Bryde's whale or the Bryde's whale complex (/ˈbruːdə/ BROO-də) putatively comprises two species of rorqual and maybe three. The "complex" means the number and classification remains unclear because of a lack of definitive information and research. The common Bryde's whale (Balaenoptera brydei, Olsen, 1913) is a larger form that occurs worldwide in warm temperate and tropical waters, and the Sittang or Eden's whale (B. edeni, Anderson, 1879) is a smaller form that may be restricted to the Indo-Pacific. Also, a smaller, coastal form of B. brydei is found off southern Africa, and perhaps another form in the Indo-Pacific differs in skull morphology, tentatively referred to as the Indo-Pacific Bryde's whale. The recently described Omura's whale (B. omurai, Wada et al. 2003), was formerly considered a "pygmy" form of Bryde's, but is now recognized as a distinct species.
Balaenoptera brydei, Baloenoptera brydei
The taxonomy (number and identity of species and subspecies) of Bryde's Whales is not yet resolved. IUCN Guidelines note that species should not be classified as Data Deficient for reasons of taxonomic uncertainty alone. Therefore, the Bryde’s Whale is assessed here as one species, with most individuals belonging to the larger pelagic subspecies B. e. brydei. The large-type Bryde’s Whale B. e. brydei has been reduced by whaling, but not to the extent that would result in an IUCN Red List threatened category within its worldwide range. The taxon is therefore listed as Least Concern. There are several subpopulations or subspecies that should be assessed separately and may warrant threatened categories. One of these, the Gulf of Mexico Whale, has been listed as Critically Endangered on the Red List
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