Wolf Spiders Lyco-sidae:
The wolf spiders Lyco-sidae spiders (Lyco-sidae) are largely ground forms that run as va¬grants or live in burrows deep in the soil. They carry the round egg sac behind them, attached to their spinnerets, and the young climb upon the body of the mother after the hatching and remain there about a week. The fisher spiders (Pisauri-dae) live near water, into which they dive and on which they skate, and carry the large egg bag beneath their sternum, held by their chelicerae.Most modern Koples regard spiders with aversion because of :he cobwebs they spin and their reputed ven->mous properties. Shy creatures that rarely bite nan, spiders have venoms that produce small :ffect, for the most part, on warm-blooded ani-nals. Hematoxins and neurotoxins in the ven-ims of a very few species cause local and sys-emic symptoms of variable severity in man, more jrave in children and occasionally even causing leath. In temperate regions the only spiders to >e feared are the species of Latrodectus (q.v. ilack widows, etc.) which have an exclusively leurotoxic vaiom. In the tropics several other cinds are dangerous, notably the wolf spiders Lyco-sidae spiders [Lycosa raptoria, etc.) of southern Brazil and he burrowing tarantulas (Atrax) of Australia. V serum has been prepared for the wolf spiders Lyco-sidae spider lites, which quickly clears up the severe local esions.
See Also Relatives Spiders Scorpions:
Near relatives spiders scorpions of spiders are scorpions, har-vestmen, mites, whip-scorpions and other land arachnids; more distant ones, the aquatic king crabs (Limulus, etc.) and the fossil eurypterids. Fossil spiders are found in the Rhynie Chert of the Devonian, were well developed in the Car¬boniferous, and occur abundantly in Baltic amber (Oligocene of Europe) and in Florissant shales (Oligocene in America).Scorpions are true arthropods and belong with the spiders to the class of arachnids. But they are so distinctive in other characteristics that they are placed in an order all their own, that of Scorponida. Scorpions do not occur in great number nor are they as widely distributed as the spiders. They are secretive in their habits and active only at night, so they are not commonly seen by man.
On The Other Hand See Groups Spiders Gain:
Spiders are divided into two tundamental groups spiders gain 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.The male runs considerable risk in ap¬proaching his usually much larger mate, who may be only hungry and not ready for mating. Some are killed because of this failure to diag¬nose the attitude of the female or, after being successful in their suit, of failing to leave the premises before normal predatory instincts again dominate the female. Various routines have been devised by groups spiders gain of spiders to gain recognition. The far-sighted jumping spiders posture and dance before her, each in a characteristic manner, and the web spinners tweak the threads of the web until they are allowed to approach.
