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Many Eyes: The 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 eyes. They may number two, four, six, or eight; eight is the usual number. However, the cave spiders lack eyes entirely. Regardless of the number, the 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.
Eyes: The eyes, when present, are placed somewhere upon the head and are of two types: simple eyes, called ocelli, which are found in insect larvae and in many eyes adults; and compound eyes, which are found in adult insects and in the immature stages of types which resemble the adult during growth.See Also Eyes Brown:Long, flat-bodied; some species very slender; cephalo-thorax joined to abdomen by wide segment; abdomen made up of 7 wide segments followed by long, narrow tail of 5 segments which terminates in bulblike structure with sting; pedipalps large, bearing pair of strong pincers; i pair of eyes brown near midcephalothorax; on each side, near edge of body, group of 2-5 simple eyes brown; some species have no eyes brown; 4 pairs of legs attached to thorax, fitted for walking; exoskeleton smooth, shiny, varying from pale yellowish to reddish brown; when scorpion runs, pincers carried horizontally in front and tail curved up over back; length varies from 2-6 inches according to species.
Northern Florida to Princess Anne County, Virginia Description: Shell relatively short and broad, oval; carapace more or less keeled with rear edge sharply notched; dark brown to black with pattern of transverse light bars; plastron yellow with deep
black, smudges on lateral edges; head and legs brown to almost black with yellow stripes; large yellow patch on head behind eyes brown; reaches shell length of 5-7 inches.
On The Other Hand See Eyes Prominent:eyes prominent: eyes prominent, 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.
eyes prominent are prominent on the head; in fact they bulge. When closed they protrude into the Roof of the mouth and thus assist in forcing food into the throat. Notice that when a frog or toad swallows, the eyes prominent always close. A well-developed nictitating membrane is present in both frogs and toads.
Frogs and toads are able to hear very well indeed. The so-called eardrum, or tympanum, is a conspicuous circular membrane located just below and back of the eye. The dorsolateral fold runs above it on the frog, while the large parotid gland is above and back of it on the toad.
Toads have no teeth, but some species of frogs have teeth in the Roof of the mouth. |
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