The higher classification of the class mammalia is based on consideration of a broad array of characters. traditionally, evidence from comparative anatomy was of predominant importance, but, more recently, information from such disciplines as physiology , serology (the study of immune reactions in body fluids), and genetics has proved useful in. The skull is dicondylic. the trunk is divided into thorax and abdomen. the mammals respire through lungs. good sense of hearing as mammals are aided with 3 middle ear bones. mammals have a four chambered heart. the sinus venous and renal portal system are absent. presence of single boned lower jaws.
In this article we will discuss about: 1. definition of mammals 2. general characters of mammals 3. scheme of classification. definition of mammals: among vertebrates, mammals became most fully suited for life on land. there are many species of mammals in which the process of life are carried on under conditions far remote from those in which life first arose. the information in their dna. Mammal, (class mammalia), any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother. in addition to these characteristic milk glands, mammals are distinguished by several other unique features. hair is a typical mammalian feature, although in many whales it has disappeared. Mammals are warm blooded, hair bearing vertebrates that produce milk. mammals represent a diverse and fascinating class of animals, encompassing a wide range of species from tiny shrews to humans to the colossal blue whale. as members of the class mammalia, they share certain defining characteristics that set them apart from other animal classes. General characteristics of class mammalia: 1. these animals are warm blooded, hairy and have mammary or milk producing glands, (mammary glands). they are the only animals which nourish their young ones with milk. there are about 4,000 species of mammals found in the world. 2.
Mammals are warm blooded, hair bearing vertebrates that produce milk. mammals represent a diverse and fascinating class of animals, encompassing a wide range of species from tiny shrews to humans to the colossal blue whale. as members of the class mammalia, they share certain defining characteristics that set them apart from other animal classes. General characteristics of class mammalia: 1. these animals are warm blooded, hairy and have mammary or milk producing glands, (mammary glands). they are the only animals which nourish their young ones with milk. there are about 4,000 species of mammals found in the world. 2. The only class of mammals that lay eggs are prototheria. their reproductive system has characteristics from both reptiles and mammals. the eggs are leathery and resemble reptile eggs in yolk composition. 2. cloaca: cloaca, a single orifice for elimination of waste and reproduction, is a feature of monotremes. Mammalia is a class of animal within the phylum chordata. mammal classification has been through several iterations since carl linnaeus initially defined the class. no classification system is universally accepted; mckenna & bell (1997) and wilson & reader (2005) provide useful recent compendiums. [ 1].
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