A Tetragnathidae (Plesiometa argyra) 102208 pg 2

Plesiometa argyra 102208 ventral corpusThe image on the right, an enlargement of the spider photographed by Alison M., shows the longitudinal bands flanking the venter. This spider is often parasitized by an ichneumonid wasp, Hymenoepimecis argyraphaga. The wasp stings the spider into temporary paralysis and glues an egg to its abdomen. Later the spider recovers. The wasp egg hatches and, over the next 7-14 days, as the larva feeds on the host's body fluids through holes it cuts into the spider's abdomen, the spider continues all normal functions as though unencumbered. The wasp larva molts to the second instar and, on the night it kills the spider, introduces a chemical into the host's blood that induces it to build a unique cocoon web of strong, dragline silk. The larva immediately molts to the third instar, kills the spider, and consumes it. The next evening the larva spins a cocoon and, in 4 more days, pupates. The adult wasp emerges about 7 days later. This intriguing sequence, an excellent example of parasitic manipulation of host behavior, is described in detail by William G. Eberhard in vol. 29, J. Arach 29:354-366 ----FINIS---- PAGE MENU:   1  *  2  *  

* TERMITE ENCOUNTERS  *  SNAKE ENCOUNTERS SNAKE BITE FIRST AID * SNAKE EXCLUSION * SPIDER ENCOUNTERS * SPIDER BITE FIRST AID * SPIDER EXTERMINATION * PUSS CATERPILLAR ENCOUNTERS * PUSS CATERPILLAR FIRST AID * PUSS CATERPILLAR EXTERMINATIONAssembled & Edited by Jerry Cates. Questions? Corrections? Comments? BUG ME RIGHT NOW! ---- Ph: 512-331-1111 ---- E-Mail ---- Privacy ----BugsInTheNews * --0a0s--