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The Genera Haplocytheridea Stephenson, 1936 and Cytheridea Bosquet, 1852 (Subphylum Crustacea, Class Ostracoda) from the Early Miocene Pirabas Formation, Brazil |
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| Authors: | Anna Andressa Evangelista Nogueira Maria Inês Feijó Ramos |
| Institution: | a Universidade Federal do Pará, Instituto de Geociêcias, Programa de Pós-Graduação em Geologia e Geoquímica, Brazil b Museu Paraense Emílio Goeldi, Campus de Pesquisa, Coordenação de Ciências da Terra e Ecologia, Av. Perimetral, cx. postal 399, 1901, Belém, PA, Brazil c University of North Alabama, Department of Physics and Earth Science, P.O. Box 5130,1 Harrison Plaza, Florence, AL 35632-0001, USA |
| Abstract: | The genera Haplocytheridea and Cytheridea have Tethyan origins and a wide paleobiogeographic and stratigraphic distribution, ranging from the Cretaceous to Recent. Both of them have been recorded in northern South America, but only Cytheridea has been found in the northern Cretaceous basins of Brazil. The genus Haplocytheridea is recorded, for the first time, in the Early Miocene deposits of the Pirabas Formation of northern Brazil, from a 20 m-thick succession of carbonate and argillaceous rocks deposited in lagoonal and restricted platform environments. Among the ten Haplocytheridea species identified, four are new: H. variopunctata n. sp., H. sandbergi n. sp., H. pirabasensis n. sp. and H. sinuosa n. sp. In addition, three new species of Cytheridea are also described: C. coimbrai n. sp., C. pirabasensis n. sp. and C. purperae n. sp. The highest frequencies and abundances of both genera, in the studied section, are thought to be associated with nearshore to brackish water settings. |
| Keywords: | Ostracods Haplocytheridea Cytheridea Pirabas Formation Miocene Brazil |
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