Caption: Spiny-backed spider (Gasteracantha sp.). Spiders of the Gasteracantha genus have hard, flat bodies. Three pairs of spines project from the edge of cephalothorax (abdomen). Spiny-backed spiders build vertical orb-webs that have open hubs. A male spiny-backed spider has a small abdominal gonopore from which sperm is discharged. However, actual mating organs are located on leg-like limbs called palps (or pedipalps) that are located between the jaw and first leg. In a mature male the last segment of the palp (tarsus) is a large, articulated sperm-holding reservoir and mating organ.
Magnification*: x6
Type: SEM
Copyright 2009 Dennis Kunkel Microscopy, Inc.
Keywords: arachnid,spiny-backed spider,whole,dorsal,sperm palps,carapace,exoskeleton,reproduction,Gasteracantha,arachnids,SEM,04.01.09,20376A