Sphaeromatoidea

Marine and estuarine environments, primarily intertidal and shallow subtidal zones. Some species inhabit brackish waters. Habitats include rocky shores, coral reefs, mangroves, seagrass beds, and soft sediments. Many species are found in sheltered, humid microhabitats under rocks, in crevices, or within decaying plant material.

Cosmopolitan in coastal marine waters worldwide. Highest diversity in tropical and temperate regions. Present in Atlantic, Pacific, and Indian Oceans, as well as Mediterranean and other marginal seas.

Conglobation (rolling into a ball) is a defensive behavior characteristic of many species. This behavior protects the ventral surface and appendages from predators and desiccation. Most species are slow-moving and remain concealed during daylight hours, becoming active at night.

Detritivores and scavengers in coastal marine ecosystems. Process decaying plant and animal matter, contributing to nutrient cycling. Serve as prey for fish, birds, and other invertebrates.

Some species are bioindicators of environmental quality in coastal habitats. Occasional pests in aquaculture facilities and marine infrastructure. No direct economic importance.

• OniscideaTerrestrial isopods (woodlice) that also conglobate, but distinguished by adaptations to land including pleopodal lungs and different antennal structure; Sphaeromatoidea are primarily marine.
• CymothooideaMarine isopod superfamily containing parasitic fish lice; distinguished by lack of conglobation ability and modified mouthparts for parasitism versus free-living detritivory in Sphaeromatoidea.

• crustacean
• isopod
• marine
• intertidal
• conglobation
• detritivore

• BugGuide
• iNaturalist taxon
• Catalogue of Life