[dinosaur] Ichthyosaurs from Late Jurassic of Svalbard (free pdf)

Ben Creisler
[email protected]

A new paper in open access:


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Lene L. Delsett, Aubrey J. Roberts, Patrick S. Druckenmiller, and Jørn H.
Hurum (2019)
Osteology and phylogeny of Late Jurassic ichthyosaurs from the Slottsmøya
Member Lagerstätte (Spitsbergen, Svalbard).
Acta Palaeontologica Polonica (in press)
doi:https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.4202_app.00571.2018&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=MOp6_w5l4zWK3CaRQUZ4nPRLj-96jjLW-GI_6ndrWno&s=RfA-BFud3-S866Up8nkXfza0HKLdmwdep1mlbDNHobU&e= 
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_article_item_app005712018.html&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=MOp6_w5l4zWK3CaRQUZ4nPRLj-96jjLW-GI_6ndrWno&s=TZjTI4Dg82GMzC29HE5SDPN2ws4VQB9WCeF65x-50HA&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_archive_published_app64_app005712018.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=MOp6_w5l4zWK3CaRQUZ4nPRLj-96jjLW-GI_6ndrWno&s=cfJRVmgyxjwxLLt-PxCngJOTm2fn8mCTpEJygjMk_i0&e= 

Supplementary info:
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_archive_published_SOM_app64-2DDelsett-5Fetal-5FSOM.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=MOp6_w5l4zWK3CaRQUZ4nPRLj-96jjLW-GI_6ndrWno&s=GZOKDMBYX4ZTTL2jjfTPBX6080SM4k97miXODaZnrv4&e= 


Phylogenetic relationships within the important ichthyosaur family
Ophthalmosauridae are not well established, and more specimens and
characters, especially from the postcranial skeleton, are needed. Three
ophthalmosaurid specimens from the Tithonian (Late Jurassic) of the
Slottsmøya Member Lagerstätte on Spitsbergen, Svalbard, are described. Two
of the specimens are new and are referred to Keilhauia sp. and
Ophthalmosauridae indet. respectively, whereas the third specimen consists
of previously undescribed basicranial elements from the holotype of
Cryopterygius kristiansenae. The species was recently synonymized with the
Russian Undorosaurus gorodischensis, but despite many similarities, we
conclude that there are too many differences, for example in the shape of
the stapedial head and the proximal head of the humerus; and too little
overlap between specimens, to warrant synonymy on species level. A
phylogenetic analysis of Ophthalmosauridae is conducted, including all
Slottsmøya Member specimens and new characters. The two proposed
ophthalmosaurid clades, Ophthalmosaurinae and Platypterygiinae, are
retrieved under some circumstances, but with little support. The synonymy
of three taxa from the Slottsmøya Member Lagerstätte with Arthropterygius
is not supported by the present evidence.

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