Mcmurdodus
Temporal range:
Reconstruction as a hexanchiform
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Clade: Neoselachii
Family: †Mcmurdodontidae
White, 1968
Genus: †Mcmurdodus
White, 1968

Mcmurdodus is an extinct genus of chondrichthyan from Antarctica and Australia and the sole member of the family Mcmurdodontidae. It contains two extinct species.[1] However, the Australian species M. whitei has been found to be different from the Antarctic type species M. featherensis, and thus M. whitei has been classified into a new genus, Maiseyodus.[2]

Their teeth closely resemble those of modern sharks in the families Hexanchidae and Echinorhinidae, and they were tentatively classified in the Hexanchiformes when first described. However, more recent analyses indicate that they lack multiple layers of enameloid on their tooth crowns, something present in all modern sharks and many sharks that coexisted with Mcmurdodus. In addition, most divergence estimates for modern sharks are irreconcilable with the age of Mcmurdodus. For this reason, the Mcmurdontidae are now considered indeterminate neoselachians or even more basal chondrichthyans.[2][3][4][5]

Species

  • Mcmurdodus featherensis White, 1968
  • Maiseyodus whitei Turner, & Young, 1987

References

  1. ↑ Ginter, M. & Hampe, O. & Duffin, C.J. (2010) Handbook of Paleoichthyology, Vol. 3D: Chondrichthyes Paleozoic Elasmobranchii: Teeth Verlag Dr. Friedrich Pfeil, pp. 168, 154 fig., 4 Tab.
  2. 1 2 Long, John; Thomson, Victoria; Burrow, Carole; Turner, Susan (2021-10-28), Pradel, Alan; Denton, John S.S.; Janvier, Philippe (eds.), "Fossil chondrichthyan remains from the Middle Devonian Kevington Creek Formation, South Blue Range, Victoria" (PDF), Ancient Fishes and their Living Relatives, Munich, Germany: Verlag, Dr Friedrich Pfeil, pp. 239–245, ISBN 978-3-89937-269-4, retrieved 2023-11-30
  3. ↑ Adnet, S.; Guinot, G.; Cappetta, H.; Welcomme, J.-L. (2012). "Oldest evidence of bramble sharks (Elasmobranchii, Echinorhinidae) in the Lower Cretaceous of southeast France and the evolutionary history of orbitostylic sharks". Cretaceous Research. 35: 81–87. Bibcode:2012CrRes..35...81A. doi:10.1016/j.cretres.2011.11.021. ISSN 0195-6671.
  4. ↑ Klug, Stefanie; Kriwet, Jürgen (2013). "Node age estimations and the origin of angel sharks, Squatiniformes (Neoselachii, Squalomorphii)". Journal of Systematic Palaeontology. 11 (1): 91–110. Bibcode:2013JSPal..11...91K. doi:10.1080/14772019.2012.674066. ISSN 1477-2019.
  5. ↑ "Mcmurdodus featherensis | Shark-References". shark-references.com. Retrieved 2023-12-01.


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