Arctacanthus

{{Short description|Extinct genus of fish}} {{Automatic taxobox | taxon = Arctacanthus | fossil_range = {{fossil range|Wuchiapingian|latest = Anisian}} | authority = Nielsen, 1932 | type_species = {{extinct}}''Arctacanthus uncinatus'' | type_species_authority = Nielsen, 1932 | synonyms = ''Dolophonodus'' Branson, 1932<ref name=Branson1934/> | subdivision = *{{extinct}}''A. exiguus'' Yamagishi, 2004 *{{extinct}}''A. wyomingensis'' Branson, 1934 }} '''''Arctacanthus''''' is an extinct genus of cartilaginous fish from the Permian and possibly Triassic periods.

==Occurrence== ''Arctacanthus'' is known by two named species from the Permian, ''A. uncinatus'' and ''A. wyomingensis''.<ref>{{cite journal |last=Nielsen |first=Eigil |author-link=Eigil Nielsen (paleontologist) |year=1932 |title=Permo-Carboniferous fishes from East Greenland |journal=Meddelelser om Grønland |volume=86 |issue=3 |pages=1–63}}</ref><ref name=Branson1934>{{cite journal |last=Branson |first= C. C. |year=1934 |title=Permian Sharks of Wyoming and of East Greenland |journal=Science |volume=79 |issue=2054 |pages=431 |doi=10.1126/science.79.2054.431|pmid= 17756155 |bibcode= 1934Sci....79..431B }}</ref> 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.<ref>{{cite journal |last1=Chen |first1=Lide |last2=Cuny |first2=Gilles |last3=Wang |first3=Xiaofeng |year=2007 |title=The chondrichthyan fauna from the Middle-Late Triassic of Guanling (Guizhou province, SW China) |journal=Historical Biology |volume=19 |issue=4 |pages=291–300 |doi=10.1080/08912960701248234|bibcode=2007HBio...19..291C |s2cid=128482370 }}</ref><ref>{{cite book |last=Yamagishi |first=H. |year=2004 |chapter=Elasmobranch remains from the Taho limestone (lower-Middle Triassic) of Ehime prefecture, Southwest Japan |title=Mesozoic fishes 3 — Systematics, Paleoenvironments and Biodiversity |editor1=G. Arratia |editor2=A. Tintori |pages=565–574}}</ref>

==References== {{Reflist}} {{Chondrichthyan genera|Es.}} {{Taxonbar|from=Q99774850}}

Category:Prehistoric cartilaginous fish genera Category:Permian Greenland Category:Fossils of Greenland Category:Permian Wyoming Category:Fossils of Wyoming Category:Hybodontiformes