Extension range of four species of freshwater crabs (Decapoda: Trichodactylidae) in the state of Maranhão, Northeastern Brazil

Andrade, Kele Sousa Pires; Araújo, Marina de Sá Leitão Câmara de; Nunes, Jorge Luiz Silva

doi:10.1590/2358-2936e2018034

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2024

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“…Os resultados obtidos por ambas as análises revelaram a existência de duas linhagens com forte Dilocarcinus septemdentatus sensu habita rios e lagoas do Suriname, Guiana Francesa, Brasil (Acre, Amapá, Amazonas, Pará, Maranhão e Goiás) e Peru Santos & Vieira 2017;Andrade et al 2018), além de também ter sido reportado na Argentina . O mapa abaixo (Figura 7a) ilustra os pontos de ocorrência registrados até então na literatura e os pontos amostrados no presente estudo.…”

Section: Conclusãounclassified

Variabilidade morfológica e genética dos caranguejos neotropicais >i<Dilocarcinus pagei>/i< Stimpson, 1861 e >i<D. septemdentatus>/i< (Herbst, 1783) (Decapoda, Trichodactylidae)

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Section: Conclusãounclassified

Variabilidade morfológica e genética dos caranguejos neotropicais >i<Dilocarcinus pagei>/i< Stimpson, 1861 e >i<D. septemdentatus>/i< (Herbst, 1783) (Decapoda, Trichodactylidae)

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Integrative approach revealing a species complex in the Neotropical freshwater crab Dilocarcinus septemdentatus (Herbst, 1783) (Decapoda: Trichodactylidae) with a description of a new species

Felix Caetano França,

Magalhães,

Mantelatto

2024

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The taxonomic status of the freshwater crab Dilocarcinus septemdentatus (Herbst, 1783) is still not well established. Currently, the main issue involves synonymization with D. spinifer H. Milne Edwards, 1853, based on a variation of the angulation of the gonopod apex. These species are distributed along rivers and lakes in northern South America, with disjunct occurrences in central-west Brazil and Argentina. Due to these inconsistencies, an integrative approach was performed to elucidate these questions, with morphological (including NanoCT-Scan) and molecular analysis (Maximum Likelihood Trees, Bayesian Inference, Genetics Distance Matrix, and Haplotype Network), based on mitochondrial markers COI and 16S rRNA. Both analysis revealed and supported the existence of a species complex under the name of D. septemdentatus. Based on the results obtained, we propose the revalidation of D. spinifer, the description of a new species, and the redescription of D. septemdentatus s. str., with a neotype designation for this species. The hypothesis that this species complex originated in the Pebas System, an extensive mega wetland system that existed along the lowlands of Western Amazonia from late Oligocene to late Miocene (c. 23–11 mya) is discussed.

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Extension range of four species of freshwater crabs (Decapoda: Trichodactylidae) in the state of Maranhão, Northeastern Brazil

Cited by 2 publications

References 9 publications

Variabilidade morfológica e genética dos caranguejos neotropicais >i<Dilocarcinus pagei>/i< Stimpson, 1861 e >i<D. septemdentatus>/i< (Herbst, 1783) (Decapoda, Trichodactylidae)

Variabilidade morfológica e genética dos caranguejos neotropicais >i<Dilocarcinus pagei>/i< Stimpson, 1861 e >i<D. septemdentatus>/i< (Herbst, 1783) (Decapoda, Trichodactylidae)

Integrative approach revealing a species complex in the Neotropical freshwater crab Dilocarcinus septemdentatus (Herbst, 1783) (Decapoda: Trichodactylidae) with a description of a new species

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