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Machaeroides
''Machaeroides'' ("dagger-like") is a genus of sabre-toothed predatory mammal that lived during the Eocene (54.9 to 46.2 mya). Its fossils were found in the U.S. state of Wyoming. Description Both species bore a passing or superficial resemblance to a very small, dog-sized saber-toothed cat. ''Machaeroides'' could be distinguished from actual saber-toothed cats by their more-elongated skulls, and their plantigrade stance. ''Machaeroides'' species are distinguished from the closely related '' Apataelurus'' by the fact that the former genus had smaller saber-teeth. Despite its small size, the genus ''Machairoides'' was well-equipped to hunt prey larger than itself, such as the small, primitive horses and rhinoceroses present at the time, as it was equipped with saber teeth and powerful forelimbs to subdue prey. ''M. eothen'' weighed an estimated , thus matching in size a small Staffordshire Terrier. ''M. simpsoni'' was probably smaller. Taxonomic placement Its position within the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Machaeroidinae Sp
Machaeroidinae ("dagger-like") is a subfamily of extinct carnivorous sabre-toothed placental mammals from Asia and North America.Malcolm C. McKenna, Susan K. Bell: ''Classification of Mammals: Above the Species Level'' in Columbia University Press, New York (1997), 631 Seiten. Traditionally classified as hyaenodonts, this group is now classified as a member of the family Oxyaenidae. Classification and phylogeny Taxonomy * Subfamily: †Machaeroidinae (Matthew, 1909) ** Genus: †'' Apataelurus'' (Scott, 1937) *** †''Apataelurus kayi'' (Scott, 1937) *** †''Apataelurus pishigouensis'' (Tong & Lei, 1986) ** Genus: †''Diegoaelurus'' (Zack, Poust & Wagner, 2022) *** ''Diegoaelurus vanvalkenburghae'' (Zack, Poust & Wagner, 2022) ** Genus: †'' Isphanatherium'' (Lavrov & Averianov, 1998) *** ''Isphanatherium ferganensis'' (Lavrov & Averianov, 1998) ** Genus: †''Machaeroides'' (Matthew, 1909) *** †''Machaeroides eothen'' (Matthew, 1909) *** †''Machaeroides simpsoni'' (Daws ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Machaeroidinae
Machaeroidinae ("dagger-like") is a Family (biology), subfamily of extinct carnivorous Saber-toothed cat, sabre-toothed Placentalia, placental mammals from Asia and North America.Malcolm C. McKenna, Susan K. Bell: ''Classification of Mammals: Above the Species Level'' in Columbia University Press, New York (1997), 631 Seiten. Traditionally classified as Hyaenodonta, hyaenodonts, this group is now classified as a member of the family Oxyaenidae. Classification and phylogeny Taxonomy * Subfamily: †Machaeroidinae (Matthew, 1909) ** Genus: †''Apataelurus'' (Scott, 1937) *** †''Apataelurus kayi'' (Scott, 1937) *** †''Apataelurus pishigouensis'' (Tong & Lei, 1986) ** Genus: †''Diegoaelurus'' (Zack, Poust & Wagner, 2022) *** ''Diegoaelurus vanvalkenburghae'' (Zack, Poust & Wagner, 2022) ** Genus: †''Isphanatherium'' (Lavrov & Averianov, 1998) *** ''Isphanatherium ferganensis'' (Lavrov & Averianov, 1998) ** Genus: †''Machaeroides'' (Matthew, 1909) *** †''Machaeroides eot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxyaenidae
Oxyaenidae ("sharp hyenas") is a family of extinct carnivorous placental mammals. Traditionally classified in order Creodonta, this group is now classified in its own order Oxyaenodonta ("sharp tooth hyenas") within clade Pan-Carnivora in mirorder Ferae. The group contains four subfamilies comprising fourteen genera. Oxyaenids were the first to appear during the late Paleocene in North America, while smaller radiations of oxyaenids in Europe and Asia occurred during the Eocene. Etymology The name of order Oxyaenodonta comes , name of hyena genus ''Hyaena'' and . The name of family Oxyaenidae comes , name of hyena genus ''Hyaena'' and taxonomic suffix ":wikt:-idae#Suffix, -idae". Description They were superficially cat-like mammals that plantigrade, walked on flat feet, in contrast to modern cats, which digitigrade, walk and run on their toes. Anatomically, characteristic features include a short, broad skull, deep jaws, and teeth designed for crushing rather than shearing, as in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diegoaelurus
''Diegoaelurus'' ("San Diego's cat") is a Extinction, extinct genus of mammals from the extinct subfamily Machaeroidinae within extinct family Oxyaenidae. This genus currently contains only one species ''Diegoaelurus vanvalkenburghae'', found in the Santiago Formation, California, Santiago Formation in California. This mammal lived during the Uintan stage of the Eocene, Middle Eocene Epoch around 46.2 to 39.7 million years ago. Etymology The name of genus ''Diegoaelurus'' comes from city San Diego and . ''Diegoaelurus vanvalkenburghae'' was named after Dr. Blaire Van Valkenburgh in honor of her research on carnivorous mammals and saber-toothed predator paleoecology. Description ''Diegoaelurus vanvalkenburghae'' was small in stature, with a size comparable to a Fossa (animal), fossa. The holotype fossils (SDSNH 38343) consists of a mandible and well preserved dentition. Its discovery has made paleontologists question whether this group's extinction was caused due to the Eocene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saber-toothed Cat
Machairodontinae is an extinct subfamily of carnivoran mammals of the family Felidae (true cats). They were found in Asia, Africa, North America, South America, and Europe from the Miocene to the Pleistocene, living from about 16 million until about 11,000 years ago. The Machairodontinae contain many of the extinct predators commonly known as "saber-toothed cats", including the famed genus ''Smilodon'', as well as other cats with only minor increases in the size and length of their maxillary canines. The name means "dagger-tooth", from Greek μάχαιρα (''machaira''), sword. Sometimes, other carnivorous mammals with elongated teeth are also called saber-toothed cats, although they do not belong to the felids. Besides the machairodonts, other saber-toothed predators also arose in the nimravids, barbourofelids, machaeroidines, hyaenodonts and even in two groups of metatherians (the thylacosmilid sparassodonts and the deltatheroideans). Evolution Family Felidae The Mach ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', "dawn") and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope Carbon-13, 13C in the atmosphere was exceptionally low in comparison with the more common isotope Carbon-12, 12C. The end is set at a major extinction event called the ''Grande Coupure'' (the "Great Break" in continuity) or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Popigai impact structure, Siberia and in what is now ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxyaeninae
Oxyaeninae ("sharp hyenas") is a extinct subfamily of oxyaenids from the late Paleocene to late Eocene of Asia, Europe and North America.Malcolm C. McKenna, Susan K. Bell: ''Classification of Mammals: Above the Species Level'' in Columbia University Press, New York (1997), 631 Seiten. Etymology The name of the subfamily translates as "sharp hyaenas" (, name of hyena genus '' Hyaena'' and taxonomic suffix " -inae"). Classification and phylogeny Taxonomy * Subfamily: †Oxyaeninae (Cope, 1877) ** Genus: †'' Argillotherium'' (Davies, 1884) *** †''Argillotherium toliapicum'' (Davies, 1884) ** Genus: †'' Dipsalidictis'' (Matthew & Granger, 1915) paraphyletic.html" ;"title="'paraphyletic">'paraphyletic genus''*** †''Dipsalidictis aequidens'' (Matthew & Granger, 1915) *** †''Dipsalidictis krausei'' (Gunnell & Gingerich, 1991) *** †''Dipsalidictis platypus'' (Matthew & Granger, 1915) *** †''Dipsalidictis transiens'' (Matthew & Granger, 1915) ** Genus: †''Malfelis' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene Genus First Appearances
The Eocene ( ) Epoch is a geological epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', "dawn") and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13C in the atmosphere was exceptionally low in comparison with the more common isotope 12C. The end is set at a major extinction event called the ''Grande Coupure'' (the "Great Break" in continuity) or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Siberia and in what is now Chesapeake Bay. As with other geologic periods, the strata that define the start and end of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleogene Geology Of Wyoming
The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (annum, Mya) to the beginning of the Neogene Period Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon. The earlier term Tertiary Period was used to define the span of time now covered by the Paleogene Period and subsequent Neogene Period; despite no longer being recognised as a formal stratigraphy, stratigraphic term, 'Tertiary' is still widely found in earth science literature and remains in informal use. Paleogene is often abbreviated "Pg" (but the United States Geological Survey uses the abbreviation PE for the Paleogene on the Survey's geologic maps). During the Paleogene, evolution of mammals, mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Placental Genera
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilisation, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iron Age. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene Mammals Of North America
The Eocene ( ) Epoch is a geological epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', "dawn") and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13C in the atmosphere was exceptionally low in comparison with the more common isotope 12C. The end is set at a major extinction event called the ''Grande Coupure'' (the "Great Break" in continuity) or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Siberia and in what is now Chesapeake Bay. As with other geologic periods, the strata that define the start and end of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
