''Phocageneus'' is an
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of
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 ...
belonging to
Squalodelphinidae
Squalodelphinidae is a family of primitive platanistoid river dolphins found in marine deposits in the eastern Pacific, western Atlantic, and Europe.
Description
Distinguishing features of Squalodelphinidae include a moderately elongated and ta ...
. Specimens have been found in the middle Miocene
Calvert Formation
The Calvert Formation is a geologic formation in Maryland, Virginia, and Delaware. It preserves fossils dating back to the early to middle Miocene epoch of the Neogene period. The formation is a destination for amateur fossil hunters as well as pr ...
of Maryland and Virginia.
References
{{Taxonbar, from=Q49001330
Miocene cetaceans
Prehistoric cetacean genera
Miocene mammals of North America
Paleontology in Maryland
Paleontology in Virginia
Fossil taxa described in 1869
Taxa named by Joseph Leidy