The Porcellionides pruinosus 'Oreo Crumble' is a popular, captive-bred colour morph of the plum woodlouse, named for its distinctive black and white "piebald" patterning that resembles an Oreo cookie. This isopod is prized in the hobby for its striking appearance, hardiness, and rapid breeding rate, making it an excellent choice for beginners and a highly efficient clean-up crew for bioactive enclosures.
 
Appearance and Behavior
Appearance: This is a "pied" (patterned) form of the classic blue/grey wild type, with dark grey, sometimes almost black, patches contrasting against a white or pale background. The patterns are unique to each individual, and they possess the characteristic fine, powdery sheen of the species.
Size: They are a medium-sized isopod, typically reaching an adult length of 1 to 1.5 cm.
Behavior: 'Oreo Crumbles' are known for being active and social, often seen foraging on the substrate surface. They are fast-moving and use speed to escape when disturbed, rather than rolling into a ball. They are highly effective detritivores with a large appetite, making them great for breaking down waste. 
 
Husbandry and Care
P. pruinosus 'Oreo Crumble' are very adaptable and can tolerate a wide range of conditions, from arid to tropical, provided a moisture gradient is present. 
Habitat: A well-ventilated plastic or glass enclosure is suitable. A moisture gradient should be maintained, with a damp area (using sphagnum moss) and a drier side, allowing the isopods to regulate their moisture needs.
Temperature & Humidity: They thrive in standard room temperatures, ideally between 20–29°C (70–85°F). They are tolerant of a broad range of humidity but do best with access to a damp spot.
Diet: Their main diet should be an abundance of decaying organic matter.
Main diet: Decaying hardwood leaf litter (oak, beech, magnolia) and soft, rotting white wood.
Supplements: Offer protein-rich foods like fish flakes, freeze-dried shrimp or minnows, or a commercial isopod diet regularly (2-3 times per week) to prevent cannibalism and boost reproduction.
Calcium: A constant source of calcium (e.g., cuttlebone, crushed eggshells, or limestone) is vital for their exoskeleton health and successful molting.
Breeding: They are highly prolific breeders, with females potentially laying up to 400 eggs in their lifetime. They reach maturity and establish large colonies quickly in optimal conditions.