Cephalorhynchus

Cephalorhynchus is a genus in the dolphin family Delphinidae.

Extant species

It consists of six species:

Image	Common name	Scientific name	Distribution
	Peale's dolphin	C. australis	Southern South America
	Commerson's dolphin	C. commersonii	Argentina including Puerto Deseado, in the Strait of Magellan and around Tierra del Fuego, and near the Falkland Islands, near the Kerguelen Islands in the southern part of the Indian Ocean
	Hourglass dolphin	C. cruciger	Argentina, Chile, New Zealand
	Chilean dolphin	C. eutropia	coast of Chile
	Heaviside's dolphin	C. heavisidii	coast of northern Namibia at 17°S and as far south as the southern tip of South Africa
	Hector's dolphin	C. hectori	coastal regions of New Zealand

The species have similar physical features—they are small, generally playful, blunt-nosed dolphins—but they are found in distinct geographical locations.

A phylogenetic analysis in 2006 indicated the two species traditionally assigned to the genus Lagenorhynchus, the hourglass dolphin L. cruciger and Peale's dolphin L. australis are actually phylogenetically nested among the species of Cephalorhynchus, and they suggested that these two species should be transferred to the genus Cephalorhynchus. Some acoustic and morphological data support this arrangement, at least with respect to Peale's dolphin.<ref>Template:Cite journal</ref> In 2025 those two species were transferred to Cephalorhynchus.<ref>Template:Cite web</ref><ref>Template:Cite journal</ref>

According to a study in 1971, the Cephalorhynchus species are the only dolphins that do not whistle (no acoustic data are available for the hourglass dolphin). Peale's dolphin also shared with several Cephalorhynchus species the possession of a distinct white "armpit" marking behind the pectoral fin.<ref>Template:Cite journal</ref>

References

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