The life history and morphogical characteristics of Allagelen difficilis
Allagelen difficilis (Fox) is common to be seen in China.They play an important role in pests' control of natural ecosystems.We combine field survey with indoor rearing to investigate its life history and the characteristics of each instar.A.difficilis produces one generation per year and developed into adults after 6 molts.This spider overwinters as adults,eggs and 1 st instar spiderling.In early April of the following year after hatching,the 2nd instar was seen on the surface of the cocoon.They develop into adults in mid-August.A.difficilis requires a mean developmental period of 265 days from eggs laying to maturity.The eggs are ellipsoidal and yellow.The body of 1 st-3rd instar spiderling is bright,maroon or brown.Four pairs Splayed grey stripes were seen on the back of abdomen of 3rd instar spiderling.The brightness disappears and Splayed grey stripes become more obvious during the period of their 4th-6th instar.The pedipalps of the spider will enlarge and are translucent,when the male is 6th instar,and then become black as adults.The leg formula of each age instars is:Ⅳ ⅠⅡ Ⅲ.
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万方数据
维普
