Pillbugs: More than you want to know


Steve Roark - Tri-State Outside



If you’ve ever picked up an old board or a rock that’s been lying on the ground a while, you’ve no doubt found pillbugs, which live in moist, dark places. They are also known as sowbugs or rolie polie bugs, but are called Isopods by the science guys.

The common pillbug (Armadillidium vulgare) is classified as a crustacean, and so are kin to lobsters, shrimp and crayfish. They breathe through gill-like structures, and so need a very moist environment to survive. They cannot however breathe underwater. Isopods are harmless to humans, and perform the important function of eating rotten or dying plant material and enriching the soil with their excretions. They do not see well, and depend heavily on smell, which they sense through their antennae. Because they need moisture, they even have humidity seeking scanners.

There are other oddities about pillbugs that make them pretty unique critters. Every kid on the planet has no doubt messed with pillbugs until they curl up into a ball (hence the name), which is a defensive maneuver. Like other crustaceans, pillbugs tote their eggs around with them in a special pouch called a marsupium. Pillbugs do not urinate. One of the reasons we pee is to get rid of toxic ammonia gas, which our body converts to liquid urea for excretion. Pillbugs simply pass ammonia gas out through their exoskeleton, so they don’t have to pee, but they do have to toot a lot.

Pillbugs are able to drink water not only through their mouth, but also through their anal opening (we are leaving unique and passing into weird). They eat their own poop… actually they eat other animal’s poop too, but they eat their own to recover the element copper, which they need a lot of to function (weird just showed up in the rear view mirror). Impress your friends by knowing what coprophagy means (the eating of feces or dung). Pillbugs have blue blood. Hemoglobin is what carries oxygen in our blood, which is red because it’s iron based. Pillbug blood uses something called hemocynain to carry oxygen around, which is copper based, and so has a blue color. As with things in nature, there’s more to a pillbug than meets the eye.

Steve Roark is the area forester in Tazewell, Tennessee, for the Tennessee Department of Agriculture, Forestry Division.

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Steve Roark

Tri-State Outside

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