American Cockroach Nymph

Scientific Name: Periplaneta americana

Order & Family: Order: Blattodea; Family: Blattidae

Size: Nymphs vary from 6 mm to full size; adults can reach 35-40 mm (1.4-1.6 inches).

American Cockroach Nymph

Natural Habitat

Found in dark, moist, and warm areas such as basements, crawl spaces, sewers, and kitchens. They often move indoors from outdoors or drainage systems.

Diet & Feeding

Omnivorous and opportunistic scavengers; they eat organic decaying matter, crumbs, starches, glue, and fermented foods.

Behavior Patterns

Nocturnal and highly agile. They undergo incomplete metamorphosis (egg, nymph, adult). Nymphs molt several times, darkening in color as they age.

Risks & Benefits

High risk as a household pest. They carry various pathogens (like Salmonella and E. coli), trigger allergies and asthma, and contaminate food sources. No significant benefits in human environments, though they act as decomposers in nature.

Identified on: 3/2/2026