Ok here is my 2 cents on educating us as to the sow and pill bugs..very similar yet they say different so here is the basic facts on them .....am looking further to find any other "juicy" info I can find too LOL
Sowbugs are land crustaceans which look very similar to pillbugs, at least at first glance. Sowbugs are small crustaceans with oval bodies when viewed from above. Their back consists of a number of overlapping, articulating plates. They have 7 pairs of legs, and antennae which reach about half the body length. Most are slate gray in color, and may reach about 15 mm long and 8 mm wide.
The pillbug on the other hand has a rounder back, from side to side, and a deeper body, from back to legs. When disturbed, it frequently rolls into a tight ball, with its legs tucked inside, much like its larger but dissimilar counterpart the armadillo.Pill Bugs
Sowbugs have gills which need constant moisture, so they tend to live in moister northwest climates. They are primarily nocturnal, and eat decaying leaf litter and vegetable matter. They may also feed on the tips of young plants, so can be considered pests, but they also help the environment by breaking up decaying plant matter and help speed up the recycling of the nutrients they contain.
Armadillidiidae is a family of woodlice, a terrestrial crustacean group in the order Isopoda. Unlike members of the family Porcellionidae, members of this family can roll into a ball, giving them their common name of "pill bug," "potato bug", "doodlebug", or the the more recent and increasingly popularized term, "roly-poly," which has been used regionally as early as 1968.[1] The most well known example is Armadillidium vulgare, the common pill bug. These arthropods commonly feed on decaying vegetation and are found under logs, garbage pails or any other place where moisture can be found. Moisture is essential to pill bugs due to their breathing organs, which are like gills. Pill bugs, although often thriving in damp areas, have often been known to live in dry beds.