[dinosaur] Eomadtsoia, new madtsoiid snake from Cretaceous of Argentina (correction)+ Axestemys infernalis new Cretaceous turtle species

Correcting the name to Eomadtsoia...

My bad....

On Tue, Nov 19, 2019 at 5:51 PM Ben Creisler <[email protected]> wrote:

>
> Ben Creisler
> [email protected]
>
> Some recent non-dino papers:
>
> Eomadtsoia ragei gen. nov.
>
> Raúl O. Gómez, Fernando F. Garberoglio & Guillermo W. Rougier (2019)
> A new Late Cretaceous snake from Patagonia: Phylogeny and trends in body
> size evolution of madtsoiid snakes.
> Comptes Rendus Palevol (advance online publication)
> doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.crpv.2019.09.003&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=uJYpYAlRAfanr_8WPp2SCwbsGzI5Pvr1ddPBJXw2t5A&s=JXd22xANxxRFbnNPmQ9NHv6uVSbZrnJAHpUPi-lenVE&e= 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencedirect.com_science_article_abs_pii_S1631068319301770&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=uJYpYAlRAfanr_8WPp2SCwbsGzI5Pvr1ddPBJXw2t5A&s=iJdAvFp0z6NQyMUn1tcsj2SfHX3HWNAt3fHoqDUOZw0&e= 
>
>
> Madtsoiids constitute a successful group of extinct snakes widely
> distributed across Gondwana and the European archipelago during Late
> Cretaceous times, surviving in reduced numbers to the Pleistocene. They are
> renowned for including some of the largest snakes that have ever crawled on
> earth, yet diverse small madtsoiids are also known. Uncovering the
> evolutionary trends that led these snakes into disparate body sizes has
> been hampered mainly by the lack of phylogenetic consensus and the paucity
> of taxa with novel combinations of features. Here we describe a new large
> madtsoiid snake based on isolated vertebrae from the La Colonia Formation
> (Maastrichtian–Danian) of Patagonia, Argentina. A comprehensive
> phylogenetic analysis recovers Madtsoiidae as a basal ophidian lineage and
> the new snake as sister to a clade of mostly big-to-gigantic taxa,
> providing insights into early stages and evolutionary trends towards
> madtsoiid gigantism.
>
> ====
>
> Free pdf:
>
> Axestemys infernalis sp. nov.
>
> Joyce, Walter G., Brinkman, Donald B., and Lyson, Tyler R. 2019.
> A new species of trionychid turtle, Axestemys infernalis sp. nov., from
> the Late Cretaceous (Maastrichtian) Hell Creek and Lance formations of the
> Northern Great Plains, USA.
> Palaeontologia Electronica 22.3.72 1–28.
> doi:  https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.26879_949&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=uJYpYAlRAfanr_8WPp2SCwbsGzI5Pvr1ddPBJXw2t5A&s=cyoohLVKSmblOuTe8Gt6buHIOQqLhBz3GeNdQeroqSk&e= 
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__palaeo-2Delectronica.org_content_2019_2827-2Da-2Dnew-2Dspecies-2Dof-2Dtrionychid&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=uJYpYAlRAfanr_8WPp2SCwbsGzI5Pvr1ddPBJXw2t5A&s=LAHX6Pcpv4zraPBX7JSRWRBygijmYuxHtpw6-4l6fg4&e= 
>
>
> The Late Cretaceous (Maastrichtian) Hell Creek and Lance formations in the
> states of North Dakota, South Dakota, Montana, and Wyoming, USA, have
> yielded rich remains of trionychid turtles, but the alpha taxonomy of the
> group is still poorly resolved, as most fossils are fragmentary. We here
> describe a new species of trionychid, Axestemys infernalis sp. nov., based
> on a rich assortment of skulls, shells, and postcranial remains collected
> from nine fossiliferous sites spread throughout these formations. The new
> species is attributable to the Axestemys lineage based on the combined
> presence of large size, a preneural, and a single lateral hyoplastral
> process. Axestemys infernalis sp. nov. differs from all Paleogene
> representatives of Axestemys by lacking elongate free ribs and by
> possessing costal sculpturing that reaches the margin of the shell. It
> further differs from the only other Mesozoic representative of the lineage,
> Axestemys splendidus, a species herein restricted to the Campanian, by
> possessing a rounded carapace. The available Axestemys infernalis sp. nov.
> material shows much variation, in particular in regards to the maximum size
> of individuals and the relative size of callosities, but not enough to
> warrant recognizing multiple species. Instead, this variation is likely
> caused by random drift or phenotypic variation that accrued over the course
> of the approximately 1.36 Ma represented in the Hell Creek Formation.
>
> ==
>
> Free pdf:
>
> Cretodus houghtonorum sp. nov.
>
> Kenshu Shimada & Michael J. Everhart (2019)
> A New Large Late Cretaceous Lamniform Shark from North America, with
> Comments on the Taxonomy, Paleoecology, and Evolution of the Genus Cretodus.
> Journal of Vertebrate Paleontology Article: e1673399
> doi:  https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1080_02724634.2019.1673399&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=uJYpYAlRAfanr_8WPp2SCwbsGzI5Pvr1ddPBJXw2t5A&s=B4uCYPBSBisUp2V7hJ7-92Ap6OWdoNuqBv4mLmOK0qA&e= 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.tandfonline.com_action_showAxaArticles-3FjournalCode-3Dujvp20&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=uJYpYAlRAfanr_8WPp2SCwbsGzI5Pvr1ddPBJXw2t5A&s=oyDrvCRcUNxfdjjQpl3mHLDkVKiFHD-J41Iu5sm6C9Y&e= 
>
>
> We describe a partial skeleton of the Late Cretaceous shark, Cretodus,
> collected from the Blue Hill Shale (middle Turonian) in north-central
> Kansas, U.S.A. It consists of 134 disarticulated teeth, 61 vertebrae, 23
> placoid scales, and fragments of calcified cartilage. The scale morphology
> suggests that Cretodus was a rather sluggish shark, and the vertebral
> morphology affirms its placement into Lamniformes. With a strong tendency
> towards monognathic heterodonty, the dental morphology indicates that the
> specimen belongs to a new species, C. houghtonorum, sp. nov., increasing
> the total known species of Cretodus to five. The five species can be
> divided into three distinct groups: the longiplicatus/semiplicatus-grade,
> gigantea/houghtonorum-grade, and crassidens-grade. Cretodus, that
> successively evolved by broadening the tooth crown. The individual of C.
> houghtonorum, sp. nov., is estimated to be about 515 cm in total length
> (TL). Our vertebra-based growth analysis suggests that the shark was about
> 118 cm TL at birth and that the species had an estimated maximum growth
> length of 684 cm TL. The large size at birth indicates that the
> intrauterine cannibalism behavior of embryos seen in extant lamniforms had
> already evolved by the Late Cretaceous. Where C. houghtonorum, sp. nov.,
> preferred nearshore environments, the specimen co-occurred with isolated
> teeth of Squalicorax and fragments of two dorsal fin spines of a hybodont
> shark, circumstantially indicating that the individual of Cretodus fed on
> the much smaller hybodont and was scavenged by Squalicorax.
>
> ***
> News:
>
> Fossil dig leads to unexpected discovery of 91-million-year-old shark new
> to science
>
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__phys.org_news_2019-2D11-2Dfossil-2Dunexpected-2Ddiscovery-2Dmillion-2Dyear-2Dold-2Dshark.html&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=uJYpYAlRAfanr_8WPp2SCwbsGzI5Pvr1ddPBJXw2t5A&s=KVayDydAuu0Jdzc_c8EujgGM3BeWn8SaE24-EYr-2Y0&e= 
>
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