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A new bernissartiid crocodyliform from the Lower Cretaceous Wessex Formation (Wealden Group, Barremian) of the Isle of Wight, southern England

A new bernissartiid crocodyliform from the Lower Cretaceous Wessex Formation (Wealden Group, Barremian) of the Isle of Wight, southern England
A new bernissartiid crocodyliform from the Lower Cretaceous Wessex Formation (Wealden Group, Barremian) of the Isle of Wight, southern England

A substantially complete skull of a small crocodyliform recently found on the foreshore near Yaverland on the southeast coast of the Isle of Wight, southern England is described. The locality, mode of preservation and associated matrix indicate that it is derived from one of the plant debris beds of the Lower Cretaceous Wessex Formation (Barremian, Wealden Group). The dentition, unique among crocodyliforms, serves to confirm that the specimen is referable to the, until now, monotypic family Bernissartiidae. Apomorphies, including placement of the choana entirely within the pterygoids and disposition of cranial sutures demonstrate that the Isle of Wight skull cannot be referred to Bernissartia fagesii, known from contemporaneous strata. Furthermore, these characters indicate that the specimen should not be referred to a new species of Bernissartia. It is therefore placed in a new genus and species, Koumpiodontosuchus aprosdokiti. The systematic position of Bernissartiidae, and characters used to diagnose Eusuchia, including placement of the choana(e) within the prerygoids, are discussed. Until recently this condition was thought to be restricted to Eusuchia with all non-eusuchian neosuchian crorocdiliforms possessing choanae bounded posteriorly by the pterygoids and anteriorly by the palatines. While the choana of Koumpiodontosuchus aprosdokiti gen. et sp. nov. is entirely bounded by the pterygoids it differs from the choanae of eusuchians in lacking a median septum, being anteroposteriorly elongate and in its anterior placement.

Barremian, Bernissartiidae, Cretaceous, Crocodyliformes, England, Eusuchia, Neosuchia, Wealden
0567-7920
257-268
Sweetman, Steven C.
6f440983-ba3e-4c84-a08b-6873f57c6f1f
Pedreira-Segade, Ulysse
23a3acc9-7185-41ce-b572-0cbd184322b8
Vidovic, Steven U.
abba74b7-4c91-4f08-b8f1-4d9e836a43e4
Sweetman, Steven C.
6f440983-ba3e-4c84-a08b-6873f57c6f1f
Pedreira-Segade, Ulysse
23a3acc9-7185-41ce-b572-0cbd184322b8
Vidovic, Steven U.
abba74b7-4c91-4f08-b8f1-4d9e836a43e4

Sweetman, Steven C., Pedreira-Segade, Ulysse and Vidovic, Steven U. (2015) A new bernissartiid crocodyliform from the Lower Cretaceous Wessex Formation (Wealden Group, Barremian) of the Isle of Wight, southern England. Acta Palaeontologica Polonica, 60 (2), 257-268. (doi:10.4202/app.00038.2013).

Record type: Article

Abstract

A substantially complete skull of a small crocodyliform recently found on the foreshore near Yaverland on the southeast coast of the Isle of Wight, southern England is described. The locality, mode of preservation and associated matrix indicate that it is derived from one of the plant debris beds of the Lower Cretaceous Wessex Formation (Barremian, Wealden Group). The dentition, unique among crocodyliforms, serves to confirm that the specimen is referable to the, until now, monotypic family Bernissartiidae. Apomorphies, including placement of the choana entirely within the pterygoids and disposition of cranial sutures demonstrate that the Isle of Wight skull cannot be referred to Bernissartia fagesii, known from contemporaneous strata. Furthermore, these characters indicate that the specimen should not be referred to a new species of Bernissartia. It is therefore placed in a new genus and species, Koumpiodontosuchus aprosdokiti. The systematic position of Bernissartiidae, and characters used to diagnose Eusuchia, including placement of the choana(e) within the prerygoids, are discussed. Until recently this condition was thought to be restricted to Eusuchia with all non-eusuchian neosuchian crorocdiliforms possessing choanae bounded posteriorly by the pterygoids and anteriorly by the palatines. While the choana of Koumpiodontosuchus aprosdokiti gen. et sp. nov. is entirely bounded by the pterygoids it differs from the choanae of eusuchians in lacking a median septum, being anteroposteriorly elongate and in its anterior placement.

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Accepted/In Press date: 28 February 2014
e-pub ahead of print date: 11 March 2014
Published date: 1 June 2015
Keywords: Barremian, Bernissartiidae, Cretaceous, Crocodyliformes, England, Eusuchia, Neosuchia, Wealden

Identifiers

Local EPrints ID: 423000
URI: http://eprints.soton.ac.uk/id/eprint/423000
ISSN: 0567-7920
PURE UUID: b62dbd5f-f18d-4370-a6a6-5e55d85e12af
ORCID for Steven U. Vidovic: ORCID iD orcid.org/0000-0002-4726-8018

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Date deposited: 09 Aug 2018 16:30
Last modified: 08 Oct 2019 00:23

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Contributors

Author: Steven C. Sweetman
Author: Ulysse Pedreira-Segade
Author: Steven U. Vidovic ORCID iD

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