<Li> Loxosceles reclusus orthographic variant </Li> <P> The brown recluse, Loxosceles reclusa, Sicariidae (formerly placed in a family "Loxoscelidae") is a recluse spider with a necrotic venom . Similar to other recluse spider bites, their bite sometimes requires medical attention . The brown recluse is one of three spiders (the others being black widow and Loxosceles laeta, the Chilean recluse) with medically significant venom in North America . </P> <P> Brown recluse spiders are usually between 6 and 20 millimetres (0.24 and 0.79 in), but may grow larger . While typically light to medium brown, they range in color from whitish to dark brown or blackish gray . The cephalothorax and abdomen are not necessarily the same color . These spiders usually have markings on the dorsal side of their cephalothorax, with a black line coming from it that looks like a violin with the neck of the violin pointing to the rear of the spider, resulting in the nicknames fiddleback spider, brown fiddler, or violin spider . </P> <P> The violin pattern is not diagnostic, as other spiders can have similar markings (e.g. cellar spiders and pirate spiders). For definitive identification it is imperative to examine the eyes . While most spiders have eight eyes, recluse spiders have six eyes arranged in pairs (dyads) with one medial pair and two lateral pairs . Only a few other spiders have three pairs of eyes arranged in this way (e.g., scytodids). Recluses have no obvious coloration patterns on the abdomen or legs, and the legs lack spines . The abdomen is covered with fine short hairs that, when viewed without magnification, give the appearance of soft fur . The leg joints may appear to be a slightly lighter color . </P>

What is the actual size of a brown recluse