Great Transitions: The Origins of Tetrapods Educator Materials.
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Anatomical features of early tetrapods. The tetrapod's ancestral fish must have possessed similar traits to those inherited by the early tetrapods, including internal nostrils (to separate the breathing and feeding passages) and a large fleshy fin built on bones that could give rise to the tetrapod limb. The rhipidistian crossopterygians fulfill every requirement for this ancestry.
Tetrapods Concrete Tetrapods are a proven established solution used world-wide for coastal erosion. The Tetrapod shape is designed to dissipate the force of incoming waves by filtering the energy and allowing water to flow around, rather than against it. Stability is dictated by self-weight and interlocking with surrounding units making them difficult to dislodge. Earlier barrier material used.
Definitions. Tetrapods can be defined in cladistics as the nearest common ancestor of all living amphibians (the lissamphibians) and all living amniotes (reptiles, birds, and mammals), along with all of the descendants of that ancestor. This is a node-based definition (the node being the nearest common ancestor). The group so defined is the crown group, or crown tetrapods.
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This article primarily focuses on extinct tetrapods. For Wikipedia's article on Tetrapods, including modern-day ones, click here. The earliest tetrapods radiated from the Sarcopterygii, or lobe-finned fish, evolving into air-breathing amphibians in the Devonian period. Contents(show) Evolution Devonian tetrapods Research by Jennifer A. Clack and her colleagues showed that the earliest.