This spider belongs to the family of spiders that spin
their webs in spirals - the orb weavers. The Arrowshaped
Micrathena hangs in the center of its orb web and can
be mistaken for a bit of wood, bark, or leaf.
The male spider is 1/4 inch long and the female is
only slightly larger, up to 3/8 inch long. The brightly
colored abdomen is elevated and covered with pairs of
pointed spines (the males lack spines). It has an enlarged
pair of spines toward the rear of the abdomen that give
this spider its arrowhead shape.