[dinosaur] Jurassic marine reptiles from Poland + Cretaceous teleosauroid from Colombia

Ben Creisler
[email protected]

Some recent papers:

Daniel Tyborowski & Błażej Błażejowski (2019)
New marine reptile fossils from the Late Jurassic of Poland with
implications for vertebrate faunas palaeobiogeography.
Proceedings of the Geologists' Association (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.pgeola.2019.09.004&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=UgJ2G5j3umGHfzrP2OF0gVr4N0FtNRDx8lJK1wM8CKA&s=Z5Bps7YVl-haJaYze8JFGIZ_SmEG10eRqX8x7qJENbQ&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencedirect.com_science_article_abs_pii_S0016787819301063&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=UgJ2G5j3umGHfzrP2OF0gVr4N0FtNRDx8lJK1wM8CKA&s=2zFxfEQCdmZac04Ib7Iq01CAWzpsO9GhGtP2x6LzeIQ&e= 


A new marine vertebrate assemblage from the Late Jurassic (late
Kimmeridgian) at Krzyżanowice near Iłża in the NE margin of the Holy Cross
Mountains in Poland is described. This new locality is rich in fossils of
coastal and pelagic reptiles. The most frequent fossils are plesiochelyid
turtle shell fragments and pliosaurid skull bones and teeth. The
Krzyżanowice vertebrate assemblage is similar to the Late Jurassic
Boreal/Sub-Boreal localities of the Kimmeridge Clay in Great Britain and
Svalbard Archipelago in the Arctic, in the presence of pliosaurids and
long-necked plesiosaurids. However, plesiochelyid turtles and
crocodylomorphs are similar to those from the
Mediterranean/Sub-Mediterranean sites of the northern border of the Tethys
Ocean, as, for example, in the Swiss Jura Mountains and Southern Germany.
This unique composition of the Krzyżanowice vertebrate fauna demonstrates
that, during the Late Jurassic this new locality was located in the
transitional palaeobiogeographic line referred to in this paper as the
"Matyja-Wierzbowski Line". The new palaeobiogeographical reconstructions of
Late Jurassic of Europe are based on the composition of the Krzyżanowice
locality and other sites with similar turtle-pliosaurid faunas which formed
a long-term, stable ecological sympatry in marine ecosystems of the
European Archipelago.

=====


Dirley Cortes, Hans C.E. Larsson, Erin E. Maxwell, Mary L. Parra Ruge,
Pedro Patarroyo & Jeffrey A. Wilson (2019)
An Early Cretaceous teleosauroid (Crocodylomorpha: Thalattosuchia) from
Colombia.
Ameghiniana (advance online publication)
doi: 10.5710/AMGH.26.09.2019.3269
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.ameghiniana.org.ar_index.php_ameghiniana_article_view_1041&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=UgJ2G5j3umGHfzrP2OF0gVr4N0FtNRDx8lJK1wM8CKA&s=_E0Aw7eOrAM2-s8WOspY5hHlq5fZpOQIabf7cjQeetw&e= 


Teleosauroid extinction at the J/K boundary has been hypothesized to be an
artifact of sampling only temperate paleolatitudes. Here, we describe the
definitive youngest record of Teleosauroidea, from the upper Barremian of
the paleotropics. The preserved material consists of dorsal vertebrae,
dorsal ribs, dorsal and ventral osteoderms and epipodial remains. We refer
the specimen to Teleosauroidea based on the large hourglass-shaped
amphiplatyan morphology of the dorsal centra and rectangular dorsal
osteoderms, which are much wider than long and have a straight anterior
edge. The South American specimen is one of the largest known
teleosauroids, with an estimated body length of 9.6 m. This is the first
evidence of a marine crocodylomorph recorded from the Paja Formation of
Colombia. The survival of Teleosauroidea in the paleotropics of northern
Gondwana following the group’s extinction in Europe supports the hypothesis
that water temperature played a role in controlling the diversity and
distribution of these large marine predators.


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