Bryde's whale or
Bryde's whale complex () 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), a larger form that occurs worldwide in warm temperate and tropical waters, and the
sittang or
Eden's whale (
B. edeni, Anderson, 1879) a smaller form that may be restricted to the
Indo-Pacific. There is also a smaller, coastal form of
B. brydei off southern Africa, and perhaps another form in the Indo-Pacific that 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.