[dinosaur] Siriusgnathus niemeyerorum as youngest South American traversodontid from Upper Triassic

Ben Creisler
[email protected]

A new paper:


Lívia Roese Miron, Ane Elise Branco Pavanatto, Flávio Augusto Pretto,
Rodrigo Temp Müller, Sérgio Dias-da-Silva & Leonardo Kerber (2019)
Siriusgnathus niemeyerorum (Eucynodontia: Gomphodontia): The youngest South
American traversodontid?
Journal of South American Earth Sciences (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.jsames.2019.102394&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=XkB1HlSoRfGIDUZ5_w2EYtlf5bWt5ET_TNshONPDVTA&s=S_Btn2wkOVtfy7l9wJFDuTyT2qR25wPml8cjAPvGVEw&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencedirect.com_science_article_pii_S0895981119304985&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=XkB1HlSoRfGIDUZ5_w2EYtlf5bWt5ET_TNshONPDVTA&s=CUOjHeYgAkg1KehPmWkEOmSo8QrFizK3de1a9uX6eGM&e= 

Highlights

New specimens of the traversodontid Siriusgnathus niemeyerorum are
described.
They represent the first records of S. niemeyerorum outside its
type-locality.
The studied sites are assigned to the Riograndia Assemblage Zone, Norian.
S. niemeyerorum may be the youngest known South American traversodontid so
far.

Abstract

Traversodontidae is a less inclusive clade of cynognathian cynodonts that
lived during the Triassic. Recently, a traversodontid from the southern
Brazilian Triassic beds was described -- Siriusgnathus niemeyerorum --
based upon specimens found exclusively in its type-locality. No absolute
age or index fossils have been reported for this locality, which prevents
an accurate biostratigraphic correlation. In the present contribution, we
describe the first specimens of S. niemeyerorum found outside its
type-locality, comprising skull portions excavated from outcrops in
southern Brazil assigned to the Caturrita Formation (upper portion of the
Candelária Sequence), Upper Triassic (Norian), Riograndia Assemblage Zone.
As a result, we provide an updated biostratigraphic framework and suggest a
Norian age for the type-locality of S. niemeyerorum, which, accordingly,
possibly comprises the youngest South American traversodontid, pending
additional geochronological studies in order to properly evaluate this
hypothesis.



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