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TAILIEUCHUNG - A morphological study of the venom apparatus of the spider Allopecosa fabilis (Araneae, Lycosidae)

The morphological structure of the venom apparatus of Allopecosa fabrilis was studied using scanning electron microscopy (SEM). The venom apparatus is situated in the prosoma and is composed of a pair of chelicerae and venom glands. | Turk J Biol 28 (2004) 79-83 © TÜB‹TAK A Morphological Study of the Venom Apparatus of the spider Allopecosa fabilis (Araneae, Lycosidae) Külti¤in ÇAVUfiO⁄LU, Meltem MARAfi, Abdullah BAYRAM Department of Biology, Faculty of Art and Science, K›r›kkale University, 71450, Yahflihan, K›r›kkale - TURKEY Received: Abstract: The morphological structure of the venom apparatus of Allopecosa fabrilis was studied using scanning electron microscopy (SEM). The venom apparatus is situated in the prosoma and is composed of a pair of chelicerae and venom glands. Each chelicera consists of 2 parts, a stout basal part covered by hair, and a movable fang. A venom pore is situated on the subterminal part of the fang. Just below the fang, there is a cheliceral groove next to the teeth. Each side of the groove is covered with cuticular teeth. The venom glands are large and roughly cylindrical. Each gland is surrounded by completely striated muscular fibers. The venom produced in the venom glands by contraction of these muscular fibers is ejected into the fang through a canal and the venom pore. Key Words: Venom gland, chelicerae, scanning electron microscope, Allopecosa fabrilis, venom Allopecosa fabrilis (Aranea, Lycosidae) Örümce¤inin Zehir Ayg›t› Üzerine Morfolojik Bir Çal›flma Özet: Bu çal›flmada, Allopecosa fabrilis’in zehir ayg›t›n›n morfolojik yap›s› taramal› elektron mikroskobu kullan›larak (SEM) incelendi. Zehir ayg›t› prosomada yerleflmifl olup, bir çift keliser ve zehir bezlerinden ibarettir. Her bir keliser, k›llarla kapl› kal›n bir bazal k›s›m ve hareketli bir zehir difli olmak üzere iki k›s›mdan oluflur. Zehir diflinin alt k›sm›nda bir zehir aç›kl›¤› yer al›r. Zehir diflinin hemen alt›nda, keliser difllerine yak›n bir keliseral boflluk bulunmaktad›r. Bofllu¤un her bir kenar› kutikular difllerle çevrilidir. Zehir bezleri büyük ve flekil bak›m›ndan silindiriktir. Her bir bez, tamamen çizgili kas lifleri ile çevrelenmifltir. Bu kas liflerinin kas›lmas›yla .

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