The visceral skeleton is one of the two major bone groups in the body, the other being the axial skeleton and it consists of the upper and lower extremities, which include the shoulder and pelvis.
The compound eyes of insects resemble so closely the similar organs in Crustaceans that there can hardly be reasonable doubt of their homology, and the primitively appendicular nature of the eyes in the latter class suggests that in the Hexapoda also they represent the appendages of an anterior (pro
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