[dinosaur] Colhuehuapisuchus, New Peirosaurid Crocodyliform from Upper Cretaceous of Argentina

Ben Creisler
[email protected]

A new paper:

Colhuehuapisuchus lunai, gen. et sp. nov.

Matthew C. Lamanna, Gabriel A. Casal, Lucio M. Ibiricu & Rubén D. F.
Martínez (2019)
A New Peirosaurid Crocodyliform from the Upper Cretaceous Lago Colhué Huapi
Formation of Central Patagonia, Argentina.
Annals of the Carnegie Museum 85(3): 193-211
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.2992_007.085.0301&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=-BlBKpbve1uWRdZ4u51NHECylRAllyZOi3a5Cp5ZFVk&s=RX7zZ_3iTx9L3_TtDIxPTMEVEbncITBJjNChIlFHjWQ&e= 
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Peirosaurid crocodyliforms were diverse and abundant in the Cretaceous of
the Gondwanan landmasses, especially South America. Here, we describe
Colhuehuapisuchus lunai, gen. et sp. nov., a new peirosaurid taxon from the
Upper Cretaceous (Campanian–?lower Maastrichtian) Lago Colhué Huapi
Formation of southern Chubut Province in central Patagonia, Argentina.
Although represented by only the anterior ∼one-third of the mandible with
several complete, in situ teeth, the new taxon exhibits a combination of
distinctive morphologies that does not occur in other peirosaurids,
including several mandibular and dental autapomorphies. The symphyseal
region of the Colhuehuapisuchus mandible is transversely wider than that of
any other representative of Peirosauridae, and as such the new form may be
most closely related to other broad-snouted peirosaurids such as
Barrosasuchus neuquenianus, Gasparinisuchus peirosauroides, and
Patagosuchus anielensis. The exceptional diversity of snout and tooth
shapes among definitive and probable members of Peirosauridae suggests the
existence of a variety of ecological and dietary preferences within the
clade. Colhuehuapisuchus constitutes the southernmost peirosaurid
occurrence worldwide and arguably the youngest record from Patagonia,
thereby expanding the paleobiogeographic range of these distinctive
mesoeucrocodylians to nearly the end of the Mesozoic and the southern tip
of South America.

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