Isopods are a type of non-insect arthropod, or crustacean. Most isopods live on land, however there are approximately 100 North American aquatic species, mostly belonging to the family Asellidae. They tend to be rather flat from top to bottom, not laterally. They often have mottled coloring. These are usually bottom dwelling sprawlers, found in shallow, freshwater habitats. Usually they are omnivores or detritivores. Asellus communis is sometimes used for fly fishing in slow water areas with lots of plant growth.
Collector / Gatherer
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Order: Not defined.
Family: The antennules (smaller of the two pairs of antennas) are well formed, not vestigial. Dorsal body segments 8–9 are small and inconspicuous, not well pronounced in as in Stenasellidae. The uropods (pair of forked, tail-like appendages) are present terminally not lateral or ventral.