title: On the presence of the subnarial foramen in Prestosuchus chiniquensis (Pseudosuchia: Loricata) with remarks on its phylogenetic distribution.
abstract: Many authors have discussed the subnarial foramen in Archosauriformes. Here presence among Archosauriformes, shape, and position of this structure is reported and its phylogenetic importance is investigated. Based on distribution and the phylogenetic tree, it probably arose independently in Erythrosuchus, Herrerasaurus, and Paracrocodylomorpha. In Paracrocodylomorpha the subnarial foramen is oval-shaped, placed in the middle height of the main body of the maxilla, and does not reach the height of ascending process. In basal loricatans from South America (Prestosuchus chiniquensis and Saurosuchus galilei) the subnarial foramen is 'drop-like' shaped, the subnarial foramen is located above the middle height of the main body of the maxilla, reaching the height of ascending process, a condition also present in Herrerasaurus ischigualastensis. These results suggest that this structure might be phylogenetically important and further investigation with a large set of valid taxa is necessary to properly evaluate its importance among Archosauria.
authors: Programa de Pós-Graduação em Biodiversidade Animal, Universidade Federal de , Av. Roraima, 1000, Bairro Camobi, 97105-900 Santa Maria, RS, Brasil.|Laboratório de Paleontologia, Universidade Luterana do Brasil, Av. Farroupilha, 8001, Bairro São José, 92425-900 Canoas, RS, Brasil.
authors: Lúcio
authors: L
authors: Roberto-DA-Silva
authors: Laboratório de Paleontologia e Evolução de Petrolina, Campus de Ciências Agrárias, Universidade Federal do Vale do São Francisco, Rodovia BR 407, Km12, Lote 543, 56300-000 Petrolina, PE, Brasil.
authors: Marco A G
authors: MA
authors: França
authors: Laboratório de Paleontologia e Evolução de Petrolina, Campus de Ciências Agrárias, Universidade Federal do Vale do São Francisco, Rodovia BR 407, Km12, Lote 543, 56300-000 Petrolina, PE, Brasil.
authors: Sérgio F
authors: SF
authors: Cabreira
authors: Programa de Pós-Graduação em Biodiversidade Animal, Universidade Federal de , Av. Roraima, 1000, Bairro Camobi, 97105-900 Santa Maria, RS, Brasil.
authors: Rodrigo T
authors: RT
authors: Müller
authors: Centro de Apoio à Pesquisa da Quarta Colônia, Universidade Federal de Santa Maria, Rua Maximiliano Vizzotto, 598, 97230-000 São João do Polêsine, RS, Brasil.
authors: Sérgio
authors: S
authors: Dias-DA-Silva
mesh_terms: D000489:Alligators and Crocodiles / Q000033:anatomy & histology* / Q000145:classification*; D000818:Animals; D010163:Paleontology; D010802:Phylogeny; D013020:South America