5 research outputs found

    Validation of Chronocancer camilosantanai† Santana, Tavares, Martins, Melo & Pinheiro (Crustacea, Decapoda, Brachyura) from the Romualdo Formation, Araripe Sedimentary Basin, Brazil

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    Santana et al. (2022) described a new genus and species of fossil crab, Chronocancer camilosantanai, from carbonate concretions of the Romualdo Formation of the Araripe Sedimentary Basin. The journal in which the description appeared was published online only and the new name did not include a ZooBank registration number (LSID), as required for validation of new names in electronic-only publications. The present note serves to validate the name Chronocancer camilosantanai by fulfilling the ICZN conditions for nomenclatural availability. The date and authorship of the specific name, accordingly, are those of this note, not Santana et al. (2022)

    Taxonomic revision and phylogenetic relationships in Inchoididae Dana, 1851 (Crustacea, Brachyura, Majoidea)

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    Este trabalho está organizado em duas partes principais: uma revisão taxonômica dos gêneros e espécies de Inachoididae Dana, 1851, e uma análise filogenética com o objetivo precípuo de testar o monofiletismo da família e propor uma hipótese filogenética a partir de dados morfológicos. A presente revisão taxonômica se baseou no estudo de extensas coleções contendo centenas de exemplares pertencentes a 35 espécies distribuídas em 11 gêneros de Inachoididae. Todos os gêneros atribuídos à Inachoididae foram examinados. De todas as espécies que compõe a família, apenas Collodes nudus Stimpson, 1871 e C. robsonae Garth, 1958 não foram obtidos para exame. O material examinado inclui os tipos de 26 espécies nominais. Antes de iniciarmos o nosso trabalho a família Inachoididae compreendia 34 espécies e 10 gêneros. O gênero monotípico Erileptus Rathbun, 1893, tradicionalmente atribuído à Inachidae, é aqui transferido à Inachoididae;Pyromaia vogelsangi Türkay, 1968 sinonimizada à Anasimus latus Rathbun, 1894; e Euprognatha sp. nov. descrita a partir de material proveniente da costa nordeste brasileira. Lectótipos foram designados para as seguintes espécies: Anasimus fugax A. MilneEdwards, 1880; Collodes robustus Smith, 1883; Collodes depressus A. MilneEdwards, 1878; Erileptus spinosus Rathbun, 1893; Anasimus rostratus Rathbun, 1893; Euprognatha acuta A. Milne Edwards, 1880; Batrachonotus nicholsi Rathbun, 1894; Euprognatha granulata Faxon, 1893; Leurocyclus gracilipes (A. MilneEdwards in A. MilneEdwards & Bouvier, 1923). Para a análise filogenética foram obtidos 57 caracteres da morfologia externa. O grupo externo foi composto por representantes de três famílias de Majoidea Samouelle, 1819 (Inachidae MacLeay, 1838; Oregoniidae Garth, 1958; Pisidae Dana, 1851). Foram obtidas 24 árvores igualmente parcimoniosas (191 passos; índice de consistência 0,36; índice de retenção 0,71). O monofiletismo de Inachoididae foi demonstrado inequivocamente. Os gêneros Euprognatha Stimpson, 1871, Inachoides H. Milne Edwards & Lucas, 1842 e Paradasygyius Garth, 1958 são monofiléticos. Os gêneros monotípicos Aepinus Rathbun , 1897, Arachnopsis Stimpson , 1871, Batrachonotus Stimpson, 1871, Erileptus e Leurocyclus Rathbun, 1897 são parafiléticos por definição. Anasimus A. MilneEdwards, 1880, Collodes Stimpson, 1860 e Pyromaia Stimpson, 1871 são parafiléticos. As conseqüências da análise filogenética para a classificação dos Inachoididae são discutidas em detalhe.This work is organized in two main parts: a taxonomic revision of the genera and species of Inachoididae, and a phylogenetic analysis to test the monophyly of the family and to propose a phylogenetic hypothesis based on morphological data. The study of large collections containing hundreds of specimens pertaining to 35 species distributed in 11 genera of Inachoididae supported the taxonomic revision. All genera attributed to Inachoididae were examined. From the whole family, only Collodes nudus Stimpson, 1871 e C. robsonae Garth, 1958 could not be examined. The studied material included types of 26 nominal species. Prior to the beginning of our work, the family Inachoididae was composed by 34 species in 10 genera. The monotypic genus Erileptus Rathbun, 1893, traditionally attributed to Inachidae, was transferred to Inachoididae; Pyromaia vogelsangi Türkay, 1968 synonymized to Anasimus latus Rathbun, 1894; and Euprognatha n. sp. described with material from the northeast coast of Brazil. Lectotypes were designated for the following species: Anasimus fugax A. MilneEdwards, 1880; Collodes robustus Smith, 1883; Collodes depressus A. MilneEdwards, 1878; Erileptus spinosus Rathbun, 1893; Anasimus rostratus Rathbun, 1893; Euprognatha acuta A. MilneEdwards, 1880; Batrachonotus nicholsi Rathbun, 1894; Euprognatha granulata Faxon, 1893; Leurocyclus gracilipes (A. Milne Edwards in A. MilneEdwards & Bouvier, 1923). For the phylogenetic analysis, 57 morphological characters were obtained. The outgroup was composed by representatives from three families of Majoidea Samouelle, 1819 (Inachidae MacLeay, 1838; Oregoniidae Garth, 1958; Pisidae Dana, 1851). We obtained 24 equally most parsimonious trees (191 steps; Consistency Index 0.26; Retention Index 0.71). The monophyly of Inachoididae was recovered unequivocally. The genera Euprognatha Stimpson, 1871, Inachoides H. Milne Edwards & Lucas, 1842 and Paradasygyius Garth, 1958 are monophyletic. The monotypic genera Aepinus Rathbun , 1897, Arachnopsis Stimpson , 1871, Batrachonotus Stimpson, 1871, Erileptus and Leurocyclus Rathbun, 1897 are paraphyletic by definition. Anasimus A. Milne Edwards, 1880, Collodes Stimpson, 1860 and Pyromaia Stimpson, 1871 are paraphyletic. The consequences for the classification of Inachodidae are discussed in detail

    A new genus and two new species of hymenosomatid crabs (Crustacea:Brachyura: Hymenosomatidae) from the southwestern Atlantic and eastern Australia

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    A new genus, Teramnonotus n. gen., is erected for Elamena gordonae Monod, 1956. The new genus includes two new species, T. johnlucasi n. gen., n. sp. and T. monodi n. gen., n. sp., described herein from eastern Australia (Queensland) and the southwestern Atlantic (Brazil), respectively. Teramnonotus n. gen. superficially resembles Elamena H. Milne Edwards, 1837, and Trigonoplax H. Milne Edwards, 1853, of which it can be easily distinguished by a combination of characters: eyes and ocular peduncle, rostrum, carapace, thoracic sternite 8 and thoracic pleurite 8, and the inhalant water openings. The validity of the obscure species Elamena mexicana H. Milne Edwards, 1853, is not supported and it is synonymised with Halicarcinus planatus (Fabricius, 1775)

    Quantification of extinction risk for crustacean species: an overview of the National Red Listing process in Brazil

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    Crustacean species from Brazil were evaluated to define their conservation status under the Categories and Criteria of the IUCN Red List of Threatened Species at the regional level. This study represents an effort of the Chico Mendes Institute for Biodiversity Conservation (ICMBio), the Brazilian agency for conservation of biodiversity, and the Brazilian Crustacean Society (SBC) to systematically collate specific data for these species and to determine their risks of extinction. The IUCN Red List Categories and Criteria were applied to 130 candidate species, following IUCN Red List Guidelines. Assessments to determine the risk of extinction were conducted during a three-day workshop held in Brasília in September 2010, which brought together about 30 experts to share information about species and threats. A total of 14 species (11.6%), 12 of them endemic to Brazil, qualified for one of the three Red List categories of threat (CR, EN, or VU). Twenty-five species (20.8%) were listed as Data Deficient, and because of this lack of data the extinction risk for crustaceans may be under-estimated. IUCN Criterion B was most often used during the assessments (85%), and the main threats identified are associated with removal of riparian forest causing siltation, and discharge of domestic, urban, industrial, and agricultural effluents, degrading water quality, as well as uncontrolled fishery activities. The South Atlantic hydrological basin contains the largest number of threatened species, which indicates that increased attention from agencies, institutions, and researchers is needed to develop appropriate strategies and regulations to aid in their conservation.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq
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