Micaria romana: While these spiders

Micaria romana: While these spiders have eight legs and two body segments, like all other spiders, they superficially resemble their primary prey, ants.Micaria romana: While these spiders have eight legs and two body segments, like all other spiders, they superficially resemble their primary prey, ants.To shed the old exoskeleton, the spider has to bust out from the inside. It increases its heart rate to pump a lot of hemolymph (the spider's blood) from the abdomen into the cephalothorax. The pressure expands the cephalothorax, which pushes on the old exoskeleton until it cracks. The spider flexes its muscles until the old exoskeleton falls away.