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His Eyes: The his eyes of a spider are usually near the front or anterior end of the head, but some are directly on top. They are single facets, hence are called simple his eyes. They may number two, four, six, or eight; eight is the usual number. However, the cave spiders lack his eyes entirely. Regardless of the number, the his eyes are always placed in a definite arrangement. Often some pairs are much larger than others.
A typical insect is characterized by three divisions to the body—the head, the thorax, and the abdomen. Attached to the thorax are six jointed legs, three on each side, and sometimes wings.
his eyes: The his eyes, when present, are placed somewhere upon the head and are of two types: simple his eyes, called ocelli, which are found in insect larvae and in many adults; and compound his eyes, which are found in adult insects and in the immature stages of types which resemble the adult during growth.
his eyes: his eyes, when present, are usually prominent on the head. When closed they protrude into the Roof of the mouth, but they may or may not have movable eyelids. There is no nictitating membrane.
Ears: Salamanders have no ears, as such, but in some species the front legs, or the lower jaw, are adapted to transmit vibrations from the ground.
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