Arctacanthus is known by two named species from the Permian, A. uncinatus and A. wyomingensis.[2][1] The former was described from Greenland while the latter was described from the United States. They are known only by isolated hook-shaped "ichthyoliths" thought to represent dermal denticles of a chimaeran. Some have attributed these to teeth or hybodont cephalic spines. Similar ichthyoliths of much smaller size have been found in Japan and China in rocks of Anisian age. The large difference in age, location, and size means their attribution to this genus is uncertain; nonetheless, the species A. exiguus was named in Japan.[3][4]
Referencesedit
^ abBranson, C. C. (1934). "Permian Sharks of Wyoming and of East Greenland". Science. 79 (2054): 431. Bibcode:1934Sci....79..431B. doi:10.1126/science.79.2054.431. PMID 17756155.
^Nielsen, Eigil (1932). "Permo-Carboniferous fishes from East Greenland". Meddelelser om Grønland. 86 (3): 1–63.
^Chen, Lide; Cuny, Gilles; Wang, Xiaofeng (2007). "The chondrichthyan fauna from the Middle-Late Triassic of Guanling (Guizhou province, SW China)". Historical Biology. 19 (4): 291–300. Bibcode:2007HBio...19..291C. doi:10.1080/08912960701248234. S2CID 128482370.
^Yamagishi, H. (2004). "Elasmobranch remains from the Taho limestone (lower-Middle Triassic) of Ehime prefecture, Southwest Japan". In G. Arratia; A. Tintori (eds.). Mesozoic fishes 3 — Systematics, Paleoenvironments and Biodiversity. pp. 565–574.
arctacanthus, extinct, genus, cartilaginous, fish, from, permian, possibly, triassic, periods, temporal, range, wuchiapingian, preꞒ, nscientific, classificationdomain, eukaryotakingdom, animaliaphylum, chordataclass, chondrichthyessubclass, elasmobranchiiorder. Arctacanthus is an extinct genus of cartilaginous fish from the Permian and possibly Triassic periods ArctacanthusTemporal range Wuchiapingian PreꞒ Ꞓ O S D C P T J K Pg NScientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClass ChondrichthyesSubclass ElasmobranchiiOrder HybodontiformesSuperfamily HybodontoideaGenus ArctacanthusNielsen 1932Type species Arctacanthus uncinatusNielsen 1932Species A exiguus Yamagishi 2004 A wyomingensis Branson 1934SynonymsDolophonodus Branson 1932 1 Occurrence editArctacanthus is known by two named species from the Permian A uncinatus and A wyomingensis 2 1 The former was described from Greenland while the latter was described from the United States They are known only by isolated hook shaped ichthyoliths thought to represent dermal denticles of a chimaeran Some have attributed these to teeth or hybodont cephalic spines Similar ichthyoliths of much smaller size have been found in Japan and China in rocks of Anisian age The large difference in age location and size means their attribution to this genus is uncertain nonetheless the species A exiguus was named in Japan 3 4 References edit a b Branson C C 1934 Permian Sharks of Wyoming and of East Greenland Science 79 2054 431 Bibcode 1934Sci 79 431B doi 10 1126 science 79 2054 431 PMID 17756155 Nielsen Eigil 1932 Permo Carboniferous fishes from East Greenland Meddelelser om Gronland 86 3 1 63 Chen Lide Cuny Gilles Wang Xiaofeng 2007 The chondrichthyan fauna from the Middle Late Triassic of Guanling Guizhou province SW China Historical Biology 19 4 291 300 Bibcode 2007HBio 19 291C doi 10 1080 08912960701248234 S2CID 128482370 Yamagishi H 2004 Elasmobranch remains from the Taho limestone lower Middle Triassic of Ehime prefecture Southwest Japan In G Arratia A Tintori eds Mesozoic fishes 3 Systematics Paleoenvironments and Biodiversity pp 565 574 nbsp This article about a prehistoric cartilaginous fish is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Arctacanthus amp oldid 1185835503, wikipedia, wiki, book, books, library,
