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A New Ophthalmosaurid (Ichthyosauria) from Svalbard, Norway, and Evolution of the Ichthyopterygian Pelvic Girdle

A New Ophthalmosaurid (Ichthyosauria) from Svalbard, Norway, and Evolution of the Ichthyopterygian Pelvic Girdle
A New Ophthalmosaurid (Ichthyosauria) from Svalbard, Norway, and Evolution of the Ichthyopterygian Pelvic Girdle
In spite of a fossil record spanning over 150 million years, pelvic girdle evolution in Ichthyopterygia is poorly known. Here, we examine pelvic girdle size relationships using quantitative methods and new ophthalmosaurid material from the Slottsmøya Member Lagerstätte of Svalbard, Norway. One of these new specimens, which preserves the most complete ichthyosaur pelvic girdle from the Cretaceous, is described herein as a new taxon, Keilhauia nui gen. et sp. nov. It represents the most complete Berriasian ichthyosaur known and the youngest yet described from the Slottsmøya Member. It is diagnosed on the basis of two autapomorphies from the pelvic girdle, including an ilium that is anteroposteriorly expanded at its dorsal end and an ischiopubis that is shorter or subequal in length to the femur, as well as a unique character combination. The Slottsmøya Member Lagerstätte ichthyosaurs are significant in that they represent a diverse assemblage of ophthalmosaurids that existed immediately preceding and across the Jurassic–Cretaceous boundary. They also exhibit considerable variation in pelvic girdle morphology, and expand the known range in size variation of pelvic girdle elements in the clade.
1932-6203
Delsett, Lene Liebe
281cbc30-d2b0-4eea-9990-f0c74f0330bd
Roberts, Aubrey J.
a0b4dc95-32c7-4417-8515-e24b0767c3b2
Druckenmiller, Patrick S.
14fd30f0-14b4-4d7f-b65e-e523e1cdec67
Hurum, Jørn H.
417bc987-7ec4-43e4-bf30-1b55dd6a955c
Wong, William Oki
8f85c875-0250-47ca-b17d-359a7ed26c67
Delsett, Lene Liebe
281cbc30-d2b0-4eea-9990-f0c74f0330bd
Roberts, Aubrey J.
a0b4dc95-32c7-4417-8515-e24b0767c3b2
Druckenmiller, Patrick S.
14fd30f0-14b4-4d7f-b65e-e523e1cdec67
Hurum, Jørn H.
417bc987-7ec4-43e4-bf30-1b55dd6a955c
Wong, William Oki
8f85c875-0250-47ca-b17d-359a7ed26c67

Delsett, Lene Liebe, Roberts, Aubrey J., Druckenmiller, Patrick S. and Hurum, Jørn H. , Wong, William Oki (ed.) (2017) A New Ophthalmosaurid (Ichthyosauria) from Svalbard, Norway, and Evolution of the Ichthyopterygian Pelvic Girdle. PLoS ONE, 12 (1). (doi:10.1371/journal.pone.0169971).

Record type: Article

Abstract

In spite of a fossil record spanning over 150 million years, pelvic girdle evolution in Ichthyopterygia is poorly known. Here, we examine pelvic girdle size relationships using quantitative methods and new ophthalmosaurid material from the Slottsmøya Member Lagerstätte of Svalbard, Norway. One of these new specimens, which preserves the most complete ichthyosaur pelvic girdle from the Cretaceous, is described herein as a new taxon, Keilhauia nui gen. et sp. nov. It represents the most complete Berriasian ichthyosaur known and the youngest yet described from the Slottsmøya Member. It is diagnosed on the basis of two autapomorphies from the pelvic girdle, including an ilium that is anteroposteriorly expanded at its dorsal end and an ischiopubis that is shorter or subequal in length to the femur, as well as a unique character combination. The Slottsmøya Member Lagerstätte ichthyosaurs are significant in that they represent a diverse assemblage of ophthalmosaurids that existed immediately preceding and across the Jurassic–Cretaceous boundary. They also exhibit considerable variation in pelvic girdle morphology, and expand the known range in size variation of pelvic girdle elements in the clade.

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More information

e-pub ahead of print date: 25 January 2017
Published date: 25 January 2017

Identifiers

Local EPrints ID: 418161
URI: http://eprints.soton.ac.uk/id/eprint/418161
ISSN: 1932-6203
PURE UUID: d0dbe763-7e82-4175-ba25-753f5f4141ec

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Date deposited: 23 Feb 2018 17:30
Last modified: 07 Jan 2022 22:51

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Contributors

Author: Lene Liebe Delsett
Author: Aubrey J. Roberts
Author: Patrick S. Druckenmiller
Author: Jørn H. Hurum
Editor: William Oki Wong

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