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Asioryctitheria
Asioryctitheria ("Asian digging beasts") is an extinct order of early eutherians. Skull structure With the exception of '' Prokennalestes'', these advanced forms lacked a Meckelian groove. Furthermore, they were equipped with double-rooted canines, a lower premolar with a reduced or absent metaconid and a more elongated lower premolar than their predecessors. In addition, the entoconid and hypoconulid on the lower molars are untwinned, the entotympanic is non-existent, the alisphenoid is enlarged, a Vidian foramen is present as well as a promontorium linked to the paroccipital process via the crista interfenestralis. Classification Asioryctitheria contains at least four genera and two families.Mikko's Phylogeny ArchivPaleofile.com (net, info) . * '' Sasayamamylos kawaii'' Kusuhashi et al. 2013 * Kennalestidae ''Kennalestes'' is an extinct genus of insectivorous mammal resembling a shrew that was described in 1968.Z. Kielan-Jaworowska. 1968. New Upper Cretaceous multi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ukhaatherium
''Ukhaatherium'' is a now extinct species of mammal that lived during the upper Cretaceous about 84 to 72 million years ago in today's East Asia. It is known above all from the fossil locality Ukhaa Tolgod, Mongolia. An adult ''Ukhaatherium'' has an estimated weight of about 32g and bears several similarities to lipotyphlan insectivorans such as the tenrec. Characteristics ''Ukhaatherium'' ''nessovi'', the type and only species for the genus, is known from multiple near-complete specimens. The most notable feature of the species is the presence of epipubic bones in the pelvic girdle, which have been lost in extant eutherian mammals. The loss of epipubic bones is associated with the evolution of prolonged gestation in eutherian mammalian reproduction. This means that ''Ukhaatherium'' may have had a short gestation period resulting in the birth of altricial young, like monotremes, marsupials, and extinct Mesozoic mammals such as multituberculates. This supports the hypothesis th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mammalia
Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or hair, and three middle ear bones. These characteristics distinguish them from reptiles (including birds) from which they diverged in the Carboniferous, over 300 million years ago. Around 6,400 extant species of mammals have been described divided into 29 orders. The largest orders, in terms of number of species, are the rodents, bats, and Eulipotyphla (hedgehogs, moles, shrews, and others). The next three are the Primates (including humans, apes, monkeys, and others), the Artiodactyla ( cetaceans and even-toed ungulates), and the Carnivora (cats, dogs, seals, and others). In terms of cladistics, which reflects evolutionary history, mammals are the only living members of the Synapsida (synapsids); this clade, together w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eutheria
Eutheria (; from Greek , 'good, right' and , 'beast'; ) is the clade consisting of all therian mammals that are more closely related to placentals than to marsupials. Eutherians are distinguished from noneutherians by various phenotypic traits of the feet, ankles, jaws and teeth. All extant eutherians lack epipubic bones, which are present in all other living mammals (marsupials and monotremes). This allows for expansion of the abdomen during pregnancy. The oldest-known eutherian species is '' Juramaia sinensis'', dated at from the early Late Jurassic ( Oxfordian) of China. Eutheria was named in 1872 by Theodore Gill; in 1880 Thomas Henry Huxley defined it to encompass a more broadly defined group than Placentalia. Characteristics Distinguishing features are: *an enlarged malleolus ("little hammer") at the bottom of the tibia, the larger of the two shin bones *the joint between the first metatarsal bone and the entocuneiform bone (the innermost of the three cuneiform ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eutheria
Eutheria (; from Greek , 'good, right' and , 'beast'; ) is the clade consisting of all therian mammals that are more closely related to placentals than to marsupials. Eutherians are distinguished from noneutherians by various phenotypic traits of the feet, ankles, jaws and teeth. All extant eutherians lack epipubic bones, which are present in all other living mammals (marsupials and monotremes). This allows for expansion of the abdomen during pregnancy. The oldest-known eutherian species is '' Juramaia sinensis'', dated at from the early Late Jurassic ( Oxfordian) of China. Eutheria was named in 1872 by Theodore Gill; in 1880 Thomas Henry Huxley defined it to encompass a more broadly defined group than Placentalia. Characteristics Distinguishing features are: *an enlarged malleolus ("little hammer") at the bottom of the tibia, the larger of the two shin bones *the joint between the first metatarsal bone and the entocuneiform bone (the innermost of the three cuneiform ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albian
The Albian is both an age of the geologic timescale and a stage in the stratigraphic column. It is the youngest or uppermost subdivision of the Early/Lower Cretaceous Epoch/Series. Its approximate time range is 113.0 ± 1.0 Ma to 100.5 ± 0.9 Ma (million years ago). The Albian is preceded by the Aptian and followed by the Cenomanian. Stratigraphic definitions The Albian Stage was first proposed in 1842 by Alcide d'Orbigny. It was named after Alba, the Latin name for River Aube in France. A Global Boundary Stratotype Section and Point (GSSP), ratified by the IUGS in 2016, defines the base of the Albian as the first occurrence of the planktonic foraminiferan '' Microhedbergella renilaevis'' at the Col de Pré-Guittard section, Arnayon, Drôme, France. The top of the Albian Stage (the base of the Cenomanian Stage and Upper Cretaceous Series) is defined as the place where the foram species '' Rotalipora globotruncanoides'' first appears in the stratigraphic column. The Albia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crista Interfenestralis
The crista interfenestralis is an anatomical feature found in the inner ear of many reptiles. It is a bone ridge that divides the inner ear into two parts, the anterior and the posterior. The anterior part contains the fenestra ovalis and seems to be analogous to the vestibular duct, whereas the posterior part is analogous to the recess for the tympanic duct The tympanic duct or scala tympani is one of the perilymph-filled cavities in the inner ear of humans. It is separated from the cochlear duct by the basilar membrane, and it extends from the round window to the helicotrema, where it continues as .... References Ear Reptile anatomy {{Vertebrate anatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kennalestidae
''Kennalestes'' is an extinct genus of insectivorous mammal resembling a shrew that was described in 1968.Z. Kielan-Jaworowska. 1968. New Upper Cretaceous multituberculate genera from Bayn Dzak, Gobi Desert. ''Palaeontologia Polonica'' The type species is ''K. gobiensis'' and it was a common mammal in Mongolia during the Cretaceous period, found in both the Bayan Mandahu Formation and Djadochta Formation. It was found in Mongolia during the Campanian, so it might've fallen victim to such predators as ''Velociraptor'', ''Oviraptor'' and ''Archaeornithoides ''Archaeornithoides'' is a genus of maniraptoran theropod dinosaur of the Late Cretaceous of Mongolia. Discovery and naming In 1965, a Polish-Mongolian paleontological expedition found a fossil of a small dinosaur at Bayn Dzak, Mongolia. In 19 ...''. References Extinct animals of Asia Leptictids Cretaceous mammals Fossil taxa described in 1968 Prehistoric mammal genera {{cretaceous-mammal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Eutherians
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] |
Vidian Foramen
Guido Guidi (Latinized name Vidus Vidius) (10 February 1509 – 26 May 1569), was an Italian surgeon, anatomist and translator. Biography His father was a physician and his mother was the daughter of the painter Domenico Ghirlandajo. After practicing at Florence and Rome, he was invited by Francis I of France to come to Paris to be his personal doctor and teach at the Collège de France. While in Paris, Guido Guidi befriended artist Benvenuto Cellini and published a book on surgery, ''Chirurgia'', in 1544. This book was one of the best illustrated at the time and was based on works of Hippocrates, Galen, and Oribasius. In 1547, Guidi returned to Italy to become the personal physician of Cosimo di Medici and taught at Pisa. He took holy orders and was ennobled. A book on medicine, incomplete at his death in 1569, was finished by his nephew as ''Ars Medicinalis'' between 1596 and 1611. Today, the Vidian nerve in the skull and the Vidian artery are named after him. Wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
_2.jpg "Click for more on -> Vidian Foramen")