Acanthorhachis

Acanthorhachis is an enigmatic extinct genus of chondrichthyan from the Carboniferous period.[1] Its name is derived from the Greek word acanthos meaning "spine" and the Greek suffix for spine, -rhachis. This is due to the spine-like dermal denticles and their subsidiary spines, which coated the exterior of the animal. The authors who erected this genus suggested the common name "The Spiny Spined Shark." It is closely related to Listracanthus. It differs from it in the size, structure, and distribution of dermal spines. It is currently monotypic, containing only the species A. spinatus. This shark is thus far only described from the British Isles. Acanthorhachis was first described from the Westphalian-aged lower coal measures of Yorkshire, England.[2] It occurs rarely in Viséan-aged Eyam Limestone of Derbyshire, England.[3]

Acanthorhachis
Temporal range: Visean– Westphalian
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: incertae sedis
Family: †Listracanthidae
Genus: †Acanthorhachis
Martill, Del Strother, & Gallien, 2013
Species:
†A. spinatus
Binomial name
†Acanthorhachis spinatus
Martill, Del Strother, & Gallien, 2013

References
  1. "Fossilworks: Acanthorhachis". fossilworks.org. Retrieved 2020-09-12.
  2. MARTILL, DAVID M.; DEL STROTHER, PETER J. A.; GALLIEN, FLORENCE (2013-07-08). "Acanthorhachis, a new genus of shark from the Carboniferous (Westphalian) of Yorkshire, England". Geological Magazine. 151 (3): 517–533. doi:10.1017/s0016756813000447. ISSN 0016-7568.
  3. Smith, Roy; Martill, David M.; Duffin, Christopher (2017-06-01). "The shark-beds of the Eyam Limestone Formation (Lower Carboniferous, Viséan) of Steeplehouse Quarry, Wirksworth, Derbyshire, UK". Proceedings of the Geologists' Association. 128 (3): 374–400. doi:10.1016/j.pgeola.2017.04.004. ISSN 0016-7878.


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