[dinosaur] Mystriosaurus (Early Jurassic thalattosuchian) redescribed (free pdf)

Ben Creisler
[email protected]

A new paper in open access:

Sven Sachs, Michela M. Johnson, Mark T. Young, and Pascal Abel (2019)
The mystery of Mystriosaurus: Redescribing the poorly known Early Jurassic
teleosauroid thalattosuchians Mystriosaurus laurillardi and Steneosaurus
brevior.
Acta Palaeontologica Polonica 64(3): 565-579
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.4202_app.00557.2018&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=sENv-A-ClTbQ1UyrhtWxAIjpZJ7ne8CIE3q8tMQ5ISM&s=jRfwtqwrQYVccOBi_Kf6sCTcNo_jLOzJCLeppt1zB9o&e= 
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_article_item_app005572018.html&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=sENv-A-ClTbQ1UyrhtWxAIjpZJ7ne8CIE3q8tMQ5ISM&s=0rVNcgQEzo8lxqkyeao-Pon-QxjkG9cpmYGY7oLRFJY&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_archive_published_app64_app005572018.pdf&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=sENv-A-ClTbQ1UyrhtWxAIjpZJ7ne8CIE3q8tMQ5ISM&s=QrFMolox3AZ1IHjE2mKsw3iCA07v94vdeQUpSF0PgDQ&e= 

Supplementary Online Material (free pdf)
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_archive_published_SOM_app64-5F3-2DSachs-5Fetal-5FSOM.pdf&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=sENv-A-ClTbQ1UyrhtWxAIjpZJ7ne8CIE3q8tMQ5ISM&s=iRmbtXnWp4mC-Ks779zc_3yv83klf5LkOAaFIQGZTbs&e= 



The genus Mystriosaurus, established by Kaup in 1834, was one of the first
thalattosuchian genera to be named. The holotype, an incomplete skull from
the lower Toarcian Posidonienschiefer Formation of Altdorf (Bavaria,
southern Germany), is poorly known with a convoluted taxonomic history. For
the past 60 years, Mystriosaurus has been considered a subjective junior
synonym of Steneosaurus. However, our reassessment of the Mystriosaurus
laurillardi holotype demonstrates that it is a distinct and valid taxon.
Moreover, we find the holotype of "Steneosaurus" brevior, an almost
complete skull from the lower Toarcian Whitby Mudstone Formation of Whitby
(Yorkshire, UK), to be a subjective junior synonym of M. laurillardi.
Mystriosaurus is diagnosed in having: a heavily and extensively ornamented
skull; large and numerous neurovascular foramina on the premaxillae,
maxillae and dentaries; anteriorly oriented external nares; and four teeth
per premaxilla. Our phylogenetic analyses reveal M. laurillardi to be
distantly related to Steneosaurus bollensis, supporting our contention that
they are different taxa. Interestingly, our analyses hint that
Mystriosaurus may be more closely related to the Chinese teleosauroid
(previously known as Peipehsuchus) than any European form.

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