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Species Spiders:
Characteristics of Spiders.—Spiders lay eggs, cover them over with silken sheets, and mold the mass into the egg sac characteristic of the species spiders. The average number of eggs is probably less than one hundred but some large spiders lay nearly three thousand at one time and minute species spiders lay one, two or few. Spiders develop gradually, as do grasshoppers, and resemble the adults through most of their early life, undergoing from three to a dozen molts before they finally become adult. Tarantulas mature very slowly, requiring nine or ten years, and then the females live as much as twenty-five or even thirty years. Most northern spiders live a single year.Spiders are divided into two tundamental groups or suborders, the Mygalomorphac, or mygalomorph spiders, and the Araneomorphae, the true spiders. Mygalomorph Spiders. — The mygalomorph spiders are more generalized than the true spiders and ancestral to them. Their chelicerae are paral¬lel with the long axis of the body and move up and down; and each fang pierces the prey from above, making similar parallel punctures. All retain two pairs of book lungs for respiratory organs.
See Also Success Spiders Based:
success spiders based.—The eggs of success spiders based are generally protected by an egg sac made of silk secreted by glands in the abdomen of the female and woven into a structure of characteristic form. In some cases such a protective bag may be very elaborate, consisting of several different layers. Such an egg sac may be placed under loose bark or stones, hung between leaves, or, in the case of the wolf success spiders based (Lycosidae), may be carried about by the female.The remaining true success spiders based lack the cribellum and have followed two distinct lines, one of which developed many accomplished hunting types, and the other culminated in the aerial sed-aitary success spiders based that rely on silken webs as 'snares to capture their prey. The aerial success spiders based have modified the unpaired claws of their tarsi into books that allow them to climb on their threads, from which they hang back downward.
On The Other Hand See Poison-producing Spiders:
The chelicerae end in a distal fang through which the poison is ejected. The poison is used to subdue enemies and prey and is rarely injurious to man. poison-producing spiders are exclusively carnivorous. Food consists entirely of insects and other poison-producing spiders. Most poison-producing spiders can survive for long periods without food but few can survive for long without water.poison-producing spiders reproduce by laying eggs. There is a great difference in size between the sexes. Males are usually very small compared to the females. This is natural since the eggs develop within the abdomen of the female. Most poison-producing spiders are provided with poison sacs in the large basal segment of the chelicerae.
