Under synapsids progress in class, lived during the late Permian and Triassic. China and South Africa is such a famous fossil origin. Their temporal hole is enlarged, the progressive beast bore holes temporal classes are not composed of the orbital rim bone and bone scales, but consists of the parietal bone, bone and Fang Fang yoke bone is reduced. Dentary increases accordingly, typically differentiated teeth, incisors, canines and cheek teeth of the other. The late Permian, the original purpose of the beast holes of two representatives Phthinosuchus gradually evolved teeth appeared different beast (Anomodonts) and animal rodents (Theriodonts).
Translated by Google
Feature
Beast hole mesh was previously known as mammal-like reptiles, are under synapsids in a mesh. Traditionally, the animal is classified in a single bow reptiles. However, when being used on genetics, this category typically includes mammals, mammals are descendants of animals hole mesh canine mammals. Beast hole mesh is very close mammals. The temporal Ru hole edge is not composed of the orbital bone and bone scales, but consists of the parietal bone, bone and Fang Fang yoke bone is reduced. Around the front eyelet frontal, orbital bone has disappeared. Dentary increases accordingly. Between the upper and lower jaws of reptiles in addition to the original style square bone - joint bone joints than other auxiliary appeared joints. Typically, the differentiation of teeth, there is not incisors, canines and cheek teeth of. Limbs appeared back elbow, knee forward and downward mammalian limb posture. Phalanges become 2-3-3-3-3. But the brains of these animals is still small, but also more primitive skull.
Translated by Google
Evolution
兽孔目 演化史
Beast hole mesh trajectories originated in the early evolution of the Permian, when a group of dragon heads wedge tooth Long Branch, evolved Dimetrodon lineage, evolved beast hole mesh. The evidence is on their anatomical features, such as the skull and spine. Beast hole mesh in the Permian replace dragon head became the dominant land animals. The purpose of temporal Ru beast bore hole than the big dragon purpose. Beast hole mesh may evolve heat regulation (warm-blooded) or late in the Permian. Beast hole mesh may have skin glands, rather than the mammal-like reptile scales. Early animal hole mesh no fur; Late Permian evolved beast rodents may be the only known animals have fur hole mesh. Beast hole mesh consists of three major clade composed of fear head beast suborder, herbivorous suborder of missing teeth, and the teeth are mostly carnivorous beast class, beginning giant carnivorous suborder is primitive species paraphyletic collection. After a brief burst of evolutionary diversity explosion, head of the beast suborder fear in the Permian (Guarda deer white bands) late disappear, but missing teeth suborder dicynodonts and animal teeth like Li tooth beast and the beast first class prospered, the first batch of Permian cynodonts there. Like all land animals, animal hole mesh is the Permian - Triassic extinction event severely affected, prosperous Korea tooth destruction of all mammals, only a few varieties ㄧ two subjects survived, survived into the Triassic each. Suborder missing teeth in a large heavy Branch Ken's herbivorous animals, canines and medium-sized mammals (including herbivorous and carnivorous) continued to flourish in the world of early and mid-Triassic. They gradually disappeared from the Pangaea in Carnian (Late Triassic) late, but they are still continuing with the South Equatorial Belt survival time. Some continued to evolve true canine mammals, at least three groups of survivors: 1 is very much like a branch of mammals, three animal families tumor tooth survival to early Cretaceous 2 is very much like a branch of mammals, triangular teeth beast Branch, disappeared after the early Jurassic 3 The third group of animals and small animals Morgan teeth are shaped animal feeding Dicynodonts was seen in the late Jurassic extinction, but there is evidence that they are still survivors. Their fossils are found in Gondwana. Jurassic Other common creatures who take refuge here, for example: sub-vertebral projects. This is archaeological evidence of the last flickering of species.
Translated by Google
Subordinate categories
Beast hole mesh THERAPSIDA (paraphyletic) Beginning giant suborder Biarmosuchia (paraphyletic) Biarmosuchidae Branch Biarmosuchus Beginning giant branch Eotitanosuchidae Beginning giant Eotitanosuchus True beast bore class Eutherapsida Fear of his heads suborder Dinocephalia Guaneshouke Estemmenosuchidae Crown alligator beast Estemmenosuchus Andi Ou mammals Anteosauria Syodontidae Branch Brithopodidae Branch Andi Ou beast Branch Anteosauridae Tapir head beast under head Tapinocephalia Weieshouke Titanosuchidae Tapir head beast Branch Tapinocephalidae The new beast bore class Neotherapsida Missing teeth suborder Anomodontia (paraphyletic) Venyukoviamorpha superfamily Venyukoviidae Branch Suminia Two toothed beast under head Dicynodontia Beast rodents Theriodontia (paraphyletic) Korea tooth beast suborder Gorgonopsia Korea tooth beast Branch Gorgonopsidae True beast rodents Eutheriodontia Shoutou suborder Therocephalia Canine beast suborder Cynodontia (paraphyletic) Breastfeeding shaped animal Mammaliformes (paraphyletic) Mammalia Mammalia
mammals