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KMID : 0364219900330030354
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Korean Journal of Zoology
1990 Volume.33 No. 3 p.354 ~ p.364
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Fine Structural Study on the Capture Threads-producing Organs in Nephila clavata L. Koch (Araneae: Araneidae) II. Flagelliform Glands
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Moon Myung-Jin
Kim Woo-Kap
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Abstract
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The ultrastructure and silk formational process of the flagelliform glands, one of the capture thread producing organs in the orb web spider (Nephila clavata L. Koch), have been studied with electron microscope. A pair of flagelliform glands consist of three distinct regions: excretory duct, storage sac and convoluted tail. This gland is connected to the large spinning tube (spigot) of the posterior spinnerets with two pairs of aggregate glands, and showed a characteristic spigot structure called "triad". The excretory duct consists of three long segments surrounded by the same sheath of connective tissue. The distal duct near the spinning tube bears the electron lucent subcuticles which have the functions of water removal and orientation of the silk fiber, whereas the proximal duct near the sac contains the cuticule precursor transported through the intercellular space. Cytoplasms of the sac and tail regions have well developed rough endoplasmic reticulum and contain the round secretory granules commonly, but the electron densities and internal textures of the granules do not coincided. Adjacent epithelial cells are connected with the specialized septate junctions, and secretory granules accumulated at the apical pole are released to the lumen by the apocrine secretion.secretion.
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KEYWORD
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Fine structure , Flagellifrom glands , Spider capture threads
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Listed journal information
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