''Meherrinia'' is an extinct

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

of inioid

river dolphin River dolphins are a polyphyletic group of fully aquatic mammals that reside exclusively in freshwater or brackish water. They are an informal grouping of dolphins, which itself is a paraphyletic group within the infraorder Cetacea. Extant riv ...

from the

Meherrin River The Meherrin River is a long 6th order tributary to the Chowan River that joins in Hertford County, North Carolina. A twenty-foot-high dam on the river creates a reservoir in Emporia. For most of its length, the Meherrin is not large enough f ...

, North Carolina, in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...

. First described in 2012, the dolphin is, in most respects, intermediate in form between the living

Amazon river dolphin The Amazon river dolphin (''Inia geoffrensis''), also known as the boto, bufeo or pink river dolphin, is a species of toothed whale classified in the family Iniidae. Three subspecies are currently recognized: ''I. g. geoffrensis'' (Amazon river ...

and the La Plata dolphin, although it is probably more closely related to the former. However, the fossil was discovered in what are believed to be marine deposits, dating from the late

Miocene The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and mea ...

, whereas the Amazon river dolphin is an exclusively freshwater species. ''Meherrinia'' therefore may be, as of 2012, the only known marine genus of the family Iniidae. Only one species is known.

References

Fossils of the United States Prehistoric toothed whales Prehistoric cetacean genera Fossil taxa described in 2012 Miocene cetaceans {{paleo-whale-stub