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Mammalia is an animal.
Foreign name
Mammalia
Outline
Mammalia
Mammalia；mammals
VertebrateAn outline of.It is commonly called mammal.Body hair;Body temperature is constant;Fetal birth (except monotreme) and lactation;The left and right chambers of the heart are completely separated, and the left ventricle pumps blood to all parts of the body through the left arterial arch;Cranial enlargement and brain volume increase;The middle ear has three ossicles;The mandible is composed of one tooth bone, which is articulating with the skull in the form of tooth squamous bone;The teeth are divided into incisors, canines and buccal teeth;There are 7 cervical vertebrae, and the first and second cervical vertebrae differentiate into the annulus and axis.Mammalia is a natural group with the highest evolutionary status in the animal kingdom. Except for the south and arctic centers and individual islands, it is almost all over the world, with 4237 species belonging to 1042 genera, 123 families, 19 orders.There are 11 orders in China, all of which have placentas.North China belongs to the Palaearctic realm, and the representative families of Mammalia include pikasidae, beaver family, muridaeCapridae, Dormouse family, the southern part of China belongs to the Oriental realm, and the representative families are Gibbonidae, Lazybasidae, Giant Panda family, Viverridae, Muscaridae, Pangolinidae, Pteropodidae, Elephant familyPigtail ratFamily, Bambusoideae, etc.The advancement of mammals is shown in the following aspects: highly developed brain;Constant temperature and prenatal lactation.
Mammals (including fossils and living species) can be divided into Protozoa and Fauna.Protozoa includes extinct Mesozoic mammals and now Monotreme.Monotremes include echidna andplatypusIt is native to Australia, Tasmania and New Guinea. There are only 6 species, 3 genera, 2 families, 1 order.In addition to the Mesozoic Ancestor and the Inferior Class of Zodiac, there are also the Inferior Class of Postfauna, including various marsupials, which are native to South America, North America, Australia and adjacent islands, with a total of 1 order, 9 families, 81 genera and about 250 species;Euzoa, including various placental species, is widely distributed around the world.In addition to the extinct orders, there are 17 orders, 112 families, about 958 genera and 3981 species.
