Osbornodon iamonensis
Encyclopedia
Osbornodon iamonensis is an extinct species of bone-crushing Hesperocyoninae
, a predecessor of modern dogs that were endemic to North America
and which lived from the Orellan
age of the Early Oligocene to Early Miocene
epoch 23.6—16.3 Ma and existed for approximately .
O. iamonensis was named by E. H. Sellards in 1916 for Lake Iamonia in northern Florida
.
(1994), X. Wang and Richard H. Tedford
(1996) and Hayes (2000). It was assigned to Mesocyon
by Sellards (1916); to Cynodesmus
by Simpson (1932), Olsen (1956) and Wilson (1960); and to Osbornodon
by Wang (1994), Wang and Tedford (1996) and Hayes (2000).
Hesperocyoninae
Hesperocyoninae is a subfamily of extinct canids.-Taxonomic history:Hesperocyoninae was named by Martin . The members of this subfamily were reassigned to the family Canidae by Xiaoming Wang in 1999....
, a predecessor of modern dogs that were endemic to North America
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...
and which lived from the Orellan
Orellan
The Orellan North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology , typically set from 33,900,000 to 33,300,000 years BP, a period of . It is usually considered to fall within the Early Oligocene...
age of the Early Oligocene to Early Miocene
Early Miocene
The Early Miocene is a sub-epoch of the Miocene Epoch made up of two stages: the Aquitanian and Burdigalian stages....
epoch 23.6—16.3 Ma and existed for approximately .
O. iamonensis was named by E. H. Sellards in 1916 for Lake Iamonia in northern Florida
Florida
Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...
.
Taxonomy
Osbornodon iamonensis was named by E. H. Sellards (1916). Its type is FGS 5082. It was recombined as Cynodesmus iamonensis by Simpson (1932), Olsen (1956) and Wilson (1960); it was recombined as Osbornodon iamonensis by Xiaoming WangXiaoming Wang
Xiaoming Wang is a noted paleontologist and geologist born in People's Republic of China living in the United States.-Area of expertise:Dr. Wang specializes in the fossil evolution, systematics, and phylogeny of mammals of the Cenozoic...
(1994), X. Wang and Richard H. Tedford
Richard H. Tedford
Richard Hall Tedford was Curator Emeritus in the Department of Vertebrate Paleontology of the American Museum of Natural History in New York City, having been named as curator in 1969....
(1996) and Hayes (2000). It was assigned to Mesocyon
Mesocyon
Mesocyon is an extinct genus of terrestrial carnivore within the family Canidae, subfamily Hesperocyoninae, which inhabited North America from the Early Oligocene 33.9—20.6 Ma, existing for approximately ....
by Sellards (1916); to Cynodesmus
Cynodesmus
Cynodesmus is an extinct genus of omnivorous canine which inhabited North America during the Oligocene living from 33.3—-26.3 Ma and existed for approximately ....
by Simpson (1932), Olsen (1956) and Wilson (1960); and to Osbornodon
Osbornodon
Osbornodon is an extinct genus of bone-crushing canid that were endemic to North America and which lived from the Orellan age of the Early Oligocene to Early Miocene epoch 33.9—15.97 Ma and existed for approximately ....
by Wang (1994), Wang and Tedford (1996) and Hayes (2000).
Morphology
Two fossil specimens were examined by Legendre and Roth for body mass.- Specimen 1 was estimated to have weighed 17.6 kg (38.8 lb).
- Specimen 2 was estimated to have weighed 16.2 kg (35.7 lb).
Fossil distribution
- Griscom Plantation Site, northeast Leon County, FloridaLeon County, FloridaLeon County is a county located in the state of Florida, named after the Spanish explorer Juan Ponce de León. At the 2010 Census, the population was 275,487. The county seat of Leon County is Tallahassee which also serves as the state capital. The county seat is home to two of Florida's major...
. ~23.6—18.8 Mya. - Thomas Farm siteThomas Farm SiteThe Thomas Farm site is an Early Miocene, Hemingfordian assemblage of vertebrate fossils located in Gilchrist County, northern Florida.The Thomas Farm site is one of the richest terrestrial deposits of Miocene vertebrates in the 18 Ma range found in eastern North America according to the Florida...
in Gilchrist County, FloridaGilchrist County, FloridaGilchrist County is a rural county located in the U.S. state of Florida. As of 2000, the population was 14,437. The U.S. Census Bureau 2005 estimate for the county is 16,402. Gilchrist County has only one traffic light in the entire county and has no road with more than one lane of traffic...
. ~21.7 Mya. - The remaining two specimens were found in the Dry Creek Prospect B Site and Bridgeport Quarries Site of NebraskaNebraskaNebraska is a state on the Great Plains of the Midwestern United States. The state's capital is Lincoln and its largest city is Omaha, on the Missouri River....
. ~20.6—16.3 Mya.