Amniote
Amniote
Amniote (pronunciation: /ˈæmni.oʊt/) is a term used in the field of Biology to describe a group of tetrapod vertebrates that have a terrestrially adapted egg. The term is derived from the Greek words 'amnion' (meaning 'membrane around the fetus') and 'ota' (meaning 'ear').
Etymology
The term 'Amniote' is derived from the Greek word 'amnion', which refers to the membrane that surrounds the fetus in the womb, and 'ota', which means 'ear'. This is in reference to the amniotic egg, which is a key characteristic of this group of animals.
Definition
Amniotes are a group of tetrapod vertebrates that are characterized by having an egg adapted for life on land. This egg, known as an amniotic egg, is surrounded by a hard shell and contains a series of membranes that protect and nourish the developing embryo. The main groups of amniotes are the reptiles, birds, and mammals.
Characteristics
Amniotes are distinguished by several key characteristics, including:
- The presence of an amniotic egg, which is adapted for terrestrial life.
- The presence of a hard shell around the egg, which provides protection and prevents desiccation.
- The presence of internal fertilization, which allows for the development of the embryo within the protective environment of the egg.
- The presence of specialized membranes within the egg, including the amnion, chorion, yolk sac, and allantois.
Related Terms
- Tetrapod: A four-limbed vertebrate, which includes amniotes as well as amphibians.
- Reptile: A group of amniotes that includes snakes, lizards, turtles, crocodiles, and birds.
- Bird: A group of amniotes that are characterized by feathers, beaks, and hard-shelled eggs.
- Mammal: A group of amniotes that are characterized by hair, mammary glands, and internal gestation.
External links
- Medical encyclopedia article on Amniote
- Wikipedia's article - Amniote
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