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Mato Grosso do Sul has a significant area with Devonian outcrops containing fossils mainly of marine invertebrates, plants and, more rarely, fish fragments of the climax and impoverished Malvinoxhosan (= Malvinokaffric) fauna. Despite this, for a long time the state had a lack in studies related to the Devonian paleontology of the Paraná Basin, only gaining prominence from the 2010s onwards. Therefore, the objective of this work is to present a guide of the fossiliferous Devonian outcrops recognized so far in the state, which are located in the municipalities of Rio Negro, Rio Verde de Mato Grosso, Coxim and Pedro Gomes. The outcrops presented here represent a true geopaleontological heritage in situ. Divulge them is vital not only for their preservation, but also for the dissemination and appreciation of paleontological science among society in general.

Brachiopods of the superfamily Chonetoidea are abundantly found in Devonian rocks in the Paraná Basin (Brazil). Despite this, only two species were formally known: Pleurochonetes falklandicus and Australostrophia mesembria, while at least 34 other taxa are known in other locations also within the Malvinokaffric Realm. In this contribution we present nine new taxa of Chonetoidea from the Ponta Grossa (late Pragian–early Emsian) and São Domingos (late Emsian–Frasnian) formations in the Paraná Basin: Babinia parvula maxima ssp. nov., Kentronetes? iclaense, Kentronetes? ortegae?, Sanjuanetes? sp., Chonostrophia? aff. truyolsae, Chonetidae indet., Pleurochonetes? comstocki?, Notiochonetes skottsbergi and Pleurochonetes surucoi?. Additionally, we emended the diagnosis of Babinia parvula. This expands the known diversity of Devonian Chonetoidea of the Paraná Basin. We also discuss the likely living environment of the identified taxa, based on the outcrops from which they came. The identification of these taxa provide new paleobiogeographic and chronostratigraphic information, allowing interpretations about possible affinities and migration routes of these benthic organisms within the Malvinokaffric Realm regions. Keywords: chonetoideans, Malvinokaffric Realm, Lower–Middle Devonian, systematic, paleoenvironments, paleobiogeography.

Wyatt Earp, from Hero of the American Western to the Name of Devonian Formation in Antarctic Territory.In science, it is common to name new taxa, geographic points or stratigraphic units with the names of important researchers, pioneer explorers or simply people important to the author who is describing these novelties. This paper presents a curious case of an Antarctic Devonian formation whose name is a tribute to Wyatt Earp, an illustrious character from the American Western. The story began with the American explorer Lincoln Ellsworth, who was a fan of Wyatt Earp and named one of the boats used by him during his expedition to Antarctica after his hero. Later, the name of the boat served as an inspiration to baptize a mount in Antarctica and its name served as a reference to name the Devonian age formation that outcrops in the region of that mount. Wyatt Earp died about four years before Ellworth’s explorations to Antarctica began, and he certainly never imagined that he would become immortalized with the name of a geographic point and a stratigraphic unit as far away as the South Pole. The nomenclature of novelties in the natural sciences encompasses several possibilities and reasons. Keywords: Nomenclature, Mount Wyatt Earp Formation, West Antarctica.

Atualmente no Devoniano da Bacia do Parana apenas duas especies da superfamilia Chonetoidea sao reconhecidas formalmente: Australostrophia mesembria (Clarke, 1913) e Pleurochonetes falklandicus (Morris & Sharpe,1846). Contudo, em outras localidades abrangidas igualmente pela Provincia Malvinocafrica, a diversidade desta superfamilia e significativamente maior. No presente artigo fez-se um estado da arte do estudo de Chonetoidea na Bacia do Parana, com o intuito de compreender os motivos desta aparente baixa diversidade na referida bacia. Percebeu-se que embora ja faca mais de um seculo desde os primeiros relatos, poucos estudos formais, tratando do tema, foram publicados ate o presente momento. Este fato parece refletir na baixa diversidade registrada, tendo em vista que resultados obtidos em trabalhos nao considerados publicacoes formais, tais como dissertacoes e teses, sugerem uma maior variedade de taxons. Portanto, concluiu-se que mais estudos formais, abordando este tema, sao necessarios a fim de caracterizar a real diversidade de Chonetoidea na Bacia do Parana, contribuindo para um melhor entendimento da Provincia Malvinocafrica como um todo.

Made available in DSpace on 2022-05-01T03:42:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-08-01 Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The Malvinokaffric Realm is an endemic paleogeographic region that inhabited Gondwanan high latitude seas during Early-Middle Devonian times. The causes for the collapse of this fauna are still debated but seem to be related to a transgressive event during Middle Devonian in the Chaco and Paraná basins in Bolivia and Brazil, which probably generated warmer water currents into the seas bearing Malvinokaffric fauna. This study applies ichnology as a relative proxy to better understand the impact of the main paleobiological events in the collapse of the Malvinokaffric Realm. Eight Devonian ichnoguilds are recognized in this study (Asterosoma, Glossifungites, Macaronichnus, Phycosiphon, Planolites, Skolithos, Teichichnus, and Zoophycos), and their stratigraphic distribution was compared with macrofossil distribution in Paraná Basin. The Pragian to Middle Emsian strata represent the climax of the diversity of body and trace fossils, recording distinct invertebrate life habits; the Asterosoma and Skolithos ichnoguilds predominate in the southern and northwestern borders, respectively, the last representing proximal settings. The “first decline” in Malvinokaffric diversity is diagnosed during the Eifelian, after an extensive regressive event during the late Emsian characterized by the reduction in different life habits, mostly suspension- and detritus-feeding. Trace fossils represent the Planolites ichnoguild principally, and the Eifelian strata are virtually absent on the northwest edge close to the paleo-basin flanks. The Givetian interval is characterized by the most expressive flooding event (Káčak event) that connected several Gondwanic basins, allowing the presence of extra-Malvinokaffric taxa in the Paraná Basin. Trace fossils are represented chiefly by the Phycosiphon ichnoguild in the Eifelian–Givetian boundary in the southern edge, and Planolites, Asterosoma, and Skolithos ichnoguilds in the upper strata. Finally, the Frasnian strata were diagnosed only to the northwestern edge of the basin, presenting a very low macrofossil diversity (e.g., lingulids and Australocoelia), and a low-ichnodiversity progradational trend from Phycosiphon to Skolithos ichnoguild. The identified paleoenvironmental changes evidences that the Early Devonian shallow seas (Jaguariaíva Member) were impacted by a gradual increase in freshwater input towards the Middle Devonian. Universidade Federal de Uberlândia Instituto de Geografia Laboratório de Paleontologia Estratigráfica, Rua XV de Novembro, 501, Monte Carmelo Unisinos University Geology Graduate Program, Av. Unisinos, 950 Universidade Federal do Rio de Janeiro Museu Nacional Departamento de Geologia e Paleontologia Laboratório de Paleoinvertebrados (LAPIN) Universidade Estadual de Ponta Grossa, Av. Carlos Cavalcanti, 4748, Uvaranas Universidade Estadual Paulista Júlio de Mesquita Filho Faculdade de Ciências de Bauru, Av. Eng. Luiz Edmundo Carrijo Coube, 14-01, Vargem Limpa Laboratório de Geologia Sedimentar – LAGESED Universidade Federal do Rio de Janeiro Universidade Estadual de Goiás Campus Norte Unidade Universitária de Niquelândia Centro Habitacional Codemim-CHC, Rua 08, nº04 Serviço Geológico do Brasil Museu de Ciências da Terra, Av. Pasteur, 404, Urca Instituto Federal do Paraná Campus Jaguariaíva, Rod. PR 151 Km 23, Cianê Universidade Estadual Paulista Júlio de Mesquita Filho Faculdade de Ciências de Bauru, Av. Eng. Luiz Edmundo Carrijo Coube, 14-01, Vargem Limpa CNPq: 159548/2018-7 FAPERJ: 26/200.110/2019 CNPq: 310377/2019-6