Global biodiversity of the genus Ommastrephes (Ommastrephidae: Cephalopoda): an allopatric cryptic species complex

Fernandez Alvarez, Fernando A and Braid, Heather E and Nigmatullin, Chingis M and Bolstad, Kathrin S R and Haimovici, Manuel and Sánchez, Pilar and Saji Kumar, K K and Ragesh, N and Villanueva, Roger (2020) Global biodiversity of the genus Ommastrephes (Ommastrephidae: Cephalopoda): an allopatric cryptic species complex. Zoological Journal of the Linnean Society. pp. 1-23.

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    Abstract

    Cryptic speciation among morphologically homogeneous species is a phenomenon increasingly reported in cosmopolitan marine invertebrates. This situation usually leads to the discovery of new species, each of which occupies a smaller fraction of the original distributional range. The resolution of the taxonomic status of species complexes is essential because species are used as the unit of action for conservation and natural resource management politics. Before the present study, Ommastrephes bartramii was considered a monotypic cosmopolitan species with a discontinuous distribution. Here, individuals from nearly its entire distributional range were evaluated with mitochondrial DNA (cytochrome c oxidase subunit I and 16S rRNA). Four distinct species were consistently identified using four molecular species delimitation methods. These results, in combination with morphological and metabolic information from the literature, were used to resurrect three formerly synonymized names (Ommastrephes brevimanus, Ommastrephes caroli and Ommastrephes cylindraceus) and to propose revised distributional ranges for each species. In addition, diagnostic characters from the molecular sequences were incorporated in the species description. At present, only one of the four newly recognized species (Ommastrephes bartramii) is commercially exploited by fisheries in the North Pacific, but it now appears that the distributional range of this species is far smaller than previously believed, which is an essential consideration for effective fisheries management.

    Item Type: Article
    Uncontrolled Keywords: Cephalopoda; Ommastrephes brevimanus; Ommastrephes caroli; Ommastrephes cylindraceus; phylogeny; systematics; taxonomy
    Subjects: Molluscan Fisheries > Cephalopods
    Molluscan Fisheries
    Divisions: CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    Subject Area > CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    Depositing User: Arun Surendran
    Date Deposited: 23 Mar 2020 05:02
    Last Modified: 23 Mar 2020 05:02
    URI: http://eprints.cmfri.org.in/id/eprint/14163

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