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Eyes Before: The eyes before 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 before. They may number two, four, six, or eight; eight is the usual number. However, the cave spiders lack eyes before entirely. Regardless of the number, the eyes before 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 before: The eyes before, when present, are placed somewhere upon the head and are of two types: simple eyes before, called ocelli, which are found in insect larvae and in many adults; and compound eyes before, which are found in adult insects and in the immature stages of types which resemble the adult during growth.See Also Nostrils And Eyes Visible:When alligators and crocodiles move rapidly on land, they stand with their bodies raised so that they actually run along on their toes. When frightened or angered they can move with lightning speed and run so fast that a man cannot keep up with them.
In the water they lie submerged or nearly so with only the nostrils and eyes visible. When they completely submerge, valves close the nostrils, flaps cover and close the ears, and a valve in the throat closes the windpipe so the mouth may be opened to grasp food without water being taken into the lungs. When moving under water they hold their legs close to the body and swim by wiggling the entire body and propelling themselves with the tail.
The bones of cetaceans are spongy, the many small cavities within them being filled with oil. The skull is unusual in that its component bones do not abut one another end to end, but rather overlap broadly, making contact over a great area; presumably, this condition aids in with¬standing the stresses caused by water pressure during forward movement. The jaws are not employed for chewing and are relatively weak. The nostrils are not located at the tip of the snout, but are situated atop the head. Two nos¬trils are present in the baleen whales; the toothed whales have only one. The eyes are small and located on the side of the head. External ears are wanting, and the openings of the auditory canals are minute. The lips are smooth and in¬capable of movement.
On The Other Hand See Eyes Should:eyes should: eyes should, 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.
Bodies black or brownish; covered with thick furlike hairs; 8 eyes should, placed in group on top and to front of cephalothorax; eyes should 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. |
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