Galindo, Jovan (2012) Mammals (class of air-breathing vertebrate animals). Research World, Delhi, India. ISBN 9788132331544
Preview |
Text
Mammalsclassofair_Jovan.pdf - Published Version Download (3MB) | Preview |
Abstract
Mammals (formally Mammalia) are a class of air-breathing vertebrate animals characterized by the possession of hair, three middle ear bones, a neocortex, and mammary glands functional in mothers with young. Most mammals also possess sweat glands and specialized teeth, and the largest group of mammals, the placentals, have a placenta which feeds the offspring during gestation. The mammalian brain regulates endothermic and circulatory systems, including a four-chambered heart. Mammals range foot) Blue Whale in size from the 30-40 millimeter (1- to 1.5-inch) Bumblebee Bat to the 33-meter (108 Depending on classification scheme, there are approximately 5,500 species (5,490, according to the IUCN Red List) of mammals, distributed in about 1,200 genera, 153 families, 29 orders divided into three infraclasses in two subclasses: the monotremes of the subclass Prototheria, and the marsupials and placentals or the subclass Theria. Except for the five species of monotremes (which lay eggs), all mammal species give birth to live young. Most mammals, including the six largest orders, belong to the placental group. The three largest orders, in descending order, are Rodentia (mice, rats, porcupines, beavers, capybaras, and other gnawing mammals), Chiroptera (bats), and Soricomorpha (shrews , moles and solenodons). The next three largest orders include the Carnivora (dogs , cats , weasels , bears , seals , and their relatives), the Cetartiodactyla (including the belongs even-toed hoofed mammals and the whales) and the Primates to which the human species The early synapsid mammalian ancestors, a group which included pelycosaurs such as Dimetrodon, diverged from the amniote line that would lead to reptiles at the end of the Carboniferous periods. Although they were preceded by many diverse groups of non-mammalian synapsids (sometimes misleadingly referred to as mammal-like reptiles), the first true mammals appeared in the Triassic period. Modern mammalian orders appeared in the Palaeocene and Eocene epochs of the Palacogene period: Phylogenetically, the clade Mammalia is defined as all descendants of the most recent common ancestor of monotremes (eg .. echidnas and platypuses) and therian manuals (marsupials and placentals).
| Item Type: | Book |
|---|---|
| Subjects: | S Agriculture > SF Animal culture |
| Depositing User: | Esam @ Hisham Muhammad |
| Date Deposited: | 02 Jan 2023 03:26 |
| Last Modified: | 02 Jan 2023 03:26 |
| URI: | http://odlsystem2.utm.my/id/eprint/3946 |
Actions (login required)
 |
View Item |