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A new species of Anteophthalmosuchus (Crocodylomorpha, Goniopholididae) from the Lower Cretaceous of the Isle of Wight, United Kingdom, and a review of the genus

A new species of Anteophthalmosuchus (Crocodylomorpha, Goniopholididae) from the Lower Cretaceous of the Isle of Wight, United Kingdom, and a review of the genus
A new species of Anteophthalmosuchus (Crocodylomorpha, Goniopholididae) from the Lower Cretaceous of the Isle of Wight, United Kingdom, and a review of the genus
A new species of goniopholidid crocodyliform, Anteophthalmosuchus epikrator sp. nov., is herein described based on two specimens from the Wessex Formation of the Isle of Wight, UK. These specimens were previously referred to the type species Anteophthalmosuchus hooleyi. In addition, we provide a comprehensive redescription of the A. hooleyi holotype. The new species has several skull table and iliac morphological characteristics that distinguish it from A. hooleyi, such as: sub-square supratemporal fossae; thicker iliac crest that is not positioned low at the anterior iliac margin; absence of a bulge formed by the anterior convergence of the iliac and supraacetabular crests; a ‘wasp-waisted’ postacetabular process; and, a comparatively deeper acetabular fossa. The evolutionary relationships of A. epikrator were assessed in phylogenetic analyses that affirmed its status as a distinct species that is closely related to A. hooleyi. An additional Anteophthalmosuchus specimen from Belgium, the so called ‘Dollo's goniopholidid’, recently assigned to A. hooleyi is here referred to A. epikrator, based on the shared autapomorphies, and moreover, the results from the phylogenetic analyses which confirm the ‘Dollo's goniopholidid’ close affinity with the new species. Intriguingly, two of our cladistic analyses yielded a paraphyletic Anteophthalmosuchus in regards to the Spanish Anteophthalmosuchus species, A. escuchae, which was recovered forming a trichotomy with Hulkeopholis spp. The exclusion of A. escuchae from the cladistic analysis not only restored the monophyletic status of Anteophthalmosuchus, but also resolved previously found unsettled relationships within Goniopholididae. The most likely reason for this puzzling phylogenetic outcome is the relatively fragmentary nature of the Spanish Anteophthalmosuchus specimens, therefore, necessitating further study of new material in order to help elucidate its taxonomic relationships.
0195-6671
340-383
Ristevski, Jorgo
290b85e2-3b78-41e7-b5a6-94ba8e8bf5c3
Young, Mark T.
d9880973-1dd1-4b1c-81a8-7494170dbac2
De Andrade, Marco Brandalise
bfb4031b-5139-4354-bc5e-2585d5781b73
Hastings, Alexander K.
346bbd55-0fec-490b-a16a-5ef55818a8f8
Ristevski, Jorgo
290b85e2-3b78-41e7-b5a6-94ba8e8bf5c3
Young, Mark T.
d9880973-1dd1-4b1c-81a8-7494170dbac2
De Andrade, Marco Brandalise
bfb4031b-5139-4354-bc5e-2585d5781b73
Hastings, Alexander K.
346bbd55-0fec-490b-a16a-5ef55818a8f8

Ristevski, Jorgo, Young, Mark T., De Andrade, Marco Brandalise and Hastings, Alexander K. (2018) A new species of Anteophthalmosuchus (Crocodylomorpha, Goniopholididae) from the Lower Cretaceous of the Isle of Wight, United Kingdom, and a review of the genus. Cretaceous Research, 84, 340-383. (doi:10.1016/j.cretres.2017.11.008).

Record type: Article

Abstract

A new species of goniopholidid crocodyliform, Anteophthalmosuchus epikrator sp. nov., is herein described based on two specimens from the Wessex Formation of the Isle of Wight, UK. These specimens were previously referred to the type species Anteophthalmosuchus hooleyi. In addition, we provide a comprehensive redescription of the A. hooleyi holotype. The new species has several skull table and iliac morphological characteristics that distinguish it from A. hooleyi, such as: sub-square supratemporal fossae; thicker iliac crest that is not positioned low at the anterior iliac margin; absence of a bulge formed by the anterior convergence of the iliac and supraacetabular crests; a ‘wasp-waisted’ postacetabular process; and, a comparatively deeper acetabular fossa. The evolutionary relationships of A. epikrator were assessed in phylogenetic analyses that affirmed its status as a distinct species that is closely related to A. hooleyi. An additional Anteophthalmosuchus specimen from Belgium, the so called ‘Dollo's goniopholidid’, recently assigned to A. hooleyi is here referred to A. epikrator, based on the shared autapomorphies, and moreover, the results from the phylogenetic analyses which confirm the ‘Dollo's goniopholidid’ close affinity with the new species. Intriguingly, two of our cladistic analyses yielded a paraphyletic Anteophthalmosuchus in regards to the Spanish Anteophthalmosuchus species, A. escuchae, which was recovered forming a trichotomy with Hulkeopholis spp. The exclusion of A. escuchae from the cladistic analysis not only restored the monophyletic status of Anteophthalmosuchus, but also resolved previously found unsettled relationships within Goniopholididae. The most likely reason for this puzzling phylogenetic outcome is the relatively fragmentary nature of the Spanish Anteophthalmosuchus specimens, therefore, necessitating further study of new material in order to help elucidate its taxonomic relationships.

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Accepted/In Press date: 9 November 2017
e-pub ahead of print date: 5 December 2017
Published date: 1 April 2018

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Local EPrints ID: 416821
URI: https://eprints.soton.ac.uk/id/eprint/416821
ISSN: 0195-6671
PURE UUID: b3ba458e-760b-4196-afd1-d030acb50290

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Date deposited: 11 Jan 2018 17:30
Last modified: 11 Jan 2018 17:30

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Contributors

Author: Jorgo Ristevski
Author: Mark T. Young
Author: Marco Brandalise De Andrade
Author: Alexander K. Hastings

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