University of Worcester Worcester Research and Publications
 
  USER PANEL:
  ABOUT THE COLLECTION:
  CONTACT DETAILS:

Evolutionary relationships among bullhead sharks (Chondrichthyes: Heterodontiformes)

Slater, T.S., Ashbrook, Kate ORCID: https://orcid.org/0000-0001-6555-8791 and Kriwet, J. (2020) Evolutionary relationships among bullhead sharks (Chondrichthyes: Heterodontiformes). Papers in Palaeontology, 6 (3). pp. 425-437. ISSN 2056-2802

[img] Text
Submission 10.10.19.pdf - Accepted Version
Restricted to Repository staff only

Download (1MB) | Request a copy
[img]
Preview
Text
AAM-with-cover-8991-Ashbrook-evolutionary-relationships-among-bullhead-sharks_merged (1).pdf - Accepted Version

Download (1MB) | Preview

Abstract

The evolution of modern sharks, skates and rays (Elasmobranchii) is largely
enigmatic due to their possession of a labile cartilaginous skeleton; consequently, taxonomic
assignment often depends on isolated teeth. Bullhead sharks (Heterodontiformes) are a group
of basal neoselachians, thus their remains and relationships are integral to understanding
elasmobranch evolution. Here we fully describe †Paracestracion danieli – a bullhead shark
from the Late Jurassic plattenkalks of Eichstätt, Germany (150–154 Ma) – for its inclusion in
cladistic analyses (employing parsimonious principles) using morphological characters from
complete †Paracestracion and Heterodontus fossil specimens as well as extant forms of the
latter. Results confirm the presence of two separate monophyletic clades within
Heterodontiformes based on predominantly non-dental characters, which show a strong divergence in body morphology between †Paracestracion and Heterodontus (the latter possessing a first dorsal fin and pectoral fins that are placed more anterior and pelvic fins that
are placed more posterior). This study emphasizes the importance of including non-dental
features in heterodontiform systematics (as compared to the use of dental characters alone)
and supports the erection of the family †Paracestracionidae. Further, phylogenetic analysis of
molecular data from five extant species suggests that crown heterodontiforms arose from a
diversification event 42.58 Ma off the west coast of the Americas.

Item Type: Article
Additional Information:

Staff and students at the University of Worcester can access the full-text of the online published article via the official URL. External users should check availability with their local library or Interlibrary Requests Service.

Uncontrolled Discrete Keywords: heterodontus, elasmobranch evolution, paracestracionidea, morphology, bullhead sharks, late jurassic, SERG
Subjects: Q Science > QE Geology
Q Science > QH Natural history
Q Science > QH Natural history > QH301 Biology
Q Science > QL Zoology
Divisions: College of Health, Life and Environmental Sciences > School of Science and the Environment
Related URLs:
Depositing User: Kate Ashbrook
Date Deposited: 13 Dec 2019 14:21
Last Modified: 27 Apr 2024 04:00
URI: https://eprints.worc.ac.uk/id/eprint/8991

Actions (login required)

View Item View Item
 
     
Worcester Research and Publications is powered by EPrints 3 which is developed by the School of Electronics and Computer Science at the University of Southampton. More information and software credits.