Systematic and palaeoecological significance of the first record of Pygocephalomorpha females bearing oöstegites (Malacostraca, Peracarida) from the lower Permian of southern Brazil

dc.contributor.authorPazinato, Paula Giovana [UNESP]
dc.contributor.authorSoares, Marina Bento
dc.contributor.authorAdami-Rodrigues, Karen
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal do Rio Grande do Sul
dc.contributor.institutionUniversidade Federal de Pelotas
dc.date.accessioned2018-12-11T16:43:45Z
dc.date.available2018-12-11T16:43:45Z
dc.date.issued2016-11-01
dc.description.abstractMalacostracan crustaceans of the fossil order Pygocephalomorpha are conspicuous elements in brackish to freshwater faunas in the upper Carboniferous of Laurentia and lower Permian of Gondwana. A pronounced sexual dimorphism is recognizable within its members, with Pygocephalomorpha females bearing oöstegites: modified epipodites that hold a brood pouch where the eggs develop until juvenile stage, with no planktonic dispersal of larvae. The preservation of oöstegites is quite rare and is described here for the first time from the American continents. The specimens, ventrally preserved Liocaris huenei females bearing oöstegites, come from the Irati Formation, a lower Permian sequence of the Paraná Basin, from an outcrop in southern Brazil. The oöstegites are similar to those previously described for Pygocephalomorpha, displaying seven pairs of overlapping epipodites that cover the whole cephalothorax. The scarcity of these structures in the fossil record may be explained by taphonomic bias (it requires ventrally preserved crustaceans) but more likely by palaeobiological aspects, such as preservation of an ovigerous moult. The record from the Irati Formation suggests that pygocephalomorphs had seasonal reproduction, with females maturing at the same time and acquiring oöstegites that would be lost after the release of juveniles. This record confirms the relationship of the Brazilian Liocaris Beurlen to the English Pygocephalus Huxley and South African Notocaris Broom pygocephalomorphs and provides an insight into its palaeoecological significance.en
dc.description.affiliationInstituto de Geociências UNESP – Univ Estadual Paulista, Avenida 24 A, 1515
dc.description.affiliationDepartamento de Paleontologia e Estratigrafia Universidade Federal do Rio Grande do Sul, Campus do Vale, Avenida Bento Gonçalves 9500
dc.description.affiliationNúcleo de Estudos em Paleontologia e Estratigrafia Universidade Federal de Pelotas, Praça Domingos Rodrigues 02
dc.description.affiliationUnespInstituto de Geociências UNESP – Univ Estadual Paulista, Avenida 24 A, 1515
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado do Rio Grande do Sul
dc.description.sponsorshipIdFundação de Amparo à Pesquisa do Estado do Rio Grande do Sul: PqG11/1535-7
dc.format.extent817-826
dc.identifierhttp://dx.doi.org/10.1111/pala.12260
dc.identifier.citationPalaeontology, v. 59, n. 6, p. 817-826, 2016.
dc.identifier.doi10.1111/pala.12260
dc.identifier.issn1475-4983
dc.identifier.issn0031-0239
dc.identifier.scopus2-s2.0-84987904698
dc.identifier.urihttp://hdl.handle.net/11449/168953
dc.language.isoeng
dc.relation.ispartofPalaeontology
dc.relation.ispartofsjr1,840
dc.relation.ispartofsjr1,840
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectfemales bearing oöstegites
dc.subjectGondwana
dc.subjectLower Permian
dc.subjectMalacostraca
dc.subjectPeracarida
dc.subjectPygocephalomorpha females
dc.subjectSouthern Brazil
dc.titleSystematic and palaeoecological significance of the first record of Pygocephalomorpha females bearing oöstegites (Malacostraca, Peracarida) from the lower Permian of southern Brazilen
dc.typeArtigo

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