore continental waters and is locally common. Like other narkids, the finless sleeper ray is [[ovoviviparous]]; one female examined contained four [[fetus]]es.<ref name="compagno">Compagno, L.J.V. and Last, P.R. (1999). Narkidae. Sleeper rays. p. 1443-1446. In: K.E. Carpenter and V.H. Niem (eds.) ''FAO identification guide for fishery purposes. The living marine resources of the Western Central Pacific.'' Rome: [[Food and Agricultural Organization]].</ref> |
This species occurs in the [[Pacific Ocean]] from the [[Andaman Sea]] near the southern [[Thailand]]-[[Myanmar]] border, through the [[Straits of Malacca]] and the [[Malay Peninsula]] to [[Singapore]] and [[Vietnam]]. It also occurs off [[Thailand]] but specific locations are unknown. It is found in both inshore and offshore continental waters and is locally common. Like other narkids, the finless sleeper ray is [[ovoviviparous]]; one female examined contained four [[fetus]]es.<ref name="compagno">Compagno, L.J.V. and Last, P.R. (1999). Narkidae. Sleeper rays. p. 1443-1446. In: K.E. Carpenter and V.H. Niem (eds.) ''FAO identification guide for fishery purposes. The living marine resources of the Western Central Pacific.'' Rome: [[Food and Agricultural Organization]].</ref> |
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Revision as of 00:09, 18 September 2010
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| Genus: | Temera Gray 1831
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| Species: | T. hardwickii
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| Binomial name | |
| Temera hardwickii Gray, 1831
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The finless sleeper ray (Temera hardwickii) is a little-known species of electric ray in the sleeper ray family, Narkidae, known for producing electrical discharges for defense. It is the sole species in its genus.[2] The finless sleeper ray has a large, round pectoral fin disc and a short, rounded tail fin. It is unique amongst the electric rays for lacking dorsal fins. The dorsal coloration is brown, uniform or with irregular blackish markings or whitish spots.[3][4] It reaches a maximum of 46 cm long but most individuals are less than 15 cm, making it one of the smallest electric rays. The females attain maturity at 11-12 cm and the males at 11 cm.[5]
This species occurs in the Pacific Ocean from the Andaman Sea near the southern Thailand-Myanmar border, through the Straits of Malacca and the Malay Peninsula to Singapore and Vietnam. It also occurs off Thailand but specific locations are unknown. It is found in both inshore and offshore continental waters and is locally common. Like other narkids, the finless sleeper ray is ovoviviparous; one female examined contained four fetuses.[5]
References
- ^ Template:IUCN2010
- ^ Froese, Rainer; Pauly, Daniel (eds.). "Temera hardwickii". FishBase. October 2008 version.
- ^ Günther, Albert. (1870) Catalogue of the Fishes in the British Museum. London: The Trustees, British Museum (Natural History). Dept. of Zoology.
- ^ Gray, John Edward. (1831). The Zoological Miscellany: to be continued occasionally. Treuttel, Wurtz and Co.
- ^ a b Compagno, L.J.V. and Last, P.R. (1999). Narkidae. Sleeper rays. p. 1443-1446. In: K.E. Carpenter and V.H. Niem (eds.) FAO identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Rome: Food and Agricultural Organization.