Seixas, Victor Corrêa; Steiner, Tatiana Menchini; Solé-Cava, Antônio Mateo; Amaral,Antonia Cecília Zacagnini; Paiva, Paulo Cesar. (2020). Hidden diversity within the Diopatra cuprea complex (Annelida: Onuphidae): morphological and genetics analyses reveal four new species in the south-west Atlantic. Zoological Journal of the Linnean Society. 191(3): 637-671: zlaa032.

380590

10.1093/zoolinnean/zlaa032 [view]

urn:lsid:zoobank.org:pub:33E2BB7F-D8F8-4796-9580-05DE8E839ACC [view]

Seixas, Victor Corrêa; Steiner, Tatiana Menchini; Solé-Cava, Antônio Mateo; Amaral,Antonia Cecília Zacagnini; Paiva, Paulo Cesar

2020

191(3): 637-671: zlaa032

Publication

https://academic.oup.com/zoolinnean/article-abstract/191/3/637/5836741

World Polychaeta Database (WPolyDb). Closed access. Version of record online 13 May 2020 with ZooBank registration, in print March 2021

Available for editors  

Diopatra is the most species-rich genus of Onuphidae with about 60 species. Although 14 species have been reported for Brazil, the cosmopolitan D. cuprea is the most commonly reported from the area, including populations with a large morphological diversity. To better elucidate this species complex, we use morphological and molecular data, and reveal a hidden diversity. Thus, we describe four new species (D. hannelorae sp. nov., D. marinae sp. nov., D. pectiniconicum sp. nov. and D. victoriae sp. nov.) and discuss their geographical and bathymetrical distributions. None of the analysed specimens could be identified as D. cuprea based on available sequences. New taxonomic characters were highlighted, including jaw morphology, which was the determinant factor to differentiate D. marinae from D. victoriae. Phylogenetic analysis indicates three (COI and ND4) or four (concatenated) lineages, because D. marinae was not always reciprocally monophyletic. Sequence-based species delimitation also indicates three to five species, depending on the method used. Inter- and intragroup genetic divergence and haplotype network analysis supported four species. The divergence time among species indicates that Pleistocene sea-level fluctuations and the Vitória–Trindade chain limited the gene flow between northern and southern populations and contributed to the emergence of species, mainly in the case of D. marinae and D. victoriae.

Brazil

Systematics, Taxonomy

Annelida
Polychaeta

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