Skip to main content
    • Aa
    • Aa

A new species of Bransonella (Chondrichthyes, Xenacanthimorpha, Bransonelliformes) from the Middle Permian Kaibab Formation of northern Arizona

  • David K. Elliott (a1) and John-Paul M. Hodnett (a2)

Isolated teeth from the Middle Permian (early Guadalupian) Kaibab Formation of Arizona are described as a new species of the xenacanth shark genus Bransonella. Bransonella tribula n. sp. is a small tooth in which the intermediate cusp is 65% of the length of the principal cusps and the cristae on the labial face extend down over the base, covering it, and bifurcating to form distinctive double crested ridges. Fin spines from the same localities in the Kaibab Formation show the characteristic xenacanth feature of a double row of large thorn-like denticles along the posterior margin. Bransonella tribula n. sp. is the only xenacanth shark known from the Kaibab Formation at present, however, due to the lack of articulated material the fin spines are attributed to ?Bransonella tribula n. sp. The ecomorphology of Bransonella suggests a primitive, small, gracile, marine xenacanth that fed near the sea floor like the modern catsharks (Scyliorhinidae).

Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

C. Behan , G. Walkden , and G. Cuny 2012. A Carboniferous chondrichthyan assemblage from residues within a Triassic karst system at Cromhall Quarry, Gloucestershire, England. Palaeontology, 55:12451263.

C. J. Burrow , S. Turner , and G. C. Young 2010. Middle Paleozoic microvertebrate assemblages and biogeography of East Gondwana (Australasia, Antarctica). Palaeoworld, 19:3754.

L. J. V. Compagno 1990. Alternative life-history styles of cartilaginous fishes in time and space. Environmental Biology of Fishes, 28:3575.

C. J. Duffin and M. Ginter 2006. Comments on the selachian genus Cladodus Agassiz, 1843. Journal of Vertebrate Paleontology, 26:253266.

O. Hampe and A. Ivanov 2007. Bransonelliformes—a new order of Xenacanthimorpha (Chondrichthyes, Elasmobranchii). Fossil Record, 10:190194.

J-P. Hodnett , D. K. Elliott , T. J. Olson , and J. H. Wittke 2012. Ctenacanthiform sharks from the Permian Kaibab Formation, northern Arizona. Historical Biology, 24 (4):115.

G. D. Johnson and D. W. Thayer 2009. Early Pennsylvanian xenacanth chondrichthyans from the Swisshelm Mountains, Arizona, U.S.A. Acta Palaeontologica Polonica, 54:649668.

R. Soler-Gijón 1999. Occipital spines of Orthacanthus (Xenacanthidae, Elasmobranchii): structure and growth. Journal of Morphology, 242:145.

S. Turner and C. J. Burrow 2011. A Lower Carboniferous xenacanthiform shark from Australia. Journal of Vertebrate Paleontology, 31:241257.

L. E. Tway and J. Zidek 1983. Catalog of late Pennsylvanian ichthyoliths, Part II. Journal of Vertebrate Paleontology, 2:414438.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *


Altmetric attention score

Full text views

Total number of HTML views: 0
Total number of PDF views: 1 *
Loading metrics...

Abstract views

Total abstract views: 42 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 26th July 2017. This data will be updated every 24 hours.