Planohybodus marki sp. nov., a new fresh-water hybodontid shark from the Early Cretaceous of northeastern Brazil |
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| Institution: | 1. Departamento de Paleontologia e Estratigrafia, IGeo, UFRGS, Cx.P. 15001, 91501-970 Porto Alegre, RS, Brazil;2. Universidade Federal do Rio Grande – FURG, Instituto de Oceanografia – IO, Laboratório Oceanografia Geológica – LOG, Av. Itália Km 8, Rio Grande, CEP: 96201-900, RS, Brazil;3. Curso de Biologia, Universidade Estadual Vale do Acaraú, Sobral, CE, Brazil;1. Palaeontological Institute and Museum, University of Zurich, Karl Schmid-Strasse 4, 8006 Zurich, Switzerland;2. Idaho Museum of Natural History, Idaho State University, 698 E. Dillon St., 83201 Pocatello, ID USA;1. Laboratório de Sistemática e Tafonomia de Vertebrados Fósseis, Departamento de Geologia e Paleontologia, Museu Nacional/Universidade Federal do Rio de Janeiro (UFRJ), Quinta da Boa Vista, s/n, São Cristóvão, 20940-040 Rio de Janeiro, RJ, Brazil;2. Universidade Estácio de Sá, Rua André Rocha, 838, Taquara, 22710-560 Rio de Janeiro, RJ, Brazil;3. Museu de Ciências da Terra, Serviço Geológico do Brasil – CPRM, Av. Pasteur 404, Urca, 22290-255 Rio de Janeiro, RJ, Brazil;1. Centro de Apoio à Pesquisa Paleontológica da Quarta Colônia, Universidade Federal de Santa Maria, São João do Polêsine, Brazil;2. Programa de Pós-Graduação Em Biodiversidade Animal, Universidade Federal de Santa Maria, Santa Maria, Brazil;3. Laboratório de Paleobiologia, Universidade Federal do Pampa, São Gabriel, Brazil;4. Laboratório de Estratigrafia e Paleobiologia, Universidade Federal de Santa Maria, Santa Maria, Brazil;1. School of the Environment, Geography and Geological Sciences, University of Portsmouth, Burnaby Road, PO1 3QL, UK;2. Department of Biology and Biochemistry, Claverton Down, University of Bath, Bath, BA2 7AY UK |
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| Abstract: | A new species of hybodontid shark is described for the Lower Cretaceous of Brazil. The type specimen is derived from pre-Aptian strata of Malhada Vermelha Formation, Lima Campos Basin (Ceará State, northeastern Brazil), with referred material from the Missão Velha Formation of Araripe Basin, northeastern Brazil. The new taxon differs from other Planohybodus species by the presence of a stronger tooth ornamentation characterized by simple, usually non-branching cristae that nearly reach the apex of the main cusp as well as distinctly divergent lateral cusplets. In addition, certain North-American specimens formerly attributed to Hybodus are identified as Planohybodus. The new species presented herein, in addition to the North-American remains, represents an important contribution to the knowledge of the distribution of Planohybodus, expanding the geographic range of the genus to South and North America in the Late Jurassic and Early Cretaceous. |
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