_____ is the name of the skull element that becomes the major pectoral support structure in early tetrapods.
Answer:
Cleithrum
Explanation: Cleithrum is the primitive bone which is present in the skull of the primitive osteichthyes and also in few of the early tetrapods which include many genera (also the extinct ones like Acanthostega).
The cleithrum bone is known to run towards the bone scapula which is a component of the pectoral girdle. A pectoral girdle is the bones which helps in the association of the fore arm bones with the main body axis. The bone also is responsible for the free rotation and movements of the skull.
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