? Repenomamus
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Mammalia Infraclass: Triconodonta Family: Repenomamidae Li, Wang, Wang, Li, 2000 Genus: Repenomamus Li, Wang, Wang, Li, 2000
Species
Repenomamus robustus Li, Wang, Wang, Li, 2000 Repenomamus giganticus Hu, Meng, Wang, Li, 2005

Repenomamus is the largest mammal known from the Cretaceous period of the Mesozoic, and the only one with evidence that it ate dinosaurs. Image File history File links Download high resolution version (1024x768, 35 KB)Repenomamus i draw in Flash for wikipedia 7 september 2005 mateus zica File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms (as opposed to folk taxonomy). ... Phyla Subregnum Parazoa Porifera (sponges) Subregnum Agnotozoa Placozoa (trichoplax) Orthonectida (orthonectids) Rhombozoa (dicyemids) Subregnum Eumetazoa Radiata (unranked) (radial symmetry) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anemones) Bilateria (unranked) (bilateral symmetry) Acoelomorpha (basal) Orthonectida (parasitic to flatworms, echinoderms, etc. ... Typical Classes Subphylum Urochordata - Tunicates Ascidiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with... Orders Subclass Multituberculata (extinct) Plagiaulacida Cimolodonta Subclass Palaeoryctoides (extinct) Subclass Triconodonta (extinct) Subclass Eutheria (includes extinct ancestors)/Placentalia (excludes extinct ancestors) Afrosoricida Artiodactyla Carnivora Cetacea Chiroptera Cimolesta (extinct) Creodonta (extinct) Condylarthra (extinct) Dermoptera Desmostylia (extinct) Dinocerata (extinct) Embrithopoda (extinct) Hyracoidea Insectivora Lagomorpha Litopterna (extinct) Macroscelidea Mesonychia (extinct) Notoungulata (extinct) Perissodactyla... Triconodonta is the generic name for a group of mammals which were the ancestors of present-day mammals and which lived between the Triassic and the Cretaceous. ... This article is about the year 2000. ... This article is about the year 2000. ... In biology, a species is the basic unit of biodiversity. ... Orders Subclass Multituberculata (extinct) Plagiaulacida Cimolodonta Subclass Palaeoryctoides (extinct) Subclass Triconodonta (extinct) Subclass Eutheria (includes extinct ancestors)/Placentalia (excludes extinct ancestors) Afrosoricida Artiodactyla Carnivora Cetacea Chiroptera Cimolesta (extinct) Creodonta (extinct) Condylarthra (extinct) Dermoptera Desmostylia (extinct) Dinocerata (extinct) Embrithopoda (extinct) Hyracoidea Insectivora Lagomorpha Litopterna (extinct) Macroscelidea Mesonychia (extinct) Notoungulata (extinct) Perissodactyla... Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period, about 146 million years ago (Ma), to the beginning of the Paleocene epoch of the Tertiary period (65. ... The Mesozoic is one of three geologic eras of the Phanerozoic eon. ... Orders & Suborders Saurischia Sauropodomorpha Theropoda Ornithischia Thyreophora Ornithopoda Marginocephalia Dinosaurs were vertebrate animals that dominated the terrestrial ecosystem for over 160 million years, first appearing approximately 230 million years ago. ...

Animals of this genus were plantigrade, which is a foot posture not associated with running quickly after prey. Also, the legs were relatively short compared to the body. In many ways, their body shape may have resembled modern day Tasmanian devils. In biology, a genus (plural genera) is a taxonomic grouping. ... Human skeleton, showing plantigrade habit In mammals, plantigrade locomotion means walking with the podials and metatarsals flat on the ground. ... Binomial name Sarcophilus laniarius (Boitard, 1841) Synonyms Sarcophilius harrisii For other uses, see Tasmanian Devil (disambiguation). ...

They were probably carnivorous and, unlike other known Mesozoic mammals, probably ate young dinosaurs. A specimen of R. robustus has been discovered with a young Psittacosaurus preserved in its belly. The shape of Repenomamus teeth are also consistent with the hypothesis of carnivory. The lion is a well-known, truly carnivorous member of the order Carnivora. ... A parrot dinosaur who lived in Asia in the Late Cretaceous. ...

Size of a penisssss

The larger species, R. giganticus, holds the distinction of being the largest mammal known from the Cretaceous. A few other described mammals, such as an early giant platypus, Kollikodon, may have been larger, but they are only known from small fragments so their actual size is in question. R. giganticus was more than 1 m (3 ft) long and weighed about 12–14 kg (26–31 lb). The other species, R. robustus, was less than 0.5 m (20 in) long and weighed 4–6 kg (9–13 lb). In biology, a species is the basic unit of biodiversity. ... Binomial name Ornithorhynchus anatinus (Shaw, 1799) The Platypus (Ornithorhynchus anatinus) is a small, half-aquatic mammal endemic to the eastern part of Australia, and one of the three extant species of monotremes, the only mammals that lay eggs instead of giving birth to live young (the other two are echidnas). ... Kollikodon is an extinct species of Monotreme. ... Orders of magnitude (length) 1 E-13 m 1 E-12 m 1 E-11 m 1 E-10 m 1 E-9 m 1 E-8 m 1 E-7 m 1 E-6 m 1 E-5 m 1 E-4 m 1 E-3 m 1 E... A foot (plural: feet) is a non-SI unit of distance or length, measuring around a third of a meter. ... (Redirected from 1 E1 kg) Categories: Orders of magnitude (mass) ... The pound is the name of a number of units of mass, all in the range of 300 to 600 grams. ... To help compare different orders of magnitude this page lists lengths between 10-1 m and 1 m (10 cm and 1 m). ... Mid-19th century tool for converting between different standards of the inch An inch is an Imperial and U.S. customary unit of length. ... (Redirected from 1 E0 kg) Categories: Orders of magnitude (mass) ...

These finds are considered important, because they expand the ecological niches known to be inhabited by mammals during the 150 million year reign of the dinosaurs. Previously, the only known mammals of this time period were small nocturnal insectivores, not unlike modern day shrews. It had been assumed that the niches of animals larger than 1 m (3 ft) in length were filled entirely by dinosaurs, and were off limits to mammals until after the Cretaceous-Tertiary extinction event wiped out the dinosaurs and allowed the diversification of mammals during the Cenozoic. Repenomamus was an exception to this rule. In ecology, a niche is a term describing the relational position of a species or population in an ecosystem. ... Any organism with a diet that consists chiefly of insects and similar small creatures is an insectivore. ... Genera Anourosorex Blarina Blarinella Chimarrogale Chodsigoa Congosorex Crocidura Cryptotis Diplomosodon Episoriculus Feroculus Megasorex Myosorex Nectogale Neomys Nesiotites Notiosorex Paracrocidura Ruwenzorisorex Scutisorex Solisorex Sorex Soriculus Suncus Surdisorex Sylvisorex Shrews are small, superficially mouse-like mammals of the family Soricidae. ... Badlands near Drumheller, Alberta where erosion has exposed the KT boundary. ... The Cenozoic Era (sen-oh-ZOH-ik; sometimes Caenozoic Era in the United Kingdom) meaning new life (Greek kainos = new + zoe = life) is the most recent of the three classic geological eras. ...

The smallest dinosaurs are either early bipeds, or members of the lineage that evolved into the birds during the Jurassic period. R. giganticus is larger than a small handful of feathered dinosaurs also from the same rock formation in China, including Microraptor and Parvicursor, and is roughly the same size as the earlier Compsognathus. Repenomamus is also larger than numerous species of Jurassic and Cretaceous birds, which are also considered dinosaurs by cladists. A biped (//) meaning two feet (Latin bi = two + ped = foot) is an animal that travels across surfaces supported by two legs. ... The Jurassic period is a major unit of the geologic timescale that extends from about 200 Ma (million years ago) at the end of the Triassic to 146 Ma at the beginning of the Cretaceous. ... Sinornithosaurus by Jim Robins Feathered dinosaurs are regarded by many paleontologists as transitional fossils between birds and dinosaurs. ... Microraptor was a small, bird-like dinosaur related to the dromaeosaurs. ... Binomial name Parvicursor remotus Karhu & Rautian, 1996 Parvicursor remotus was a tiny Alvarezsaurian dinosaur, with long slender legs for fast running. ... Compsognathus (komp-sog-NAY-thus) lived in Late Jurassic of Germany, France and perhaps Portugal. ... Orders Many - see section below. ... Greek clados = branch) or phylogenetic systematics is a branch of biology that determines the evolutionary relationships of living things based on derived similarities. ...

Classification and discovery

The fossils were recovered from the lagerstätte of the Yixian Formation in the Liaoning province of China, which is renowned for its extraordinarily well-preserved fossils of feathered dinosaurs. They have been specifically dated to 128–139 million years ago, during the Early Cretaceous period. Lagerstätten (German, singular: Lagerstätte, literally: place(s) of storage or resting place(s)) are sedimentary deposits that exhibit extraordinary fossil richness or completeness. ... The Yixian Formation is a geological formation in Liaoning, Peoples Republic of China, that stems from the early Cretaceous period. ... Sinornithosaurus by Jim Robins Feathered dinosaurs are regarded by many paleontologists as transitional fossils between birds and dinosaurs. ... Mega-annum, usually abbreviated as Ma, is a unit of time equal to one million years. ...

Repenomamus is a genus of triconodonts, a group of early mammals with no modern relatives. R. robustus was described by Li, Wang, Wang and Li in 2000, and R. giganticus was described by Hu, Meng, Wang, Li 2005. The two known species are the sole members of the family Repenomamidae, which was also described in the same paper in 2000. In biology, a genus (plural genera) is a taxonomic grouping. ... Families Amphilestidae Eutriconodontidae Gobiconodontidae Repenomamidae Triconodonta is the generic name for a group of mammals which were the ancestors of present-day mammals and which lived between the Triassic and the Cretaceous. ... Orders Subclass Multituberculata (extinct) Plagiaulacida Cimolodonta Subclass Palaeoryctoides (extinct) Subclass Triconodonta (extinct) Subclass Eutheria (includes extinct ancestors)/Placentalia (excludes extinct ancestors) Afrosoricida Artiodactyla Carnivora Cetacea Chiroptera Cimolesta (extinct) Creodonta (extinct) Condylarthra (extinct) Dermoptera Desmostylia (extinct) Dinocerata (extinct) Embrithopoda (extinct) Hyracoidea Insectivora Lagomorpha Litopterna (extinct) Macroscelidea Mesonychia (extinct) Notoungulata (extinct) Perissodactyla... In biology, a species is the basic unit of biodiversity. ...

References

• J. Li, Y. Wang, Y. Wang, & C. Li. 2000. A new family of primitive mammal from the Mesozoic of western Liaoning, China. Chinese Science Bulletin 46(9): 782–785. (2001).(abstract, in English)

• Yaoming Hu, Jin Meng, Yuanqing Wang, Chuankui Li. 2005. Large Mesozoic mammals fed on young dinosaurs. Nature, 433: 149–152. (abstract)

External links

• "Prehistoric badger had dinosaurs for breakfast". Michael Hopkin. Nature.com. January 12, 2005.
• "Fierce mammal ate dinos for lunch". BBC News. January 12, 2005.