Based on a review of the literature, complemented by original observations at sea made by the authors during the
past 34 years, the cetacean fauna in the Red Sea appears to be composed of a total of 16 species: three Mysticetes
(Bryde’s whale, Balaenoptera edeni; Omura’s whale, B. omurai; and humpback whale, Megaptera novaeangliae) and
13 Odontocetes (dwarf sperm whale, Kogia sima; killer whale, Orcinus orca; false killer whale, Pseudorca crassidens;
short-finned pilot whale, Globicephala macrorhynchus; Risso’s dolphin, Grampus griseus; Indian Ocean humpback
dolphin, Sousa plumbea; rough-toothed dolphin, Steno bredanensis; Indo-Pacific bottlenose dolphin, Tursiops
aduncus; common bottlenose dolphin, T. truncatus; pantropical spotted dolphin, Stenella attenuata; spinner dolphin,
S. longirostris; striped dolphin, S. coeruleoalba; Indo-Pacific common dolphin, Delphinus delphis tropicalis).
This review presents the very first documented and confirmed sightings of B. omurai, K. sima and S. bredanensis
in the Red Sea. Of all the above species, however, only nine (Bryde’s whale, false killer whale, Risso’s dolphin, Indian
Ocean humpback dolphin, Indo-Pacific bottlenose dolphin, common bottlenose dolphin, pantropical spotted dolphin,
spinner dolphin, and Indo-Pacific common dolphin) appeared to occur regularly in the Red Sea, the remaining seven
only occurring sporadically as vagrants from the Indian Ocean. Even regular species appeared not to be uniformly
distributed throughout the Red Sea, e.g., with Indo-Pacific common dolphins mostly limited to the southern portion
of the region, and the Gulf of Suez only hosting the two bottlenose dolphin species and Indian Ocean humpback
dolphins. No convincing evidence was found of the Red Sea occurrence of two whale species mentioned in the
literature: the common minke whale, Balaenoptera acutorostrata, and the sperm whale, Physeter macrocephalus.
The absence from the region of deep diving species (e.g., Ziphiidae and the sperm whale) can be explained by the
geomorphology of the Straits of Bab al Mandab, with its extended shallow sill likely to discourage incursions by
such species into the Red Sea. The coordinated effort and the different expertise of the authors has contributed to
amending previous mistakes and inaccuracies, verifying and validating specimen identification, highlighting features
of relevance for species taxonomy and, most importantly, drawing a fundamental baseline to inform conservation of
cetaceans in the Red Sea.