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{{Short description|Genus of mammals}}{{For|the daisy-like plant genus|Cephalorrhynchus}}{{Automatic taxobox! Image !! Scientific name !! Common name !! Distribution

Holocene}}| image = Commdolph01.jpg| image_caption = Commerson's dolphin| taxon = Cephalorhynchus	John Edward Gray>Gray, 1846	Cephalorhynchus heavisidii>Delphinus heavisidii {{MSW3|id=14300036}}| type_species_authority = Gray, 1828| subdivision_ranks = Species	Commerson's dolphin>C. commersoniiC. eutropiaC. heavisidiiC. hectori}}Cephalorhynchus is a genus in the dolphin family Delphinidae. Extant species It consists of four species:{| class="wikitable"
120px)	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
120px)	Chilean dolphin	C. eutropia	coast of Chile
120px)	Heaviside's dolphin	C. heavisidii	coast of northern Namibia at 17°S and as far south as the southern tip of South Africa
120px)	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 suggest 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.JOURNAL, May-Collado, Laura, Agnarsson, Ingi, 2006, Cytochrome b and Bayesian inference of whale phylogeny,weblink Molecular Phylogenetics and Evolution, 38, 2, 344–54, 10.1016/j.ympev.2005.09.019, 1055-7903, 441745572, 16325433, 2 February 2013, According to a study in 1971, Peale's dolphin and the Cephalorhynchus species are the only dolphins that do not whistle (no acoustic data are available for the hourglass dolphin). Peale's dolphin also shares with several Cephalorhynchus species the possession of a distinct white "armpit" marking behind the pectoral fin.JOURNAL, Schevill, W.E., Watkins, W.A., 15 January 1971, Pulsed sounds of the porpoise Lagenorhynchus australis, Breviora, 366, 1–10, 0006-9698, 80876226,

References

{{Reflist}}{{Cetacea|O.}}{{Odontoceti|D.}}{{Taxonbar|from=Q583001}}{{Authority control}}{{whale-stub}}