Volume 37, Issue 2 p. 577-610
ARTICLE

A new species of baleen whale (Balaenoptera) from the Gulf of Mexico, with a review of its geographic distribution

Patricia E. Rosel

Corresponding Author

Patricia E. Rosel

Southeast Fisheries Science Center, National Marine Fisheries Service, NOAA, Lafayette, Louisiana

Correspondence

Patricia Rosel, Southeast Fisheries Science Center, National Marine Fisheries Service, NOAA, 646 Cajundome Boulevard, Lafayette, Louisiana 70506.

Email: [email protected]

Contribution: Conceptualization, Data curation, Formal analysis, Funding acquisition, ​Investigation, Methodology, Supervision, Validation, Visualization, Writing - original draft, Writing - review & editing

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Lynsey A. Wilcox

Lynsey A. Wilcox

Southeast Fisheries Science Center, National Marine Fisheries Service, NOAA, Lafayette, Louisiana

Contribution: Data curation, Formal analysis, ​Investigation, Methodology, Writing - review & editing

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Tadasu K. Yamada

Tadasu K. Yamada

National Museum of Nature and Science, Tsukuba-shi, Ibaraki, Japan

Contribution: Formal analysis, ​Investigation, Methodology, Writing - review & editing

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Keith D. Mullin

Keith D. Mullin

Southeast Fisheries Science Center, National Marine Fisheries Service, NOAA, Pascagoula, Mississippi

Contribution: Conceptualization, ​Investigation, Visualization, Writing - review & editing

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First published: 10 January 2021
Citations: 43

[Corrections added on 11 Febuary 2021, after first online publication: Additional text is included.]

Abstract

Bryde's-like whales are a complex of medium-sized baleen whales that occur in tropical waters of all three major ocean basins. Currently, a single species of Bryde's whale, Balaenoptera edeni Anderson, 1879, is recognized, with two subspecies, Eden's whale, B. edeni edeni and Bryde's whale, B. edeni brydei (Olsen, 1913), although some authors have recognized these as separate species. Recently, a new, evolutionarily divergent lineage of Bryde's-like whale was identified based on genetic data and was found to be restricted primarily to the northern Gulf of Mexico (GOMx). Here, we provide the first morphological examination of a complete skull from these whales and identify diagnostic characters that distinguish it from the other medium-sized baleen whale taxa. In addition, we have increased the number of genetic samples of these Bryde's-like whales in the GOMx from 23 to 36 individuals, all of which matched the GOMx lineage. A review of Bryde's-like whale records in the Caribbean and greater Atlantic supports an isolated distribution for this unique lineage, augmenting the genetic and morphological body of evidence supporting the existence of an undescribed species of Balaenoptera from the Gulf of Mexico.

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