[dinosaur] Lagosuchus (Dinosauriformes) validity (= Marasuchus) (free pdf)

Ben Creisler
[email protected]

A new paper with free pdf link:


Federico L. Agnolin & Martín D. Ezcurra (2019)
The validity of Lagosuchus talampayensis Romer, 1971 (Archosauria,
Dinosauriformes), from the Late Triassic of Argentina.
Breviora, 565(1):1-21
doi:  https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.3099_0006-2D9698-2D565.1.1&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3nLRzZj3IVUXcu4rfcFvTiy7tG8p4-GtD9YOEuaEbLo&s=ffI0-Nl7QBtXyjol5agiGsW2tviZB2wzDNYJ9-LpW-g&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__bioone.org_journals_Breviora_volume-2D565_issue-2D1_0006-2D9698-2D565.1.1_THE-2DVALIDITY-2DOF-2DLAGOSUCHUS-2DTALAMPAYENSIS-2DROMER-2D1971-2DARCHOSAURIA-2DDINOSAURIFORMES-2DFROM_10.3099_0006-2D9698-2D565.1.1.short&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3nLRzZj3IVUXcu4rfcFvTiy7tG8p4-GtD9YOEuaEbLo&s=st69xaP0Gd6dRWGGgUOPo8_7AJo_domhGKUf3X6xdtg&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=https-3A__mczbase.mcz.harvard.edu_specimen-5Fimages_publications_Breviora-5F565.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3nLRzZj3IVUXcu4rfcFvTiy7tG8p4-GtD9YOEuaEbLo&s=6shu4lYtetDo5-Hj5Ikxq4wBgQkeS7MGfKat3kV7IHA&e= 


The Chañares Formation (latest Middle–earliest Late Triassic) of
northwestern Argentina is part of the Ischigualasto–Villa Unión Basin and
preserves a rich fossil vertebrate record discovered by a crew of the
Museum of Comparative Zoology (Harvard University) led by Alfred Romer. A
diverse non-dinosaurian dinosauromorph assemblage has been described from
this formation and includes the iconic, small-sized "proto-dinosaur"
Lagosuchus talampayensis Romer, 1971. This species has been crucial to
understand the body plan of dinosaur precursors and the higher-level
phylogenetic relationships of dinosaurs. More recently, authors considered
this genus and species as nomina dubia. The aim of this contribution is to
reassess the taxonomic validity of L. talampayensis. New observations
indicate that the holotype of L. talampayensis differs from other
avemetatarsalians, but not from the hypodigm of Marasuchus lilloensis, in
the presence of a globose femoral head (strongly convex proximal and medial
surfaces) with a distinctly dorsal orientation and a sub-oval outline in
proximal view as a result of incipient posterior and posteromedial
tuberosities. Thus, Lagosuchus talampayensis is here considered a senior
synonym of "Marasuchus lilloensis" (Romer, 1972). Our conclusions have
implications in the knowledge about early dinosauromorph diversity and the
taxonomic richness of the group in the Chañares Formation.

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