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Article: Two new species of Ichthyosaurus from the lowermost Jurassic (Hettangian) of Somerset, England

Papers in Palaeontology - Volume 3 Part 1 - Cover
Publication: Palaeontology
Volume: 3
Part: 1
Publication Date: Febuary 2017
Page(s): 1 20
Author(s): Dean R. Lomax, and Judy A. Massare
DOI: 10.1002/spp2.1065
Addition Information

How to Cite

LOMAX, D.R., MASSARE, J.A. 2017. Two new species of Ichthyosaurus from the lowermost Jurassic (Hettangian) of Somerset, England. Papers in Palaeontology, 3, 1, 1-20. DOI: 10.1002/spp2.1065

Author Information

  • Dean R. Lomax - School of Earth, Atmospheric & Environmental Sciences The University of Manchester Manchester UK (Email: dean.lomax@manchester.ac.uk)
  • Judy A. Massare - Department of Earth Sciences SUNY College at Brockport Brockport NY USA (Email: jmassare@brockport.edu)

Publication History

  • Manuscript Accepted: 13 September 2016
  • Manuscript Received: 10 April 2016

Funded By

SUNY Brockport
Professional Development Grant from United University Professions (UUP)

Online Version Hosted By

Wiley Online Library
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Abstract

All specimens of Ichthyosaurus from the Lower Jurassic of Somerset were previously identified as I. communis, an abundant and extremely variable species. Here, two new species of Ichthyosaurus are recognized from multiple specimens. The species are assigned to Ichthyosaurus on the basis of the humerus, pectoral girdle and forefin morphologies. I. larkini sp. nov. is distinguished by a broad jugal with a blunt anterior end that extends as far forward as the middle of the external naris, separating the maxilla and lacrimal; and a unique combination of other features. I. somersetensis sp. nov. is distinguished by a jugal with a nearly straight dorsal ramus that lacks a right‐angle dorsal bend; a high, narrow, crescentic postorbital that forms almost all of the posterior margin of the orbit and separates the jugal dorsal ramus from the orbit; and an ilium that is wide relative to its length, more oblong than rib‐like. The identifications are supported by a phylogenetic analysis which finds the new species more closely related to each other than to other species of the genus. We also identify a squamosal in both species, which confirms that it is present in the genus. This study suggests that hindfin morphology has some taxonomic utility, at least within the genus. The new species increases the diversity of Ichthyosaurus to six species, three of which are found in the Hettangian of Somerset.

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