An integrative taxonomic approach reveals<i>Octopus insularis</i>as the dominant species in the Veracruz Reef System (southwestern Gulf of Mexico)

González-Gómez, Roberto; Barriga-Sosa, Irene de los A.; Pliego-Cárdenas, Ricardo; Jiménez-Badillo, Lourdes; Markaida, Unai; Meiners-Mandujano, César; Morillo-Velarde, Piedad S.

doi:10.7717/peerj.6015

Cited by 29 publications

(23 citation statements)

References 52 publications

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“…We analysed genome-wide RAD loci to investigate the phylogenetic and specieslevel relationships within the highest value fisheries target species of octopus in the world. Our study provides evidence for the existence of three cryptic species within the 37 , which also appears to be true for O. insularis from the Caribbean and eastern North Brazil 38,39 . Both of the above examples suggest these taxa can maintain gene-flow despite connectivity requiring trans-tropical dispersal.…”

Section: Discussionsupporting

confidence: 72%

Genome-wide sequencing uncovers cryptic diversity and mito-nuclear discordance in theOctopus vulgarisspecies complex

Amor

Doyle

Norman

et al. 2019

Preprint

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Many marine species once considered to be cosmopolitan are now recognised as cryptic species complexes. Mitochondrial markers are ubiquitously used to address phylogeographic questions, and have been used to identify some cryptic species complexes; however, their efficacy in inference of evolutionary processes in the nuclear genome has not been thoroughly investigated. We used double digest restriction siteassociated DNA sequencing (ddRADseq) markers to quantify species boundaries in the widely distributed and high value common octopus, Octopus vulgaris, comparing genome-wide phylogenetic signal to that obtained from mitochondrial markers.Phylogenetic analyses, genome-wide concordance and species tree estimation based on 604 genome-wide ddRADseq loci revealed six species within the O. vulgaris group.Divergence time estimates suggested modern-day species evolved over the last 2.5 ma, during a period of global cooling. Importantly, our study identified significant phylogenetic discordance between mitochondrial and nuclear markers; genome-wide nuclear loci supported O. vulgaris sensu stricto and Type III (South Africa) as distinct species, which mtDNA failed to recognise. Our finding of conflicting phylogenetic signal between mitochondrial and nuclear markers has broad implications for many taxa.Improved phylogenetic resolution of O. vulgaris has significant implications for appropriate management of the group and will allow greater accuracy in global fisheries catch statistics.

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Section: Discussionsupporting

confidence: 72%

Genome-wide sequencing uncovers cryptic diversity and mito-nuclear discordance in theOctopus vulgarisspecies complex

Amor

Doyle

Norman

et al. 2019

Preprint

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“…from Old Providence. An O. insularis sequence from (González-Gómez et al, 2018) was included in the analysis, but during trimming it was erased due to its low coverage in the alignment. Therefore, together with the lack of rhodopsin sequences for Caribbean O. vulgaris, the mitochondrial results regarding O. tayrona could not be confirmed with the nuclear marker.…”

Section: Discussionmentioning

confidence: 99%

First molecular approach to the octopus fauna from the southern Caribbean

Ritschard

Guerrero-Kommritz²,

Sánchez

2019

PeerJ

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The octopus fauna from the southern Caribbean is an understudied field. However, recent taxonomic work in the Colombian Caribbean has led to the discovery of several new species in the family Octopodidae. To provide molecular evidence for recent descriptions in the area (i.e., Octopus taganga, O. tayrona and Macrotritopus beatrixi) and contribute to the systematics of the family, we reconstructed the first molecular phylogenies of the family including Colombian Caribbean octopus species. Using cytochrome c oxidase subunit I and rhodopsin sequences from specimens collected in three sites (Santa Marta, Old Providence and San Andrés Islands) we inferred maximum-likelihood trees and delimited species with PTP. Our mitochondrial analysis supported the monophyly of species found in the area (i.e., O. taganga, O. hummelincki and O. briareus). The genetic distinction of the species O. tayrona and O. insularis was not resolved, as these were found in one clade together with Caribbean O. vulgaris and O. aff. tayrona species (O. spB) and delimited as a single species. Additionally, our results suggest a distant relationship of the Type I O. vulgaris group (Caribbean region) from the other forms of the species complex (Old World and Brazil). Lastly, the third newly described species M. beatrixi emerged as an independent lineage and was delimited as a single species. However, its relationship to other species of its genus remains unknown due to the lack of sequences in databases. Altogether, our molecular approach to the octopus fauna from the southern Caribbean adds on information to the relationship of Octopodidae species world-wide by providing sequences from recently described species from an understudied region. Further studies employing higher taxon sampling and more molecular information are needed to fill taxonomic gaps in the area and account for single-locus resolution on the systematics of this group.

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“…It is also worth noting that some nominal species listed in the database are known to comprise species complexes. In contrast to the Octopus vulgaris complex (a focus of much recent research, e.g., Leite et al, 2008;Amor et al, 2014Amor et al, , 2015Amor et al, , 2017Gleadall, 2016;González-Gómez et al, 2018), the complexes of Sepia pharaonis (Anderson et al, 2011), Sepioteuthis lessoniana (Cheng et al, 2014) and Lolliguncula brevis (Sales et al, 2014) are not welldefined in geographical terms and therefore are listed as single species. Therefore, the species richness patterns presented here are conservative estimates.…”

Section: Databasementioning

confidence: 99%