Mammalia
Mammalia
Mammalia (pronunciation: /məˈmeɪliə/ or /məˈmɑːliə/) is a class of vertebrate animals distinguished by the presence of mammary glands, which in females produce milk for the nourishment of young. The term "Mammalia" is derived from the Latin word "mamma", meaning "breast".
Etymology
The term "Mammalia" was coined by Carl Linnaeus in the 18th century, derived from the Latin word "mamma" which means "breast". This is in reference to the defining characteristic of mammals – the presence of mammary glands.
Characteristics
Mammals are characterized by several unique features not found in other animals. These include the presence of mammary glands, which produce milk used to feed young, and the presence of hair or fur. Mammals also have a unique jaw structure, with a single bone on each side, and three middle ear bones.
Classification
Mammals are classified into three main groups: Monotremes, Marsupials, and Placentals. Monotremes are the most primitive group, and include animals like the platypus and echidna. Marsupials give birth to relatively undeveloped young, which continue to develop outside the womb, typically in a pouch. Placentals, the largest group, give birth to fully developed young.
Related Terms
- Monotremes: A group of mammals that lay eggs rather than giving birth to live young.
- Marsupials: A group of mammals characterized by giving birth to relatively undeveloped young.
- Placentals: The largest group of mammals, characterized by giving birth to fully developed young.
- Mammary Glands: The milk-producing glands in mammals.
External links
- Medical encyclopedia article on Mammalia
- Wikipedia's article - Mammalia
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