Spiders

Among these invertebrates the spider’s community is large and diverse. Furthermore the spider was considered as less important organisms in the past by many researchers (Butt and Beg, 2001). The spiders are the dominant and grasping predator’s which belong to order Aranae (Riechert, 1984). The spiders habitually present in grounds, walls, under stones, in wild tree, grassy land and also prefer moist places. The region for some spider is freshwater including Argyroneta aquatic (water spiders) (Karren, 2002). In Carboniferous period (360 to 290 million years) the spider fossil with segmented abdomen were identified. The spider have eight legs and the body is divided into cephalothorax, abdomen and pedipalps and producing silk (Turnbull, 1973). Spiders are also known as poisonous arthropods (Perveen and Jamal, 2012). The spiders origin is not clear, although many scientists thought that the spiders originated in the sea, later on they emerge in two groups, one group with and one without leg extensor muscles. The importance of spiders increases as the work done on spider fauna in different areas of world was given by (Dyal, 1935), (Tahir, 2009), (Butt and Beg, 2001), (Mushtaq and Qadir, 1999), (Khatoon, 1985-1986), (Ghafoor and Beg, 2002), (Butt et al., 2006), (Ursani and Soomro, 2010), (Mukhtar, 2004), (Arshad et al., 1984.