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Neohyaenodon
''Hyaenodon'' (" hyena-tooth") is an extinct genus of carnivorous hyaenodont mammals from tribe Hyaenodontini, within subfamily Hyaenodontinae in family Hyaenodontidae,Malcolm C. McKenna, Susan K. Bell (1997."Classification of Mammals: Above the Species Level" Columbia University Press, New York, 631 pages. that lived in Eurasia and North America during the middle Eocene to early Miocene, existing for about 25.1 million years. Description Typical of early carnivorous mammals, individuals of ''Hyaenodon'' had a very massive skull, but only a small brain. The skull is long with a narrow snout - much larger in relation to the length of the skull than in canine carnivores, for instance. The neck was shorter than the skull, while the body was long and robust and terminated in a long tail. Compared to the generally larger (but not closely related) ''Hyainailouros'', the dentition of ''Hyaenodon'' was geared more towards shearing meat and less towards bone crushing. Some specie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyaenodon And Leptomeryx
''Hyaenodon'' ("hyena-tooth") is an extinct genus of carnivorous hyaenodont mammals from tribe Hyaenodontini, within subfamily Hyaenodontinae in family Hyaenodontidae,Malcolm C. McKenna, Susan K. Bell (1997."Classification of Mammals: Above the Species Level" Columbia University Press, New York, 631 pages. that lived in Eurasia and North America during the middle Eocene to early Miocene, existing for about 25.1 million years. Description Typical of early carnivorous mammals, individuals of ''Hyaenodon'' had a very massive skull, but only a small brain. The skull is long with a narrow snout - much larger in relation to the length of the skull than in canine carnivores, for instance. The neck was shorter than the skull, while the body was long and robust and terminated in a long tail. Compared to the generally larger (but not closely related) ''Hyainailouros'', the dentition of ''Hyaenodon'' was geared more towards shearing meat and less towards bone crushing. Some species of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyaenodon Heinrich Harder
''Hyaenodon'' ("hyena-tooth") is an extinct genus of carnivorous hyaenodont mammals from tribe Hyaenodontini, within subfamily Hyaenodontinae in family Hyaenodontidae,Malcolm C. McKenna, Susan K. Bell (1997."Classification of Mammals: Above the Species Level" Columbia University Press, New York, 631 pages. that lived in Eurasia and North America during the middle Eocene to early Miocene, existing for about 25.1 million years. Description Typical of early carnivorous mammals, individuals of ''Hyaenodon'' had a very massive skull, but only a small brain. The skull is long with a narrow snout - much larger in relation to the length of the skull than in canine carnivores, for instance. The neck was shorter than the skull, while the body was long and robust and terminated in a long tail. Compared to the generally larger (but not closely related) ''Hyainailouros'', the dentition of ''Hyaenodon'' was geared more towards shearing meat and less towards bone crushing. Some species of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyaenodon NT Small
''Hyaenodon'' ("hyena-tooth") is an extinct genus of carnivorous hyaenodont mammals from tribe Hyaenodontini, within subfamily Hyaenodontinae in family Hyaenodontidae,Malcolm C. McKenna, Susan K. Bell (1997."Classification of Mammals: Above the Species Level" Columbia University Press, New York, 631 pages. that lived in Eurasia and North America during the middle Eocene to early Miocene, existing for about 25.1 million years. Description Typical of early carnivorous mammals, individuals of ''Hyaenodon'' had a very massive skull, but only a small brain. The skull is long with a narrow snout - much larger in relation to the length of the skull than in canine carnivores, for instance. The neck was shorter than the skull, while the body was long and robust and terminated in a long tail. Compared to the generally larger (but not closely related) ''Hyainailouros'', the dentition of ''Hyaenodon'' was geared more towards shearing meat and less towards bone crushing. Some species of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyaenodon Horridus Skull
''Hyaenodon'' ("hyena-tooth") is an extinct genus of carnivorous hyaenodont mammals from tribe Hyaenodontini, within subfamily Hyaenodontinae in family Hyaenodontidae,Malcolm C. McKenna, Susan K. Bell (1997."Classification of Mammals: Above the Species Level" Columbia University Press, New York, 631 pages. that lived in Eurasia and North America during the middle Eocene to early Miocene, existing for about 25.1 million years. Description Typical of early carnivorous mammals, individuals of ''Hyaenodon'' had a very massive skull, but only a small brain. The skull is long with a narrow snout - much larger in relation to the length of the skull than in canine carnivores, for instance. The neck was shorter than the skull, while the body was long and robust and terminated in a long tail. Compared to the generally larger (but not closely related) ''Hyainailouros'', the dentition of ''Hyaenodon'' was geared more towards shearing meat and less towards bone crushing. Some species of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyaenodontidae
Hyaenodontidae ("hyena teeth") is a family of extinct predatory mammals from extinct superfamily Hyaenodontoidea within extinct order Hyaenodonta. Hyaenodontids arose during the early Eocene and persisted well into the early Miocene. Fossils of this group have been found in Asia, North America and Europe. (1985): ''The Field Guide to Prehistoric Life.'' Facts on File Publications, New York. Classification and phylogeny Taxonomy * Family: †Hyaenodontidae ** Genus: †'' Boritia'' *** †''Boritia duffaudi'' ** Genus: †'' Neosinopa'' *** †''Neosinopa gobiensis'' ** Genus: †'' Praecodens'' *** †''Praecodens acutus'' ** Genus: †'' Preregidens'' *** †''Preregidens langebadrae'' ** Genus: †'' Protoproviverra'' *** †''Protoproviverra palaeonictides'' ** (unranked): †''Cynohyaenodon''/''Quercytherium'' clade *** Genus: †''Cynohyaenodon'' (paraphyletic genus) **** †''Cynohyaenodon cayluxi'' **** †''Cynohyaenodon lautricensis'' **** †''Cynohyaenodo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyaenodontinae
Hyaenodontinae ("hyena teeth") is a subfamily of extinct predatory hyaenodontid mammals from extinct family Hyaenodontidae. Fossil remains of these mammals are known from early Eocene to early Miocene deposits in Europe, Asia and North America. Classification and phylogeny Taxonomy * Subfamily: †Hyaenodontinae ** Genus: †'' Consobrinus'' *** †''Consobrinus quercy'' ** Genus: †'' Propterodon'' (paraphyletic genus) *** †''Propterodon morrisi'' *** †''Propterodon paganensis'' *** †''Propterodon tongi'' *** †''Propterodon witteri'' ** Tribe: † Epipterodontini *** Genus: †'' Epipterodon'' **** †''Epipterodon hyaenoides'' *** Genus: †'' Immanopterodon'' **** †''Immanopterodon acutidens'' **** †''Immanopterodon implacidus'' ** Tribe: †Hyaenodontini *** Genus: †''Hyaenodon'' **** †''Hyaenodon brachyrhynchus'' **** †''Hyaenodon chunkhtensis'' **** †''Hyaenodon dubius'' **** †''Hyaenodon eminus'' **** †''Hyaenodon exiguus'' **** ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brontothere
Brontotheriidae is a family of extinct mammals belonging to the order Perissodactyla, the order that includes horses, rhinoceroses, and tapirs. Superficially, they looked rather like rhinos, although they were actually more closely related to horses; Equidae and Brontotheriidae make up the suborder Hippomorpha. They lived around 56–34 million years ago, until the very close of the Eocene. Characteristics and evolution Brontotheres retain four toes on their front feet and three toes on their hind feet. Their teeth are adapted to shearing (cutting) relatively nonabrasive vegetation. Their molars have a characteristic W-shaped ectoloph (outer shearing blade). The evolutionary history of this group is well known due to an excellent fossil record in North America. The earliest brontotheres, such as ''Eotitanops'', were rather small, no more than a meter in height, and hornless. Brontotheres evolved massive bodies, although some small species such as ''Nanotitanops'' did pers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesohippus
''Mesohippus'' (Greek: / meaning "middle" and / meaning "horse") is an extinct genus of early horse. It lived 37 to 32 million years ago in the Early Oligocene. Like many fossil horses, ''Mesohippus'' was common in North America. Its shoulder height is estimated about 60 cm tall. Description ''Mesohippus'' had longer legs than its predecessor ''Eohippus'' and stood about 60 cm (6 hands) tall. This equid is the first fully tridactyl horse in the evolutionary record, with the third digit being longer and larger than its second and fourth digits; ''Mesohippus'' had not developed a hoof at this point, rather it still had pads as seen in ''Hyracotherium'' and ''Orohippus''.MacFadden, B. J.. 1992. Fossil Horses: Systematics, Paleobiology, and Evolution of the Family Equidae. Cambridge University Press, Cambridge. The face of ''Mesohippus'' was longer and larger than earlier equids. It had a slight facial fossa, or depression, in the skull. The eyes were rounder, and were set wid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyainailurus
''Hyainailouros'' ("hyena-cat") is an extinct polyphyletic genus of hyainailourid hyaenodont mammal of the polyphyletic tribe Hyainailourini within paraphyletic subfamily Hyainailourinae, that lived during the early to middle Miocene, of which there were at least three species spread across Europe, Africa, and Asia. Closely related to other large African hyaenodonts such as ''Simbakubwa'' and ''Megistotherium'', ''Hyainailouros'' walked with a semi-digitigrade stance and was probably capable of large, leaping bounds. Alongside its African relatives and the last members of the genus ''Hyaenodon ''Hyaenodon'' (" hyena-tooth") is an extinct genus of carnivorous hyaenodont mammals from tribe Hyaenodontini, within subfamily Hyaenodontinae in family Hyaenodontidae,Malcolm C. McKenna, Susan K. Bell (1997."Classification of Mammals: Above t ...'' from Asia, ''Hyainailouros'' was among the largest hyaenodonts that existed. Phylogeny The phylogenetic relationships of genus ''Hyai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nimravidae
Nimravidae is an extinct family (biology), family of carnivorans, sometimes known as false saber-toothed cats, whose fossils are found in North America and Eurasia. Not considered to belong to the true cats (family Felidae), the nimravids are generally considered closely related and classified as a distinct family in the suborder Feliformia. Fossils have been dated from the Middle Eocene through the Late Miocene epochs (Bartonian through Tortonian stages, 40.4–7.2 million years ago), spanning about . The barbourofelids, which were formerly classified as a subfamily of the Nimravidae, were reassigned to their own distinct family Barbourofelidae in 2004. However, some recent studies suggest the barbourofelids are a branch of the nimravids, suggesting that this debate might not be settled yet. Morphology and evolution Most nimravids had muscular, low-slung, cat-like bodies, with shorter legs and tails than are typical of cats. Unlike extant taxon, extant Feliformia, the nimravids ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dissopsalis
''Dissopsalis'' ("double scissors") is a genus of teratodontine hyaenodonts of the tribe Dissopsalini. The older species, ''D. pyroclasticus'', lived in Kenya during the middle Miocene, while the type species, ''D. carnifex'', lived in Pakistan and India during the middle to late Miocene.Barry, J. C. (1988.) "''Dissopsalis'', a middle and late Miocene proviverrine creodont (Mammalia) from Pakistan and Kenya." ''Journal of Vertebrate Paleontology'' 48(1): 25–45 ''Dissopsalis'' is the last known hyaenodont genus. It lived alongside its relative ''Hyaenodon weilini'', a member of the very successful genus ''Hyaenodon'', during the Miocene in China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and .... ''Dissopsalis'' survived to the end of the Miocene, whereas ''H. weilini'' did not ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
