''Sonatsa'' is a genus of marine, mud-dwelling polychaete worms containing the sole species ''Sonatsa meridionalis''. ''S. meridionalis'' was described in 1919 by Ralph Vary Chamberlin from a single specimen collected by the research ship USS ''Albatross'' during a 1904–05 survey of the southeast Pacific Ocean. The type specimen was collected between Peru and the Galapagos Islands, from muddy sediment at a depth of around 4 km. The name ''Sonatsa'' derives from the Goshute words ''soma,'' meaning "many", and ''natsani'', meaning "hook", while the specific name '' meridionalis'' is Latin for "southern".

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Animals described in 1919 Monotypic protostome genera Polychaete genera {{Annelid-stub