Genus Lagenorhynchus
Characterized by great number of vertebrae (80 to 90), great length of transverse and vertical bony processes from vertebrae, moderately pointed high back fin having concave posterior border; the beak is short.
L. acutus: The White-Sided Dolphin. North Atlantic; about 9 feet.
L. australis: Peale’s Porpoise. Cape Horn, Chile, Patagonia, Falkland Islands; over 7 feet.
L. albirostris: The White-Beaked Dolphin. North Atlantic; 9 to 10 feet.
L. cruciger: South Pacific; 5 to 6 feet.
L. fitzroyi: Fitzroy’s Dolphin. Southern end of South America; 5 feet 4 inches.
L. obscurus: Dusky Dolphin. South Africa, New Zealand, Falkland Islands; 7 feet.
Genus Sotalia
Concentrated in the tropical seas or rivers of South America, Africa, India, and the Far East.