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Odobenid
Odobenidae is a family of pinnipeds. The only living species is the walrus (''Odobenus rosmarus''). In the past, however, the group was much more diverse, and includes more than a dozen fossil genera. Taxonomy All genera, except ''Odobenus'', are extinct. *†''Archaeodobenus'' *†''Prototaria'' *†''Proneotherium'' *†'' Nanodobenus'' *†''Neotherium'' *†''Imagotaria'' *†''Kamtschatarctos'' *†''Pelagiarctos'' *†''Pontolis'' *†'' Pseudotaria'' *†''Titanotaria'' *Clade Neodobenia **†''Gomphotaria'' **Subfamily Dusignathinae ***†'' Dusignathus'' **Subfamily Odobeninae ***†''Aivukus'' ***†''Ontocetus'' ***†''Pliopedia'' ***†'' Protodobenus'' ***†''Valenictus'' ***''Odobenus The walrus (''Odobenus rosmarus'') is a large flippered marine mammal with a discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern Hemisphere. The walrus is the only living species in the fami ...'' In re-analyzing ''Pelagiar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Titanotaria
''Titanotaria'' is a genus of late, basal Odobenidae, walrus from the Miocene of Orange County, California. Unlike much later odobenids, it lacked tusks. ''Titanotaria'' is known from an almost complete specimen which serves as the holotype for the only recognized species, ''Titanotaria orangensis'', it is the best preserved fossil walrus currently known. History and naming Although the holotype specimen (OCPC 11141) of ''Titanotaria'' had been discovered in 1993 and represents one of the most complete fossil walrus known, little attention was given to the material for over 20 years. The first mention of the fossils in peer-reviewed literature came in 2017 with Barboza and colleagues publishing a faunal list of the Oso Member of the Capistrano Formation, where ''Titanotaria'' had been found. Specifically, the fossilized bones were collected from the town of Lake Forest, California, Lake Forest, Orange County, California, during the construction of the Saddleback Church. A full des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Walrus
The walrus (''Odobenus rosmarus'') is a large pinniped, flippered marine mammal with a discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern Hemisphere. The walrus is the only living species in the family (biology), family Odobenidae and genus ''Odobenus''. This species is subdivided into two subspecies: the Atlantic walrus (''O. r. rosmarus''), which lives in the Atlantic Ocean, and the Pacific walrus (''O. r. divergens''), which lives in the Pacific Ocean. Adult walrus are characterised by prominent tusks and whiskers, and their considerable bulk: adult males in the Pacific can weigh more than and, among pinnipeds, are exceeded in size only by the two species of elephant seals. Walruses live mostly in shallow waters above the continental shelves, spending significant amounts of their lives on the sea ice looking for benthic zone, benthic bivalvia, bivalve mollusks to eat. Walruses are relatively long-lived, social animals, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Odobenus
The walrus (''Odobenus rosmarus'') is a large flippered marine mammal with a discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern Hemisphere. The walrus is the only living species in the family Odobenidae and genus ''Odobenus''. This species is subdivided into two subspecies: the Atlantic walrus (''O. r. rosmarus''), which lives in the Atlantic Ocean, and the Pacific walrus (''O. r. divergens''), which lives in the Pacific Ocean. Adult walrus are characterised by prominent tusks and whiskers, and their considerable bulk: adult males in the Pacific can weigh more than and, among pinnipeds, are exceeded in size only by the two species of elephant seals. Walruses live mostly in shallow waters above the continental shelves, spending significant amounts of their lives on the sea ice looking for benthic bivalve mollusks to eat. Walruses are relatively long-lived, social animals, and they are considered to be a " keystone spe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Walrus
The walrus (''Odobenus rosmarus'') is a large pinniped, flippered marine mammal with a discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern Hemisphere. The walrus is the only living species in the family (biology), family Odobenidae and genus ''Odobenus''. This species is subdivided into two subspecies: the Atlantic walrus (''O. r. rosmarus''), which lives in the Atlantic Ocean, and the Pacific walrus (''O. r. divergens''), which lives in the Pacific Ocean. Adult walrus are characterised by prominent tusks and whiskers, and their considerable bulk: adult males in the Pacific can weigh more than and, among pinnipeds, are exceeded in size only by the two species of elephant seals. Walruses live mostly in shallow waters above the continental shelves, spending significant amounts of their lives on the sea ice looking for benthic zone, benthic bivalvia, bivalve mollusks to eat. Walruses are relatively long-lived, social animals, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ontocetus
''Ontocetus'' is an extinct genus of walrus, an aquatic carnivoran of the family Odobenidae, endemic to coastal regions of the southern North Sea and the southeastern coastal regions of the U.S. during the Miocene-Pleistocene. It lived from 13.6 mya—300,000 years ago, existing for approximately . Taxonomy The type species, ''Ontocetus emmonsi'', was named by Joseph Leidy in 1859 on the basis of a single tusk-like tooth (USNM 329064) collected by Ebenezer Emmons from the early Pliocene (Zanclean) Yorktown Formation of North Carolina. In the meantime, marine mammals fossils were being unearthed in Neogene deposits in the vicinity of Antwerp, Belgium as well as Suffolk, England. One of these fossils was identified as an odobenid and named ''Alachtherium cretsii.'' in 1867. An isolated tooth (RBINS 2892) was named ''Trichechodon koninckii'' in 1871. The fossils from Suffolk were named ''Trichechodon huxleyi'' in 1865. For decades, however, ''Ontocetus'' was tossed aside as a phy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nanodobenus
''Nanodobenus'' is an extinct genus of pinniped that lived approximately 15.97 to 7.246 mya during the Miocene in what is now Baja California Sur, Mexico. It belonged to the family Odobenidae, the only extant species of which is the walrus. Discovery ''N. arandai'' is known from a partially complete left mandible and a right calcaneum bone, discovered in the Torgugas Formation in Mexico. Description ''Nanodobenus'' were more similar in appearance to modern fur seals and sea lions than walruses. They lacked the long tusks of walruses, and were more slender and smaller than their modern relatives. Despite the general increase in body size of odobenids from the Miocene to Pliocene The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58 [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeodobenus
''Archaeodobenus'' is an extinct genus of pinniped that lived during the Late Miocene of what is now Japan. It belonged to the Odobenidae family, which is today only represented by the walrus, but was much more diverse in the past, containing at least 16 genera. Unlike the modern walrus, ''Archaeodobenus'' did not have tusks but instead had canines of moderate size, and looked more like a sea lion. Discovery The first known specimen was collected in 1977 from the Ichibangawa Formation in Tobetsu Town on the island of Hokkaido. The specimen consists of a partial skull, vertebrae, and limb bones, and was made the holotype specimen of the new genus and species ''A. akamatsui'' by the Japanese palaeontologists Yoshihiro Tanaka and Naoki Kohno in 2015. The generic name consists of ''archaio-'', the Greek word for ancient, and the generic name of the walrus, ''Odobenus''; in full, "ancient walrus." The specific name honors Morio Akamatsu, a curator of the Hokkaido Museum. The ho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erignathus
The bearded seal (''Erignathus barbatus''), also called the square flipper seal, is a medium-sized pinniped that is found in and near to the Arctic Ocean. It gets its generic name from two Greek words (''eri'' and ''gnathos'') that refer to its heavy jaw. The other part of its Linnaean name means bearded and refers to its most characteristic feature, the conspicuous and very abundant whiskers. When dry, these whiskers curl very elegantly, giving the bearded seal a "raffish" look. Bearded seals are the largest northern phocid. They have been found to weigh as much as with the females being the largest. However, male and female bearded seals are not very dimorphic. The only member of the genus ''Erignathus'', the bearded seal is unique in that it is an intermediate. Bearded seals belong to the family Phocidae which contains two subfamilies: Phocinae and Monachinae. The bearded seal possesses characteristics of both of these subfamilies. Fossils first described in 2002 indicat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proneotherium
''Proneotherium'' is an extinct genus of pinniped that lived approximately 20.43 to 15.97 mya during the Early Miocene in what is now Oregon, U.S. It belonged to the family Odobenidae, the only extant species of which is the walrus. Discovery Four specimens of ''Proneotherium'' were discovered in the Astoria Formation of Lincoln County, Oregon, U.S. These specimens included cranial and postcranial remains and are all believed to be adult male animals. Description ''Proneotherium'' were more similar in appearance to modern fur seals and sea lions than walruses. They lacked the long tusks of walruses, and were more slender and smaller than their modern relatives. Autapomorphies of ''Proneotherium'' fossils include a continuous, horizontal crest connecting the mastoid and paroccipital processes of the skull. The teeth are also less secodont in function and appearance than more basal species. This likely represents the slow shift from a piscivorous diet to the mollusk-based d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kamtschatarctos
''Kamtschatarctos'' is an extinct genus of pinniped that lived approximately 15.97 to 11.608 mya during the Early Miocene in the Kavran-Ukhtolok Bay of Russia's Kamchatka Peninsula. It belonged to the family Odobenidae, the only extant species of which is the walrus The walrus (''Odobenus rosmarus'') is a large pinniped, flippered marine mammal with a discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern Hemisphere. The walrus is the only living species in .... Discovery ''Kamtschatarctos sinelnikovae'' is known from a partially complete skeleton, discovered in the Etolon Formation in Russia. Taxonomy ''Kamtschatarctos'' is a relatively basal species of odobenid. References {{Taxonbar, from=Q48465840 Pinnipeds of Europe Odobenids Prehistoric pinnipeds Prehistoric carnivoran genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monachus
The Mediterranean monk seal (''Monachus monachus'') is a monk seal belonging to the family Phocidae. , it is estimated that fewer than 700 individuals survive in three or four isolated subpopulations in the Mediterranean, (especially) in the Aegean Sea, the archipelago of Madeira and the Cabo Blanco area in the northeastern Atlantic Ocean. It is believed to be the world's rarest pinniped species. This is the only species in the genus ''Monachus''. Description This species of seal grows from approximately long at birth up to an average of as adults, females slightly shorter than males. Males weigh an average of and females weigh , with overall weight ranging from . They are thought to live up to 45 years old; the average life span is thought to be 20 to 25 years old and reproductive maturity is reached at around age four. The monk seals' pups are about long and weigh around , their skin being covered by 1–1.5 centimeter-long, dark brown to black hair. On their bellies, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Callorhinus
''Callorhinus'' is a genus of sea lion. It contains the living northern fur seal ''(Callorhinus ursinus)'' as well as the extinct ''Callorhinus gilmorei'' and an unnamed species, both from the Pliocene and very beginning of the Pleistocene. ''Callorhinus'' may be a sister genus to the extinct giant otariid, ''Thalassoleon ''Thalassoleon'' ("sea lion" ) is an extinct genus of large fur seal. ''Thalassoleon'' inhabited the Northern Pacific Ocean in latest Miocene and early Pliocene. Fossils of ''T. mexicanus'' are known from Baja California and southern California. ...''. References {{Taxonbar, from=Q4412222 Mammal genera Mammal genera with one living species Eared seals Taxa named by John Edward Gray Mammals described in 1859 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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