Commensal-host
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Exosphaeroma
Spherical Isopods, marine pillbugs
Exosphaeroma is a genus of marine isopods in the family Sphaeromatidae, found in shallow ocean waters worldwide. The genus exhibits highest diversity in the Southern Hemisphere and is notably one of few sphaeromatid genera occurring in the southern reaches of the Southern Ocean. Recent taxonomic work has described new species from the northeastern Pacific, including one discovered in urban Los Angeles and another from 142-year-old Alaskan collections.