Tetrapod
Tetrapod
Tetrapod (/ˈtɛtrəˌpɒd/; from Greek: τετρα- "four" and πούς "foot") refers to any vertebrate that has four limbs. This includes amphibians, reptiles, birds, and mammals. Tetrapods evolved from a group of animals known as the lobe-finned fishes around 375 million years ago during the Devonian period.
Etymology
The term "tetrapod" is derived from the Greek words "tetra-", meaning four, and "-pod", meaning foot. This is a direct reference to the four-limbed nature of these animals.
Evolution
The first tetrapods evolved from a group of lobe-finned fishes during the Devonian period. This evolution was a significant event in the history of life on Earth as it marked the transition from aquatic to terrestrial life. The first tetrapods are believed to have evolved in shallow and swampy freshwater habitats.
Classification
Tetrapods are classified under the superclass Tetrapoda, which is further divided into four classes: Amphibia, Reptilia, Aves, and Mammalia. Each of these classes is characterized by unique features and adaptations that have enabled them to thrive in different environments.
Anatomy
Tetrapods are characterized by a number of anatomical features, most notably their four limbs. Each limb typically ends in digits (fingers or toes), although the number of digits can vary among different groups of tetrapods. Other key features include a well-developed vertebral column, a four-chambered heart, and a fully developed respiratory system that includes lungs.
Related Terms
External links
- Medical encyclopedia article on Tetrapod
- Wikipedia's article - Tetrapod
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