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| Micrathena gracilis ： ウィキペディア英語版 |
Spined micrathena
''Micrathena gracilis'' is a spider in the family Araneidae (orb-weavers), commonly known as the spined micrathena. This spider spins a moderately large (can be 30 cm (11.81 in) or more across), very tightly coiled web, often in wooded or brushy areas. Some call it the "CD spider" because its webs can make it appear as though there are compact discs hanging from the trees. It is completely harmless to humans.
==Physical characteristics==
The only web-building members of the species are the females. Females are 8-10 mm long. They exhibit a bulbous abdomen with a total of ten spines. Males exhibit a fair amount of sexual dimorphism. They tend to be around only half the size of the females. Also, they have fewer spines, a flatter abdomen, and a slightly lighter tone. Although males can produce silk, they mostly use it in the mating ritual, which frequently also proves fatal.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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