Mitocondrial COI and 16S rDNA sequences support morphological identification and biogeography of deep-sea red crabs of the genus Chaceon (Crustacea, Decapoda, Geryonidae) in the Eastern Central and South Atlantic Ocean

The geographical spreading of new fishing activities and the increasingly deeper locations of these activities have shown the worldwide distribution of gerionid crabs and new descriptions of Chaceon taxa. However, incomplete penetrance, variable expressivity, and phenotypic overlap make the morphome...

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Bibliographic Details
Published in:PLOS ONE
Main Authors: Hernández M, Martín, María Virginia, Herrador-Gómez, Pedro M., Jiménez, Sebastián, Hernández-González, Carlos Luis, Barreiro-Jueguen, Santiago, Sarralde-Vizuete, Roberto, Van Zyl, Barend Johannes, Gamatham, Johny Charles, Almeida T, López-Abellán, Luis José
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
Pesquerías
Centro Oceanográfico de Canarias
fish
biogeography
deep water
identification
research
South Atlantic Ocean
Online Access:http://hdl.handle.net/10508/12480
http://hdl.handle.net/10261/324611
https://doi.org/10.1371/journal.pone.0211717
Description
Summary:The geographical spreading of new fishing activities and the increasingly deeper locations of these activities have shown the worldwide distribution of gerionid crabs and new descriptions of Chaceon taxa. However, incomplete penetrance, variable expressivity, and phenotypic overlap make the morphometric identification of these species difficult. In this study, partial sequences of the cytochrome c oxidase subunit 1 (COI) and 16S mitochondrial ribosomal RNA (16S rRNA) genes have been analyzed in Chaceon species from the Eastern Central and South Atlantic and compared with sequences of species from Western Atlantic. Our results corroborate the proposed morphological species and highlight the significant separation of the Eastern Atlantic species and those from Atlantic coasts of South America for both markers (97% Bayesian posterior probability, BPP / 83% Bootstrap replicates, BT). Interestingly, Chaceon sanctaehelenae shows a closer relationship with the species of the American coast than with those from the Eastern Atlantic. On the other hand, while COI marker clearly separates Chaceon atopus and Chaceon erytheiae species (99 BPP / 91% BT), these species share haplotypes for the 16S rRNA marker, pointing to a recent speciation process. Moreover, a close relationship was observed between Chaceon maritae and Chaceon affinis (94% BPP / 77% BT). The topologies of the trees obtained indicate that the ancestor of this genus was closer related to those species from South America than to those from the Eastern Atlantic. SI

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