Acronemus

Acronemus is an extinct genus of euselachian shark from the Middle Triassic of Switzerland.[1][2] It is an enigmatic genus of shark with uncertain relations to other sharks. Though originally placed within Ctenacanthiformes, it is now considered Euselachii incertae sedis, due to its mixture of features similar to hybodontiforms and neoselachians. Originally, teeth from this genus were attributed to "Acrodus bicarinatus" while fin spines were named "Nemacanthus tuberculatus". Associated material showed they were the same animal, with the older specific epithet (tuberculatus) taking precedence. The shark was given the new genus Acrocnemus, containing a single species (A. tuberculatus). Acronemus is found in the Anisian-age Grenzbitumenzone (also known as the Besano Formation) of Monte San Giorgio.[3] It was a small shark measuring 30–35 cm (0.98–1.15 ft) long.[4]

Acronemus
Temporal range:
A cast of a well-preserved fossil of Acronemus tuberculatus from Monte San Giorgio
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Infraclass: Euselachii
Family: incertae sedis
Genus: †Acronemus
Rieppel, 1982

References
  1. Rieppel, O. (1982). A new genus of shark from the Middle Triassic of Monte San Giorgio, Switzerland.
  2. "Fossilworks: Acronemus". fossilworks.org. Retrieved 17 December 2021.
  3. Maisey, John G. (2011). "The braincase of the Middle Triassic shark Acronemus tuberculatus (Bassani, 1886)". Palaeontology. 54 (2): 417–428. doi:10.1111/j.1475-4983.2011.01035.x. ISSN 1475-4983.
  4. Rieppel, O. (2019). Mesozoic Sea Dragons: Triassic Marine Life from the Ancient Tropical Lagoon of Monte San Giorgio. Indiana University Press. p. 50. doi:10.2307/j.ctvd58t86. ISBN 978-0253040114.


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