Arctacanthus

Arctacanthus; Temporal range: Permian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Order:	?Chimaeriformes
Genus:	Arctacanthus; Nielsen 1932

Arctacanthus is an extinct genus of cartilaginous fish from the Permian and possibly Triassic period. It is known by two described species from the Permian, A. uncinatus and A. wyomingensis. The former was described from Greenland while the latter was described from the United States. They are known only by isolated hook-shaped "Icthyoliths" thought to represent dermal denticles of a chimaera. 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.[1][2]

References

Lide Chen, Gilles Cuny & Xiaofeng Wang (2007) The chondrichthyan fauna from the Middle-Late Triassic of Guanling (Guizhou province, SW China), Historical Biology, 19:4, 291-300, DOI: 10.1080/08912960701248234
Yamagishi, H. (2004). Elasmobranch remains from the Taho limestone (lower-Middle Triassic) of Ehime prefecture, Southwest Japan. Mesozoic fishes, 3, 565-574.

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[1] Lide Chen, Gilles Cuny & Xiaofeng Wang (2007) The chondrichthyan fauna from the Middle-Late Triassic of Guanling (Guizhou province, SW China), Historical Biology, 19:4, 291-300, DOI: 10.1080/08912960701248234

[2] Yamagishi, H. (2004). Elasmobranch remains from the Taho limestone (lower-Middle Triassic) of Ehime prefecture, Southwest Japan. Mesozoic fishes, 3, 565-574.