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The sixgill stingray has a bulky, flabby body with a rounded pectoral fin disc that is longer than wide. The triangular snout is much longer in adults than in juveniles (making up almost two-fifths of the disc length), and is filled with a clear gelatinous material; because of this, the snout of a dead specimen can shrink significantly when exposed to air or preservatives.
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Tooth whitening or tooth bleaching is the process of lightening the colour of human teeth. [1] Whitening is often desirable when teeth become yellowed over time for a number of reasons, and can be achieved by changing the intrinsic or extrinsic colour of the tooth enamel . [ 2 ]
The oldest known stingray taxon is "Dasyatis" speetonensis from the Hauterivian of England, whose teeth most closely resemble that of the extant sixgill stingray (Hexatrygon). Although stingray teeth are rare on sea bottoms compared to the similar shark teeth, scuba divers searching for the latter do encounter the teeth of stingrays. [6] [8]
Early Eocene fossil stingray Heliobatis radians Giant devil ray, Mobula mobular. Eschmeyer's Catalog of Fishes classigies the rays as follows: [16] Order Torpediniformes. Family Platyrhinidae D. S. Jordan, 1923 (thornbacks or fanrays) Family Narkidae Fowler, 1934 (sleeper rays) Family Narcinidae, Gill, 1862 (electric rays) Family Hypnidae Gill ...
Sixgill stingray This page was last edited on 28 March 2013, at 13:37 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ...
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