Part 4

Prodelphinus attenuatus: Tropical and sub-tropical parts of Atlantic Ocean; 6 feet.

P. plagiodon: Atlantic coast of North America from Cape Hatteras, Gulf of Mexico; 7 feet.

P. froenatus: The Bridled Dolphin. Atlantic and Indian Oceans; about 6 feet.

P. malayanus: East Indies; more than 6 feet.

P. coeruleoalbus: South America, near mouth of River Plate; about 4 feet.

P. euphrosyne: Atlantic Ocean to South Africa; about 8 feet.

Genus Tursiops

T. truncatus: The Bottle-Nosed Dolphin. Has a short well-defined snout 2 or 3 inches long. There is a prominent fin in the middle of the back. Reaches a length of 11 to 12 feet. Has a very wide range. Commonest along the Atlantic coast of America from Maine to Florida. Found in Bay of Biscay, in the Mediterranean Sea, and in New Zealand waters.

T. abusalam: Red Sea; 6 feet.

T. catalania: Indian and Australian seas.

Genus Steno

S. rostratus: The Rough-Toothed Dolphin. Long-beaked, with roughened or furrowed teeth. Atlantic and Indian Oceans; about 8 feet.

Genus Orcaella

O. brevirostris: Irrawaddy River Dolphin. From Bay of Bengal, Vizagapatam, Singapore, and Siam (i.e., S.E. Asia).

Genus Lissodelphis or Tursio

Lissodelphis: The Right Whale Dolphin. All oceans.

Genus Grampus

G. griseus: Risso’s Dolphin. North Atlantic, Mediterranean, New Zealand, and Cape of Good Hope; 12 to 13 feet.

Genus Cephalorhynchus

These are the Southern, mostly cold-water dolphins.

C. heavisidei: Heaviside’s Dolphin. Cape of Good Hope; about 4 feet.

C. hectori: Hector’s Dolphin. New Zealand; about 6 feet.

C. albiventris: White-Bellied Dolphin. A very rare form, found off the coast of South America; about 4 feet 6 inches.

C. commersonii: Commerson’s Dolphin; also known as the Piebald Porpoise or Le Jacobite. Southern oceans; up to 5¼ feet.

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.