|
Dryolestida
Dryolestida is an extinct order of mammals, known from the Jurassic and Cretaceous. They are considered basal members of the clade Cladotheria, close to the ancestry of therian mammals. It is also believed that they developed a fully mammalian jaw and also had the three middle ear bones. Most members of the group, as with most Mesozoic mammals, are only known from fragmentary tooth and jaw remains. The group contains Dryolestidae and the possibly paraphyletic Paurodontidae, and some other unplaced genera, which were small insectivores, known from the Middle Jurassic to Early Cretaceous of Laurasia, primarily Europe and North America, with a single record from Asia. During the Late Jurassic in North America and from the Late Jurassic to Early Cretaceous in Europe, they were among the most diverse mammal groups. They have sometimes been placed as part of a broader group, the "Dryolestoidea", which typically includes Dryolestida and Meridiolestida, a diverse group of mammals in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dryolestidae
Dryolestidae is an extinct family of Mesozoic mammals, known from the Middle Jurassic to the Early Cretaceous of the North Hemisphere. The oldest known member, '' Anthracolestes'', is known from the Middle Jurassic Itat Formation of Western Siberia, but most other representatives are known from the Late Jurassic of North America and the Late Jurassic and Early Cretaceous of Europe. Most members are only known from isolated teeth and jaw fragments. Like many other groups of early mammals, they are thought to have been insectivores. They are generally classified in Cladotheria, meaning that they are considered to be more closely related to marsupials and placentals than to monotremes. They are placed as part of the broader Dryolestida, which also includes the (possibly paraphyletic) Paurodontidae, and also sometimes the South American-Antarctic Meridiolestida, which are often considered unrelated cladotherians. Dryolestidae taxon is not based on a phylogenetic definition, but instea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henkelotherium
''Henkelotherium'' is an extinct genus of dryolestidan mammal from the Late Jurassic (Kimmeridgian) Camadas de Guimarota, in Portugal. Unlike many other Jurassic mammals, it is known from a largely complete skeleton, and is thought to have had an arboreal lifestyle. Description The skull of ''Henkelotherium'' is long, and presacral body length is . This suggest a weight of about . Paleobiology Primitive characters of ''Henkelotherium'' (e.g. asymmetric condyles of the femur) indicate that this species had a mode of locomotion similar to tree shrews and opossums. The small size of ''Henkelotherium'' and elongated tail made it suited to an arboreal lifestyle and capable of climbing trees, a notion supported by the paleoecological reconstruction of the Guimarota ecosystem indicating a densely vegetated environment. Based on its late growth of jaws and it possessing additional molars that erupted after antemolar replacement was completed, ''Henkelotherium'' is believed to have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cladotheria
Cladotheria is a clade (sometimes ranked as a legion) of mammals. It contains modern therian mammals (marsupials and placentals) and several extinct groups, such as the "dryolestoids", amphitheriids and peramurids. The clade was named in 1975 by Malcolm McKenna. In 2002, it was defined as a node-based taxon containing "the common ancestor of dryolestids and living therians, plus all its descendants". A different, stem-based definition was given in 2013, in which Cladotheria contains all taxa that are closer to ''Mus musculus'' (the house mouse) than to the " symmetrodont" '' Spalacotherium tricuspidens''. Cladotheria incorporates a set of nested mammal clades culminating in Tribosphenida (also known as Boreosphenida), mammals with fully tribosphenic teeth such as therians and a few of their closest relatives. The clade Prototribosphenida includes "the common ancestor of '' Vincelestes'' and living therians, plus all of its descendants". Apart from tribosphenids, Prototrib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eupantotheria
Pantotheria is an abandoned taxon of Mesozoic mammals. This group is now considered an informal "wastebasket" taxon and has been replaced by Dryolestida as well as other groups. It is sometimes treated as an infraclass and older books refer to it as being related to symmetrodonts. One classification makes it an infraclass with a single order, Eupantotheria. Taxonomy List of mammals that were at one time included in the group PantotheriaMikko's Phylogeny Archiv *Genus †'' Tribactonodon, Tribactonodon bonfieldi'' Sigogneau-Russell, Hooker & Ensom 2001 *Genus †'' Paraungulatum rectangularis'' Bonaparte 1999 *Genus †'' Argaliatherium robustum '' Cifelli & Davis 2015 *Genus †'' Carinalestes murensis'' Cifelli & Davis 2015 *Genus †'' Hypomylos'' Sigogneau-Russell 1992 *Family † Picopsidae Fox 1980 **Genus †'' Picopsis pattersoni'' Fox 1980 **Genus †'' Tirotherium aptum'' Montellano-Ballesteros & Fox 2015 *Family † Casamiqueliidae Bonaparte 1999 **Genus †'' Casam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meridiolestida
Meridiolestida is an extinct clade of mammals known from the Cretaceous and Cenozoic of South America and possibly Antarctica. They represented the dominant group of mammals in South America during the Late Cretaceous. Meridiolestidans were morphologically diverse, containing both small insectivores such as the "sabretooth-squirrel" ''Cronopio (mammal), Cronopio,supplementary information '' as well as the clade Mesungulatoidea/Mesungulatomorpha, which ranged in size from the shrew-sized ''Reigitherium'' to the dog-sized ''Peligrotherium.'' Mesungulatoideans had highly modified dentition with bunodont (low and rounded) teeth, and were likely herbivores/omnivores. Meridiolestidans are generally classified within Cladotheria, more c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paurodontidae
Paurodontidae is a family of Late Jurassic to Early Cretaceous mammals in the order Dryolestida. Remains of paurodontids have been found in the United States, Britain, Portugal, and Tanzania. The group likely represents a paraphyletic group of basal non dryolestid dryolestidans. ''Paurodon'' has been suggested to have been a specilast feeder on earthworms due to the morphology of its teeth closely resembling that of the golden mole genus ''Amblysomus ''Amblysomus'' (also narrow-headed golden mole or South African golden mole) is a genus of the golden mole family, Chrysochloridae, comprising five species of the small, insect-eating, burrowing mammals endemic to Southern Africa. All five spec ...''.A.O. Averianov and T. Martin (2015). "Ontogeny and taxonomy of Paurodon valens (Mammalia, Cladotheria) from the Upper Jurassic Morrison Formation of USA" (PDF). Proceedings of the Zoological Institute of the Russian Academy of Sciences 319 (3): 326–340. References Dryolestida ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anthracolestes
''Anthracolestes'' is an extinct genus of dryolestid that lived during the Bathonian stage of the Middle Jurassic epoch. Distribution ''Anthracolestes sergeii'' is known from the Itat Formation of Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders .... References {{Taxonbar, from=Q133804202 Monotypic prehistoric mammal genera Fossils of Russia Fossil taxa described in 2014 Dryolestida ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drescheratherium
''Drescheratherium'' is an extinct genus of mammal from the Late Jurassic (Kimmeridgian) Camadas de Guimarota of Leiria, Portugal. It is represented by fairly complete upper jaws with teeth. It bears elongated upper canines, though not to the extent another dryolestoid, '' Cronopio'', does. Supplementary information See also * Prehistoric mammal ** List of prehistoric mammals This is an incomplete list of prehistoric mammals. It does not include List of mammals, extant mammals or List of extinct mammals, recently extinct mammals. For extinct primate species, see: list of fossil primates.Mikko's Phylogeny Archiv Ma ... References Dryolestida Late Jurassic mammals of Europe Jurassic Portugal Fossils of Portugal Fossil taxa described in 1998 Prehistoric mammal genera {{jurassic-mammal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paurodon
''Paurodon'' is an extinct genus of Late Jurassic mammal from the Morrison Formation of the Western United States. Taxonomy ''Paurodon'' is the type genus of the dryolestidan group Paurodontidae. ''Araeodon'', ''Archaeotrigon'', ''Foxraptor'', and ''Pelicopsis'' are apparently growth stages of ''Paurodon''. Distribution and stratigraphy Remains of ''Paurodon'' have been found in stratigraphic zone 5 of the Morrison Formation in Como Bluff, Wyoming.Foster, J. (2007). "Appendix." ''Jurassic West: The Dinosaurs of the Morrison Formation and Their World''. Indiana University Press. pp. 327-329. Biology ''Paurodon'' was strongly convergent with modern golden moles in terms of dentition and jaw shape. This suggests that its diet was composed of earthworms (unlike other contemporary dryolestoids, which were more insectivorous)Ontogeny and taxonomy of Paurodon valens (Mammalia, Cladotheria) from the Upper Jurassic Morrison Formation of USA. (pdf), Proceedings of the Zoological Institute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euthlastus
''Euthlastus'' is an extinct genus of Late Jurassic (Kimmeridgian - Tithonian) mammal from the Morrison Formation. Present in stratigraphic zones 5 and 6.Foster, J. (2007). "Appendix." ''Jurassic West: The Dinosaurs of the Morrison Formation and Their World''. Indiana University Press. pp. 327-329. It is represented by only five upper molars.G. G. Simpson. 1927. Mesozoic Mammalia. VI. Genera of Morrison pantotheres. American Journal of Science 13:409-416. See also * Prehistoric mammal ** List of prehistoric mammals * Paleobiota of the Morrison Formation The Morrison Formation is a distinctive sequence of Late Jurassic sedimentary rock that is found in the western United States, which has a wide assortment of Taxon, taxa represented in its fossil record, including dinosaur fossils in North America ... References * Foster, J. (2007). Jurassic West: The Dinosaurs of the Morrison Formation and Their World. Indiana University Press. 389pp. Dryolestida Morrison mammals F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
