Finless porpoise: Difference between revisions
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| taxon = Neophocaena |
| taxon = Neophocaena |
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| authority = [[Theodore Sherman Palmer|Palmer]], 1899 |
| authority = [[Theodore Sherman Palmer|Palmer]], 1899 |
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| type_species = [[Neophocaena phocaenoides]] |
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| subdivision_ranks = Species |
| subdivision_ranks = Species |
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| subdivision = ''[[Neophocaena asiaeorientalis]]''<br /> |
| subdivision = ''[[Neophocaena asiaeorientalis]]''<br /> |
Revision as of 00:17, 9 February 2022
Finless porpoise | |
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Neophocaena sunameri at Miyajima Public Aquarium | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Artiodactyla |
Infraorder: | Cetacea |
Family: | Phocoenidae |
Genus: | Neophocaena Palmer, 1899 |
Type species | |
Neophocaena phocaenoides | |
Species | |
Neophocaena asiaeorientalis | |
For all three finless porpoise species |
Neophocaena is a genus of porpoise native to the Indian and Pacific oceans, as well as the freshwater habitats of the Yangtze River basin in China. They are commonly known as finless porpoises. Genetic studies indicate that Neophocaena is the most basal living member of the porpoise family.[1]
There are three species in this genus:[2][3]
Image | Scientific name | Common name | Distribution |
---|---|---|---|
Neophocaena asiaeorientalis | Yangtze finless porpoise | Yangtze River basin in China | |
Neophocaena phocaenoides | Indo-Pacific finless porpoise | Persian Gulf east to the Taiwan Strait, south to Indonesia | |
Neophocaena sunameri | East Asian finless porpoise | Taiwan Strait north to the Yellow Sea, east to the east coast of Japan |
Description
The finless porpoises are the only porpoises to lack a true dorsal fin. Instead there is a low ridge covered in thick skin bearing several lines of tiny tubercles. In addition, the forehead is unusually steep compared with those of other porpoises. With fifteen to twenty-one teeth in each jaw, they also have, on average, fewer teeth than other porpoises, although there is some overlap, and this is a not a reliable means of distinguishing them.[4]
References
- ^ Rosel, P. E.; et al. (1995). "Phylogenetic relationships among the true porpoises (Cetacea: Phocoenidae)". Molecular Phylogenetics and Evolution. 4 (4): 463–474. doi:10.1006/mpev.1995.1043. PMID 8747302.
- ^ Mammal Diversity Database (2021-08-10), Mammal Diversity Database, Zenodo, retrieved 2021-08-28
- ^ "Finless Porpoises: Neophocaena phocaenoides, N. asiaeorientalis". Encyclopedia of Marine Mammals: 372–375. 2018-01-01. doi:10.1016/B978-0-12-804327-1.00129-1.
- ^ Jefferson, T. A.; Hung, S. K. (2004). "Neophocaena phocaenoides". Mammalian Species. 746: 1–12. doi:10.1644/746. S2CID 198125391.