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An Ichthyosaurus breviceps collected by Mary Anning; new information on the species

Judy A. Massare and Dean R. Lomax
An Ichthyosaurus breviceps collected by Mary Anning; new information on the species (in New perspectives on ancient marine reptiles, Benjamin P. Kear (editor) and Graham E. Budd (editor))
Geological Magazine (January 2014) 151 (1): 21-28

Abstract

An ichthyosaur in the collections of the Sedgwick Museum, Cambridge (CAMSMX.50187) was collected in the nineteenth century by the renowned fossil collector Mary Anning, but has never been adequately described in the literature. As an Anning specimen, it is certainly from the Lower Jurassic of Lyme Regis, west Dorset. The near complete presacral skeleton is lying on its left side and includes a complete skull, one complete and one partial forefin, pectoral bones, all six elements of the pelvic girdle, and both hindfins. The centra in the anterior caudal region, however, are from another individual and may have replaced the original ones. The specimen is identified as Ichthyosaurus based on the morphology of the humerus and forefin. It is assigned to I. breviceps on the basis of the relatively short snout, large eye, and tall neural spines. This is the only known specimen of I. breviceps to preserve a complete pelvis. Notably, the ilium is longer than the pubis and ischium, and the pubis is longer than the ischium. This individual is the largest I. breviceps reported in the literature, with jaw length of 33.5 cm and estimated length from snout to tail bend of 1.6 m.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 151
Serial Issue: 1
Title: An Ichthyosaurus breviceps collected by Mary Anning; new information on the species
Title: New perspectives on ancient marine reptiles
Author(s): Massare, Judy A.Lomax, Dean R.
Author(s): Kear, Benjamin P.editor
Author(s): Budd, Graham E.editor
Affiliation: SUNY College at Brockport, Department of the Earth Sciences, Brockport, NY, United States
Affiliation: Uppsala University, Department of Earth Sciences, Uppsala, Sweden
Pages: 21-28
Published: 201401
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 14
Accession Number: 2014-027298
Categories: Vertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N50°40'00" - N50°49'60", W03°00'00" - W02°55'00"
Secondary Affiliation: Doncaster Museum and Art Gallery, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201417
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