Fine Structure of the Silk Spigots in the Spider Dolomedes sulfureus (Araneae: Pisauridae)
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Dolomedes spiders of the family Pisauridae are one of free wandering spiders with semi-aquatic habitation. They do not build web for prey-hunting but build a nursery web for spiderlings. This paper describes the fine structure of the silkspinning spigots of the fishing spider Dolomedes sulfureus revealed by the field emission scanning electron microscope (FESEM). The fishing spider Dolomedes sulfureus possesses only three types of silk glands which connected through the typical spinning tubes on the spinnerets. The silk spigots of this spider were identified as three groups: ampullates, pyriforms and aciniforms. Two pairs of major ampullate glands send secretory ductules to the anterior spinnerets, and another two pairs (or 1~2 pairs in males) of minor ampullate glands supply the middle spinnerets. In addition, the pyriform glands feed silk into the anterior spinnerets (62~68 pairs in females and 45~50 pairs in males), and the aciniforms send ductules to the middle (33~40 pairs in females and 18~25 pairs in males) and the posterior spinnerets (42~50 pairs in females and 24~28 pairs in males). Among these, the ampullate one is the most predominate gland in both sexes.
Abstract
Dolomedes spiders of the family Pisauridae are one of free wandering spiders with semi-aquatic habitation. They do not build web for prey-hunting but build a nursery web for spiderlings. This paper describes the fine structure of the silkspinning spigots of the fishing spider Dolomedes sulfureus revealed by the field emission scanning electron microscope (FESEM). The fishing spider Dolomedes sulfureus possesses only three types of silk glands which connected through the typical spinning tubes on the spinnerets. The silk spigots of this spider were identified as three groups: ampullates, pyriforms and aciniforms. Two pairs of major ampullate glands send secretory ductules to the anterior spinnerets, and another two pairs (or 1~2 pairs in males) of minor ampullate glands supply the middle spinnerets. In addition, the pyriform glands feed silk into the anterior spinnerets (62~68 pairs in females and 45~50 pairs in males), and the aciniforms send ductules to the middle (33~40 pairs in females and 18~25 pairs in males) and the posterior spinnerets (42~50 pairs in females and 24~28 pairs in males). Among these, the ampullate one is the most predominate gland in both sexes.
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