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KMID : 0381920070370020053
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Korean Journal of Microscopy
2007 Volume.37 No. 2 p.53 ~ p.63
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Fine Structural Analysis of the Venom Apparatus in the Spider
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Moon Myung-Jin
Yu Min-Hee
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Abstract
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The cuticular substructure of the venom apparatus in the orb-web spider Araneus ventricosus are studied with scanning electron microscopy. The apparatus is composed of chelicera and paired venom glands in the cephalothorax. Each chelicera consists of a basal segment and a movable fang that articulates with each other. The chelicera of this spider is labidognathous form that moves at right angles to the body axis, and has two segments similar to that of a folding jackknife. Each cylindrical fang has a specialized hinge joint which articulate with the cheliceral groove which contains numerous small protrusions. In addition, each side of cheliceral groove is covered with a total of 7 cuticular teeth in two rows which composed of 4 promarginal and 3 retromarginal teeth. It has been also observed that a single venom pore is always located toward the direction of retromarginal teeth, and surface cuticular pits are distributed on the cuticular depressive area of cheliceral groove.
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KEYWORD
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Araneus ventricosus, Chelicera, Fine structure, Spider, Venom
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