Verified Answer :

This 350 million year old animal, the first tetrapod, hadlimbs with one long bone (the humerus) attached to two other long bones (the radius and ulna). Its descendants, including whales, lizards, humans, and birds, as well as many others, inherited the tetrapod limb from this ancestor. Not all similarity is homology.

Histrionicus

The six bones found in all tetrapod legs - humerus, radius, ulna, metacarpals, carpals, and phalanges

Tetrapod

refers to four-limbed vertebrates. Tetrapods are a group of vertebrates that includes amphibians, reptiles, birds, and mammals.

  • One of the key characteristics of tetrapods is that they have four limbs or, their ancestors had four limbs
  • These include a pair of bones, the ulna and radius, and the tibia and fibula in the epipodial segments of the forelimbs and hind limbs respectively
  • The six bones found in all tetrapods legs are
  1. the humerus,
  2. the radius,
  3. the ulna,
  4. the carpals,
  5. the metacarpals
  6. phalanges

Thus, The six bones found in all tetrapod legs - humerus, radius, ulna, metacarpals, carpals, and phalanges

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