Lagenorhynchus

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Lagenorhynchus
Temporal range: Pliocene to Recent[1]
Lagenorhynchus albirostris
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Infraorder: Cetacea
Family: Delphinidae
Genus: Lagenorhynchus
Gray, 1846
Type species
Delphinus albirostris [2]

Gray, 1846
Species

Lagenorhynchus albirostris
Lagenorhynchus acutus
Lagenorhynchus obliquidens
Lagenorhynchus obscurus
Lagenorhynchus australis
Lagenorhynchus cruciger
†Lagenorhynchus harmatuki

Lagenorhynchus is a genus of oceanic dolphins in the infraorder Cetacea, presently containing six extant species.[3] However, there is consistent molecular evidence that the genus is polyphyletic[4] and several of the species are likely to be moved to other genera. In addition, the extinct species Lagenorhynchus harmatuki is also classified in this genus.[5]

Etymology

The name Lagenorhynchus derives from the

Tursiops
.

Taxonomy

There is compelling

phylogenetic molecular evidence that the genus Lagenorhynchus is polyphyletic, in that it currently contains several species that are not closely related.[6]
orca (subfamily Orcininae).[7]

The remaining four species in the genus Lagenorhynchus—the

Lissodelphininae subfamily, in studies of molecular phylogeny,[8][4] together with the right whale dolphin and the four species of the genus Cephalorhynchus (including Hector's dolphin). Some authors have suggested these four species be placed in the resurrected genus Sagmatias.[6][4] However, other molecular studies place the hourglass and Peale's dolphins, phylogenetically, within the genus Cephalorhynchus and do not agree with inclusion in a new genus (together with Pacific white-sided dolphin and dusky dolphin).[8]

This phylogeny is supported by acoustic and morphological data; both the hourglass and Peale's dolphins share, with the other species of Cephalorhynchus, a distinctive type of

Phocoenidae) and the pygmy sperm whales (Kogiidae), but is not found among other dolphins. According to Schevill & Watkins 1971, Peale's dolphin, and the other Cephalorhynchus species, are the only dolphins that do not "whistle"; presumably, this would be the case for hourglass dolphins, as well. Peale's dolphin also shares with several Cephalorhynchus species the possession of a distinct white marking behind the pectoral (“armpit”) fin.[citation needed
]

The melon-headed whale was first classified as member of the genus Lagenorhynchus, but was later moved to its own genus, Peponocephala.[11]

Notes

  1. ^ "Fossilworks: Lagenorhynchus".
  2. OCLC 62265494
    .
  3. ^ "List of marine mammal species". Society for Marine Mammalogy. Retrieved 30 December 2021.
  4. ^ a b c LeDuc, Perrin & Dizon 1999
  5. ^ "Fossilworks: Lagenorhynchus harmatuki". fossilworks.org. Retrieved 17 December 2021.
  6. ^
    S2CID 92421374
    .
  7. PMID 31633766
    .
  8. ^ a b May-Collado & Agnarsson 2006
  9. ^ Tougaard & Kyhn 2010
  10. ^ Kyhn et al. 2010
  11. ^ Nishiwaki, M. and K.S. Norris (1966). "A new genus, Peponocephala, for the odontocete cetacean species (Electra electra)". The Scientific Reports of the Whales Research Institute. 20: 95–100.

References

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