A new upper jurassic ophthalmosaurid ichthyosaur from the Slottsmøya Member, Agardhfjellet formation of central Spitsbergen.

Abundant new ichthyosaur material has recently been documented in the Slottsmøya Member of the Agardhfjellet Formation from the Svalbard archipelago of Norway. Here we describe a partial skeleton of a new taxon, Janusaurus lundi, that includes much of the skull and representative portions of the pos...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Aubrey Jane Roberts, Patrick Scott Druckenmiller, Glenn-Peter Sætre, Jørn Harald Hurum
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bdb3f73658154bf8bbc40433959d7517
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:bdb3f73658154bf8bbc40433959d7517
record_format	dspace
spelling	oai:doaj.org-article:bdb3f73658154bf8bbc40433959d75172021-11-25T06:06:15ZA new upper jurassic ophthalmosaurid ichthyosaur from the Slottsmøya Member, Agardhfjellet formation of central Spitsbergen.1932-620310.1371/journal.pone.0103152https://doaj.org/article/bdb3f73658154bf8bbc40433959d75172014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25084533/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Abundant new ichthyosaur material has recently been documented in the Slottsmøya Member of the Agardhfjellet Formation from the Svalbard archipelago of Norway. Here we describe a partial skeleton of a new taxon, Janusaurus lundi, that includes much of the skull and representative portions of the postcranium. The new taxon is diagnosed by a suite of cranial character states including a very gracile stapedial shaft, the presence of a dorsal process on the prearticular and autapomorphic postcranial features such as the presence of an interclavicular trough and a conspicuous anterodorsal process of the ilium. The peculiar morphology of the ilia indicates a previously unrecognized degree of morphological variation in the pelvic girdle of ophthalmosaurids. We also present a large species level phylogenetic analysis of ophthalmosaurids including new and undescribed ichthyosaur material from the Upper Jurassic of Svalbard. Our results recover all Svalbard taxa in a single unresolved polytomy nested within Ophthalmosaurinae, which considerably increases the taxonomic composition of this clade. The paleobiogeographical implications of this result suggest the presence of a single clade of Boreal ophthalmosaurid ichthyosaurs that existed during the latest Jurassic, a pattern also reflected in the high degree of endemicity among some Boreal invertebrates, particularly ammonoids. Recent and ongoing descriptions of marine reptiles from the Slottsmøya Member Lagerstätte provide important new data to test hypotheses of marine amniote faunal turnover at the Jurassic-Cretaceous boundary.Aubrey Jane RobertsPatrick Scott DruckenmillerGlenn-Peter SætreJørn Harald HurumPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 8, p e103152 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Aubrey Jane Roberts Patrick Scott Druckenmiller Glenn-Peter Sætre Jørn Harald Hurum A new upper jurassic ophthalmosaurid ichthyosaur from the Slottsmøya Member, Agardhfjellet formation of central Spitsbergen.
description	Abundant new ichthyosaur material has recently been documented in the Slottsmøya Member of the Agardhfjellet Formation from the Svalbard archipelago of Norway. Here we describe a partial skeleton of a new taxon, Janusaurus lundi, that includes much of the skull and representative portions of the postcranium. The new taxon is diagnosed by a suite of cranial character states including a very gracile stapedial shaft, the presence of a dorsal process on the prearticular and autapomorphic postcranial features such as the presence of an interclavicular trough and a conspicuous anterodorsal process of the ilium. The peculiar morphology of the ilia indicates a previously unrecognized degree of morphological variation in the pelvic girdle of ophthalmosaurids. We also present a large species level phylogenetic analysis of ophthalmosaurids including new and undescribed ichthyosaur material from the Upper Jurassic of Svalbard. Our results recover all Svalbard taxa in a single unresolved polytomy nested within Ophthalmosaurinae, which considerably increases the taxonomic composition of this clade. The paleobiogeographical implications of this result suggest the presence of a single clade of Boreal ophthalmosaurid ichthyosaurs that existed during the latest Jurassic, a pattern also reflected in the high degree of endemicity among some Boreal invertebrates, particularly ammonoids. Recent and ongoing descriptions of marine reptiles from the Slottsmøya Member Lagerstätte provide important new data to test hypotheses of marine amniote faunal turnover at the Jurassic-Cretaceous boundary.
format	article
author	Aubrey Jane Roberts Patrick Scott Druckenmiller Glenn-Peter Sætre Jørn Harald Hurum
author_facet	Aubrey Jane Roberts Patrick Scott Druckenmiller Glenn-Peter Sætre Jørn Harald Hurum
author_sort	Aubrey Jane Roberts
title	A new upper jurassic ophthalmosaurid ichthyosaur from the Slottsmøya Member, Agardhfjellet formation of central Spitsbergen.
title_short	A new upper jurassic ophthalmosaurid ichthyosaur from the Slottsmøya Member, Agardhfjellet formation of central Spitsbergen.
title_full	A new upper jurassic ophthalmosaurid ichthyosaur from the Slottsmøya Member, Agardhfjellet formation of central Spitsbergen.
title_fullStr	A new upper jurassic ophthalmosaurid ichthyosaur from the Slottsmøya Member, Agardhfjellet formation of central Spitsbergen.
title_full_unstemmed	A new upper jurassic ophthalmosaurid ichthyosaur from the Slottsmøya Member, Agardhfjellet formation of central Spitsbergen.
title_sort	new upper jurassic ophthalmosaurid ichthyosaur from the slottsmøya member, agardhfjellet formation of central spitsbergen.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/bdb3f73658154bf8bbc40433959d7517
work_keys_str_mv	AT aubreyjaneroberts anewupperjurassicophthalmosauridichthyosaurfromtheslottsmøyamemberagardhfjelletformationofcentralspitsbergen AT patrickscottdruckenmiller anewupperjurassicophthalmosauridichthyosaurfromtheslottsmøyamemberagardhfjelletformationofcentralspitsbergen AT glennpetersætre anewupperjurassicophthalmosauridichthyosaurfromtheslottsmøyamemberagardhfjelletformationofcentralspitsbergen AT jørnharaldhurum anewupperjurassicophthalmosauridichthyosaurfromtheslottsmøyamemberagardhfjelletformationofcentralspitsbergen AT aubreyjaneroberts newupperjurassicophthalmosauridichthyosaurfromtheslottsmøyamemberagardhfjelletformationofcentralspitsbergen AT patrickscottdruckenmiller newupperjurassicophthalmosauridichthyosaurfromtheslottsmøyamemberagardhfjelletformationofcentralspitsbergen AT glennpetersætre newupperjurassicophthalmosauridichthyosaurfromtheslottsmøyamemberagardhfjelletformationofcentralspitsbergen AT jørnharaldhurum newupperjurassicophthalmosauridichthyosaurfromtheslottsmøyamemberagardhfjelletformationofcentralspitsbergen
_version_	1718414187471831040

A new upper jurassic ophthalmosaurid ichthyosaur from the Slottsmøya Member, Agardhfjellet formation of central Spitsbergen.

Ejemplares similares