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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.
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]
Bigeye sixgill shark, Atlantic sixgill shark, Hexanchus nakamurai Teng, 1962, recorded as syn. Hexanchus vitulus Springer and Waller, 1969 (Atlantic, south-west Indian Ocean) [2] [30] Spotted sevengill cowshark or broadnose sevengill shark , Notorynchus cepedianus (Péron, 1807) (Namibia to East London) [ 2 ] [ 4 ] [ 5 ]
Genus Pliotrema has six gill slits, and Pristiophorus the more usual five. The teeth of the saw typically alternate between large and small. Saw sharks reach a length of up to 5 feet and a weight of 18.7 pounds, with females tending to be slightly larger than males. [4]
Sixgill may refer to: Cybersixgill, Cybersixgill, an Israeli cyber intelligence company; Sixgill stingray, a species of cartilaginous fish; Sixgill sawshark, a species of shark; Hexanchus, a genus of shark
Family Hexatrygonidae: Sixgill stingray Genus Hexatrygon. Hexatrygon bickelli (Sixgill stingray) Family Myliobatidae: Eagle rays and manta rays. Genus Aetobatus. Aetobatus flagellum (Longheaded eagle ray) Aetobatus narinari (Spotted eagle ray) Aetobatus narutobiei (Naru eagle ray) Aetobatus ocellatus (Ocellated eagle ray) Genus Aetomylaeus ...
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 ...
The bluntnose sixgill is a species of sixgill sharks, of genus Hexanchus, a genus that also consists of two other species: the bigeye sixgill shark (Hexanchus nakamurai) and the Atlantic sixgill shark (Hexanchus vitulus). Through their base pairs of mitochondrial genes COI and ND2, these three species of sixgills widely differ from one another.