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

AuthorsFernández-Álvarez, Fernando Ángel ; Braid, Heather E.; Nigmatullin, Ch. M.; Bolstad, Kat S.R.; Haimovici, Manuel; Sánchez, Pilar ; Sajikumar, Kurichithara K.; Ragesh, Nadakkal; Villanueva, Roger
Ommastrephes brevimanus
Ommastrephes caroli
Ommastrephes cylindraceus
Issue DateOct-2020
PublisherLinnean Society of London
CitationZoological Journal of the Linnean Society 190(2): 460-482 (2020)
AbstractCryptic 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
Description23 pages, 3 figures, 5 tables, supplementary data https://doi.org/10.1093/zoolinnean/zlaa014.-- This is a pre-copyedited, author-produced version of an article accepted for publication in Zoological Journal of the Linnean Society following peer review. The version of record Global biodiversity of the genus Ommastrephes (Ommastrephidae: Cephalopoda): an allopatric cryptic species complex, Fernando Á. Fernández-Álvarez, Heather E. Braid, Chingis M. Nigmatullin, Kathrin S. R. Bolstad, Manuel Haimovici, Pilar Sánchez, Kurichithara K. Sajikumar, Nadakkal Ragesh, Roger Villanueva, 2020 is available online at: https://doi.org/10.1093/zoolinnean/zlaa014
Publisher version (URL)https://doi.org/10.1093/zoolinnean/zlaa014
Identifiersdoi: 10.1093/zoolinnean/zlaa014
issn: 0024-4082
e-issn: 1096-3642
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