Cylindracanthus
Temporal range: 99.7–33.9 Ma
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Actinopterygii
Genus:
Cylindracanthus

Leidy, 1856
Species
  • †Cylindracanthus acus
  • †Cylindracanthus bisulcatus
  • †Cylindracanthus isnusris
  • †Cylindracanthus rectus

Cylindracanthus is an extinct genus of Cretaceous to Eocene aged ray-finned fish. It is almost exclusively known from bony rostrum fragments as well as some associated teeth, with the rest of the skeleton being cartilaginous. While originally considered to be closely related to billfish, the structure of its rostrum is dissimilar, and is unlikely to be closely related, some later studies suggested closer affinities to the Acipenseriformes.[1][2][3] However, this was later rejected due to the lack of osteocytes in histologically examined specimens, which resembles the condition of derived teleosts. A close relation to Blochius has been suggested.[4]

See also

References

  1. ^ Parris, D. C., Grandstaff, B. S. and Bell, G. L. 2001. Reassessment of the affinities of the extinct genus Cylindracanthus (Osteichthyes). Proceedings of the South Dakota Academy of Science, 80: 161–172.
  2. ^ Parris, D. C., Grandstaff, B. S. and Gallagher, W. B. 2007. “Fossil fish from the Pierre Shale Group (Late Cretaceous): clarifying the biostratigraphic record”. In The Geology and Paleontology of the Late Cretaceous Marine Deposits of the Dakotas, Edited by: Martin, J. E. and Parris, D. C. 99–109. Geological Society of America. Special Paper 427
  3. ^ Becker, Martin A.; Mallery, Christopher S.; Chamberlain, John A. (2010-07-14). "Osteichthyans from an Arkadelphia Formation–Midway Group lag deposit (Late Maastrichtian–Paleocene), Hot Spring County, Arkansas, U.S.A." Journal of Vertebrate Paleontology. 30 (4): 1019–1036. doi:10.1080/02724634.2010.483603. ISSN 0272-4634.
  4. ^ BARBARA S. GRANDSTAFF, RODRIGO A. PELLEGRINI ,, KENNETH A. MONSCH, DAVID C. PARRIS and DONALD CLEMENTS OVER A CENTURY OF THIN-SECTION MICROSCOPY OF THE FOSSIL FISH CYLINDRACANTHUS NEW JERSEY STATE MUSEUM INVESTIGATIONS NO. 6, 2018

External links


Chondrostei
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