Lawn Shrimp
Scientific Name: Arcitalitrus dorrieni (though other species of lawn shrimp exist, this is a common one)
Order & Family: Amphipoda (Order) / Talitridae (Family)
Size: Typically 10-20 mm (0.4-0.8 inches) in length.
Natural Habitat
Damp, cool, and dark environments, often found in gardens, under logs, leaf litter, mulch, and in basements or crawl spaces. They thrive in high humidity.
Diet & Feeding
Mainly decaying organic matter, leaf litter, fungi, and algae. They are detritivores and decomposers.
Behavior Patterns
Lawn shrimp are nocturnal, emerging at night to feed and mate. During the day, they remain hidden in damp, cool places. They are detritivores, meaning they play a role in decomposition by consuming decaying organic matter. They reproduce sexually, and females lay eggs in moist environments.
Risks & Benefits
Generally harmless to humans and pets, but can be considered a nuisance pest if found in large numbers indoors, particularly in damp areas like basements. They do not bite or transmit diseases. Ecologically, they are beneficial as decomposers, helping to break down organic matter and recycle nutrients in the soil.
Identified on: 8/31/2025