title: A new species of Equinoxiodus (Dipnoi: ?Neoceratodontidae) from the Late Cretaceous of Brazil.
abstract: A noteworthy diversity of Dipnoi tooth plates has been collected in the fossiliferous conglomerates of the Alcântara Formation, early Cenomanian (Cretaceous) of Brazil. This sequence was deposited under transitional (estuarine) conditions, gathering reworked dissociated fossils represented by plants, fishes, crocodylomorphs, pterosaurs and dinosaurs. A new species of Dipnoi is reported in this work, Equinoxiodus schultzei sp. nov. whose genus is endemic of northern South America and lived probably in fresh water. The presence of several species of dipnoan in the mid-Cretaceous of north/northeastern Brazil indicates that the environmental conditions were very suitable to this group, confirming the well-marked seasonality of the climate, with frequent prolonged droughts, as interpreted in previous publications.
authors: Departamento de Biologia, Universidade Estadual do Maranhão, Cidade Universitária Paulo VI, CEP: 65055-970 São Luís, MA, Brazil.; Email: elianepsousa@yahoo.com.br.
authors: Eliane Pinheiro
authors: EP
authors: De Sousa
authors: Departamento de Química e Biologia, Universidade Federal do Maranhão, Campus do Bacanga, CEP: 65.085-580, São Luís, Maranhão, Brazil.; Email: manuel.alfredo@ufma.br.
authors: Manuel Alfredo
authors: MA
authors: Medeiros
authors: USP/ IGC/ GSA, Rua do Lago / 562, Cidade Universitária, Butantã, CEP: 05.508-080, São Paulo, Brasil.; Email: caetoledo@hotmail.com.
authors: Carlos Eduardo Vieira
authors: CE
authors: Toledo
authors: UNESP/ IGCE/ DGA/ NEPV, Av. 24 A, 1515, Campus Rio Claro, Bairro Bela Vista, CP 178, CEP: 13.506-900, Rio Claro, São Paulo, Brazil.; Email: rbertini@rs.unesp.br.
authors: Reinaldo J
authors: RJ
authors: Bertini
authors: Centro de Pesquisa de História Natural e Arqueologia do Maranhão, Rua do Giz, 59, Centro, CEP:65010-680, São Luís, Maranhão, Brazil.; Email: agostinhap@yahoo.com.br.
authors: Agostinha Araújo
authors: AA
authors: Pereira
authors: Universidade Federal do Rio de Janeiro, Departamento de Geologia, CCMN/IGEO, RJ 21.949-900, Cidade Universitária-Ilha do Fundão, Rio de Janeiro, Brazil.; Email: rlindoso@ufrj.br.
authors: Rafael Matos
authors: RM
authors: Lindoso
mesh_terms: D063147:Animal Distribution; D000818:Animals; D001938:Brazil; D005399:Fishes / Q000033:anatomy & histology / Q000145:classification*; D005580:Fossils / Q000033:anatomy & histology; D009929:Organ Size; D014070:Tooth / Q000033:anatomy & histology