“Cephalorhynchus”的意思、由来-开放百科全书

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Cephalorhynchus

释义

Extant species
References

{{for|the daisy-like plant genus|Cephalorrhynchus}}{{Automatic taxobox
| image = Commdolph01.jpg
| image_caption = Commerson's dolphin
| taxon = Cephalorhynchus
| authority = Gray, 1846
| subdivision_ranks = Species
| subdivision =C. commersonii
C. eutropia
C. heavisidii
C. hectori
}}

Cephalorhynchus is a genus in the dolphin family Delphinidae.

Extant species

It consists of four species:

Image	Scientific name	Common name
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
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 by {{Harvnb|May-Collado|Agnarsson|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.

According to {{Harvnb|Schevill|Watkins|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.

References

{{Cite journal

| last1 = May-Collado | first1 = Laura
| last2 = Agnarsson | first2 = Ingi
| title = Cytochrome b and Bayesian inference of whale phylogeny
| year = 2006 | journal = Molecular Phylogenetics and Evolution | volume = 38 | pages = 344–54
| url = http://www.theridiidae.com/uploads/6/6/8/0/6680387/maycolladoandagnarsson2006.pdf
| accessdate = 2 February 2013 | doi = 10.1016/j.ympev.2005.09.019 | issn = 1055-7903 | oclc = 441745572 | ref = harv | pmid=16325433 | issue=2}}

{{Cite journal

| last1 = Schevill | first1 = W.E.
| last2 = Watkins | first2 = W.A.
| title = Pulsed sounds of the porpoise Lagenorhynchus australis
|date=15 January 1971 | journal = Breviora | volume = 366 | pages = 1–10
| oclc = 80876226 | issn = 0006-9698 | ref = harv}}{{Cetacea|O.}}{{Taxonbar|from=Q583001}}{{whale-stub}}

5 : Cephalorhynchus|Oceanic dolphins|Cetacean genera|Animals that use echolocation|Taxa named by John Edward Gray

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