Brittle stars from the Saint Peter and Saint Paul Archipelago: morphological and molecular data

Barboza, Carlos Alberto de Moura; Mattos, Gustavo; Paiva, Paulo Cesar

doi:10.1017/s1755267214001511

Cited by 6 publications

(7 citation statements)

References 24 publications

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“…Brittle stars (Ophiuroidea) encompass a large number of cryptic species (e.g. Barboza et al, 2015;Baric and Sturmbauer, 1999;Boissin et al, 2017Boissin et al, , 2008Heimeier et al, 2010;Hoareau et al, 2013;Hunter and Halanych, 2008;Muths et al, 2009Muths et al, , 2006Naughton et al, 2014;Pérez-Portela et al, 2013;Sponer and Roy, 2002;Stöhr and Muths, 2010;Taboada and Pérez-Portela, 2016). The Ophioderma longicauda (Bruzelius, 1805) species complex encompasses six mitochondrial lineages and at least two sympatric biological species with contrasting reproductive strategies, namely the broadcast spawners C3 and the internal brooders C5, differing in reproductive timing, morphology, ecology and genetics (Boissin et al, 2011;Stöhr et al, 2009;Weber et al, 2015Weber et al, , 2014Weber et al, , 2013).…”

Section: Introductionmentioning

confidence: 99%

Species delimitation in the presence of strong incomplete lineage sorting and hybridization: Lessons from Ophioderma (Ophiuroidea: Echinodermata)

Weber

Stöhr

Chenuil

2019

Molecular Phylogenetics and Evolution

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Accurate species delimitation is essential to properly assess biodiversity, but also for management and conservation purposes. Yet, it is not always trivial to accurately define species boundaries in closely related species due to incomplete lineage sorting. Additional difficulties may be caused by hybridization, now evidenced as a frequent phenomenon. The brittle star cryptic species complex Ophioderma longicauda encompasses six mitochondrial lineages, including broadcast spawners and internal brooders, yet the actual species boundaries are unknown. Here, we combined three methods to delimit species in the Ophioderma longicauda complex and to infer its divergence history: (i) unsupervised species discovery based on multilocus genotypes; (ii) divergence time estimation using the multi-species coalescent; (iii) divergence scenario testing (including gene flow) using Approximate Bayesian Computation (ABC) methods. 30 sequence markers (transcriptome-based, mitochondrial or non-coding) for 89 O. longicauda and outgroup individuals were used. First, multivariate analyses revealed six genetic clusters, which globally corresponded to the mitochondrial lineages, yet with many exceptions, suggesting ancient hybridization events and challenging traditional mitochondrial barcoding approaches. Second, multi-species coalescent-based analyses confirmed the occurrence of six species and provided divergence time estimates, but the sole use of this method failed to accurately delimit species, highlighting the power of multilocus genotype clustering to delimit recently diverged species. Finally, Approximate Bayesian Computation showed that the most likely scenario involves hybridization between brooders and broadcasters. Our study shows that despite strong incomplete lineage sorting and past hybridization, accurate species delimitation in Ophioderma was possible using a combination of complementary methods. We propose that these methods, especially multilocus genotype clustering, may be useful to resolve other complex speciation histories.

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Section: Introductionmentioning

confidence: 99%

Species delimitation in the presence of strong incomplete lineage sorting and hybridization: Lessons from Ophioderma (Ophiuroidea: Echinodermata)

Weber

Stöhr

Chenuil

2019

Molecular Phylogenetics and Evolution

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“…angulata is frequently characterized by at most seven arm spines. Barboza et al [21] described the dorsal arm plates of the Ophiothrix angulata from SPSPA with the distal edge slightly lobed, which we assume to be the carena found on O . trindadensis .…”

Section: Resultsmentioning

confidence: 91%

“…Distribution . Tropical Atlantic (realm), Tropical Southwestern Atlantic (province): São Pedro and São Paulo Islands [21], Northeastern Brazil [63], Eastern Brazil [64], Trindade and Martin Vaz Islands [10].…”

Section: Resultsmentioning

confidence: 99%

“…Two brittle stars identified as Ophiothrix angulata by Barboza et al [21] were sampled by scuba diving in 2013. Logistics were supported by the PROARQUIPÉLAGO Program.…”

Section: Methodsmentioning

confidence: 99%

“…Logistics were supported by the PROARQUIPÉLAGO Program. The specimens were found associated with Chaetopterus polychaete tubes [21].…”

Section: Methodsmentioning

confidence: 99%

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Atlantic West Ophiothrix spp. in the scope of integrative taxonomy: Confirming the existence of Ophiothrix trindadensis Tommasi, 1970

et al. 2019

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We re-describe and confirm the validity of Ophiothrix trindadensis Tommasi, 1970 (Echinodermata: Ophiuroidea). This is a native species from Brazil, however it lacked a type series deposited in scientific collections. The recognition of O. trindadensis was made possible using integrative taxonomy applied to many specimens from the type locality (Trindade Island) as well as from different locations along the Brazilian coast (Araçá Bay and Estuarine Complex of Paranaguá). Initially, 835 specimens were studied and divided into four candidate species (CS) inferred from external morphological characters. Afterwards, the CSs were compared using integrative taxonomy based on external morphology, arm microstructures morphology (arm ossicle), morphometry, and molecular studies (fragments of the mitochondrial genes 16S and COI). Analyses indicated CS1 and CS2 as O. trindadensis, and CS3 as O. angulata, both valid species. CS4 remains O. cf. angulata as more data, including their ecology and physiology, are needed to be definitively clarified. Our integrative investigation using specimens from the type locality overcame the lack of type specimens and increased the reliable identification of O. trindadensis and O. angulata.

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Genetic diversity of polychaete annelids from the Saint Peter and Saint Paul Archipelago, Equatorial Atlantic, with description of a new species

Ribeiro,

Freitas,

Zanol

et al. 2023

Regional Studies in Marine Science

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Brittle stars from the Saint Peter and Saint Paul Archipelago: morphological and molecular data

Cited by 6 publications

References 24 publications

Species delimitation in the presence of strong incomplete lineage sorting and hybridization: Lessons from Ophioderma (Ophiuroidea: Echinodermata)

Species delimitation in the presence of strong incomplete lineage sorting and hybridization: Lessons from Ophioderma (Ophiuroidea: Echinodermata)

Atlantic West Ophiothrix spp. in the scope of integrative taxonomy: Confirming the existence of Ophiothrix trindadensis Tommasi, 1970

Genetic diversity of polychaete annelids from the Saint Peter and Saint Paul Archipelago, Equatorial Atlantic, with description of a new species

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