Abstract
The mesoeucrocodylian record from the Bauru Group (Paraná Basin, Brazil) comes from three formations: Adamantina (Late Turonian-Early Maastrichtian), Presidente Prudente (Early Campanian-Early Maastrichtian) and Marília (Maastrichtian). These records are restricted to the Early Coniacian-Early Maastrichtian. Here, we report a new crocodyliform record from the Bauru Group, which was the first of the Araçatuba Formation, from a new locality of Coronel Goulart district, in Álvares Machado municipality. Coronelsuchus civali gen. nov. et sp. nov. comprises two related specimens - FFP PG 13 and FFP PG 14 recovered close to each other and on the same muddy sandstone level. We perform a phylogenetic analysis with 392 characters (five new added) and 88 taxa. Our analyses supported the new clades: Sphagesauria, Sphagesaurinae and Caipirasuchinae. Our phylogenetic results suggest C. civali as a basal Sphagesauria. Regarding the Crocodyliform Assemblage Zones (CAZ), the new species is correlated to the CAZ 1, together with small sphagesaurians, Caryonosuchus and itasuchids. The C. civali reveals an older appearing (pre-Turonian) and diversification of Sphagesauria. The specimens also expand the stratigraphic range for Notosuchia in the Bauru Group.
Highlights
The Bauru Group is the most extensive sedimentary sequence of the Upper Cretaceous in South America (Fernandes & Coimbra 1996a), yielding a diverse and abundant vertebrate fossil content (e.g., Bandeira et al 2018)
We report a sphagesaurian (Notosuchia) from Bauru Group, which was found in the top muddy-sandstones sequence of the Araçatuba Formation (Fernandes et al 2003)
The consensus tree lacks resolution to Coronelsuchus civali within Notosuchia, our analysis indicates that it is a basal member of Sphagesauria (Figure 9a)
Summary
The Bauru Group is the most extensive sedimentary sequence of the Upper Cretaceous in South America (Fernandes & Coimbra 1996a), yielding a diverse and abundant vertebrate fossil content (e.g., Bandeira et al 2018). The diversity of Adamantina Formation to mesoeucrocodylians is remarkable, with 21 among around thirty species to all Bauru Group, corresponding to the second major pulse of notosuchian diversification during Turonian – Santonian (Pol & Leardi 2015, Celis et al 2020). We report a sphagesaurian (Notosuchia) from Bauru Group, which was found in the top muddy-sandstones sequence of the Araçatuba Formation (Fernandes et al 2003). This record consists of two specimens - FFP PG 13 and FFP.
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