[dinosaur] Two new stegosaur specimens from Jurassic Morrison Formation of Montana (free pdf)

Ben Creisler
[email protected]


A new paper in open access:


D. Cary Woodruff, David Trexler, and Susannah C.R. Maidment (2019)
Two new stegosaur specimens from the Upper Jurassic Morrison Formation of
Montana, USA.
Acta Palaeontologica Polonica (in press)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.4202_app.00585.2018&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=4FNnXj7kJcoN3cS8E4op9cM1UhuXNxNfc0EvMabl3bg&s=CBt3LrBT28mTb-GxR8GEEPtLhzdrDhTCsDcKzNbMSgc&e= 
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_article_item_app005852018.html&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=4FNnXj7kJcoN3cS8E4op9cM1UhuXNxNfc0EvMabl3bg&s=n_FuPSQAir2MTwtfpXKbcvk7Bq0Gf2BwQAD7dXEMHVw&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_archive_published_app64_app005852018.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=4FNnXj7kJcoN3cS8E4op9cM1UhuXNxNfc0EvMabl3bg&s=EHfoLbvgpBvnIkiDYExSVWpHvk6ixaGwJjPFvU69WxQ&e= 


Two partial skeletons from Montana represent the northernmost occurrences
of Stegosauria within North America. One of these specimens represents the
northernmost dinosaur fossil ever recovered from the Morrison Formation.
Consisting of fragmentary cranial and postcranial remains, these specimens
are contributing to our knowledge of the record and distribution of
dinosaurs within the Morrison Formation from Montana. While the stegosaurs
of the Morrison Formation consist of Alcovasaurus, Hesperosaurus, and
Stegosaurus, the only positively identified stegosaur from Montana thus far
is Hesperosaurus. Unfortunately, neither of these new specimens exhibit
diagnostic autapomorphies. Nonetheless, these specimens are important data
points due to their geographic significance, and some aspects of their
morphologies are striking. In one specimen, the teeth express a high degree
of wear usually unobserved within this clade—potentially illuminating the
progression of the chewing motion in derived stegosaurs. Other
morphologies, though not histologically examined in this analysis, have the
potential to be important indicators for maturational inferences. In suite
with other specimens from the northern extent of the formation, these
specimens contribute to the ongoing discussion that body size may be
latitudinally significant for stegosaurs—an intriguing geographical
hypothesis which further emphasizes that size is not an undeviating proxy
for maturity in dinosaurs.


<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Dwebmail&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=4FNnXj7kJcoN3cS8E4op9cM1UhuXNxNfc0EvMabl3bg&s=qd-2CEt8-bLfblqW7jWOEbck0UfIb3S2Ym_Ep1852yE&e= >
Virus-free.
www.avg.com
<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Dwebmail&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=4FNnXj7kJcoN3cS8E4op9cM1UhuXNxNfc0EvMabl3bg&s=qd-2CEt8-bLfblqW7jWOEbck0UfIb3S2Ym_Ep1852yE&e= >
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>