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Their Eyes: The their 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 their eyes. They may number two, four, six, or eight; eight is the usual number. However, the cave spiders lack their eyes entirely. Regardless of the number, the their 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 abdo¬men. Attached to the thorax are six jointed legs, three on each side, and sometimes wings.
their eyes: The their eyes, when present, are placed somewhere upon the head and are of two types: simple their eyes, called ocelli, which are found in insect larvae and in many adults; and compound their eyes, which are found in adult insects and in the immature stages of types which resemble the adult during growth.See Also Small Eyes On Cephalothorax:Spiders have but two divisions to the body. The head and thorax are fused into one structure called the cephalothorax, which means head and thorax. The forward por¬tion of the cephalothorax bears the small eyes on cephalothorax, the mouthparts, and the pedipalps; the remainder bears the eight jointed legs. Trie cephalo¬thorax is joined to the abdomen by a stalklike pedicel, which means little foot, and bears no appendages.
Bodies black or brownish; covered with thick furlike hairs; 8 small eyes on cephalothorax, placed in group on top and to front of cephalothorax; small eyes on cephalothorax with but a single facet; 8 legs, also covered with furlike hairs; largest of all spiders in United States—may reach body length of 3 inches.
On The Other Hand See Eyes When:eyes when: eyes when, 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 mem¬brane.
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.
The American goosefish (Lophius americanus), a typical species, is found along the American At¬lantic coast from Nova Scotia to Brazil. It has a narrow tadpolelike body and a large flattened head, and is very soft in texture. It has three slender bristlelike spines—part of the spiny dorsal fin—on the top of its head. The first of these spines is found immediately behind the snout, the second a little in front of the eyes when, and the third behind the eyes when. |
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