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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A new caimanine (Crocodylia, Alligatoroidea) species from the Solimoes Formation of Brazil and the phylogeny of Caimaninae

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Author(s):
Souza-Filho, Jonas P. [1] ; Souza, Rafael G. [2] ; Hsiou, Annie Schmaltz [3] ; Riff, Douglas [4] ; Guilherme, Edson [1] ; Negri, Francisco Ricardo [5] ; Cidade, Giovanne M. [3]
Total Authors: 7
Affiliation:
[1] Univ Fed Acre, Lab Paleontol, BR-69915900 Rio Branco, Acre - Brazil
[2] Univ Fed Rio de Janeiro, Museu Nacl, Dept Geol & Paleontol, Lab Sistemat & Tafon Vertebrados Fosseis, BR-20940040 Rio De Janeiro, RJ - Brazil
[3] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Biol, Lab Paleontol, BR-14040901 Ribeirao Preto, SP - Brazil
[4] Univ Fed Uberlandia, Inst Biol, Lab Paleontol, BR-38400902 Uberlandia, MG - Brazil
[5] Univ Fed Acre, Lab Paleontol, Campus Floresta, BR-69980000 Cruzeiro Do Sul, Acre - Brazil
Total Affiliations: 5
Document type: Journal article
Source: JOURNAL OF VERTEBRATE PALEONTOLOGY; v. 38, n. 5 SEP 3 2018.
Web of Science Citations: 3
Abstract

The Miocene deposits of South America are notable for their diverse crocodyliform fauna, of which the giant caimanine Purussaurus is a well-known example. This contribution describes a new caimanine, Acresuchus pachytemporalis, gen. et sp. nov., based on an almost complete skull and mandible from the late Miocene Solimoes Formation of the southwestern Brazilian Amazonia. This new taxon is based on a unique combination of characters, of which the presence of an upturned posterolateral margin of the squamosal throughout the entire lateral margin of the bone (a horn'), with a dorsoventral expansion in the posterior portion of the eminence, stands out. We conducted a phylogenetic analysis of Eusuchia, which showed the new taxon as sister to Purussaurus. This placement allows discussion about the evolution of gigantism in the Acresuchus-Purussaurus clade, which reveals several characters that may be related to gigantism. Additionally, Acresuchus was probably a medium-sized generalist caimanine that had an ecological niche similar to the extant Melanosuchus niger. Until now, crocodyliforms that had such niches were unknown from the Solimoes Formation. (AU)

FAPESP's process: 11/14080-0 - Cretaceous and Tertiary (Paleogene/Neogene) Squamates (Reptilia, Lepidosauria) from the Bauru, Aiuruoca and Acre basins: systematics, evolution and palaeoenvironments
Grantee:Annie Schmaltz Hsiou
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 13/04516-1 - Syatematic Revision of the Mourasuchus genus (Alligatoroidea, Caimaninae), one of the most peculiar crocodiles of the world
Grantee:Giovanne Mendes Cidade
Support Opportunities: Scholarships in Brazil - Master