Porcellionides pruinosus ‘Powder Blue’, commonly called the Powder Blue Isopod, are small to medium sized isopod with a grayish blue coloration. These soft bodied isopods will grow to be 3/8” to ½” in length and will reproduce quickly once established in your setup. Powder blue isopods are very active and will spend most of their time at the surface of the soil, or hiding under decorations. Just before they molt, these isopods display a powdery white look to their exterior, which lends to their common name.