|"Are you listening? This is important!"|
Unfortunately, I can't hear him.
Do underwater invertebrates communicate with sound at all? Fish and whales do, I know. Land-based insects do. Even slugs detect some sounds. How about crabs and shrimp? Hermit crabs?
Maybe they do.
Although marine invertebrates do not hear in the same way vertebrates do, it is thought they are able to sense vibrations and movements associated with sound production. Some marine invertebrates that produce sound in air have specialized sensory organs that can detect acoustic pressure changes in air. However, marine invertebrates in water are known to detect only particle motion. External sensory hairs and internal statocysts aid marine invertebrates in sound detection. (From Discovery of Sound in the Sea.)
There's always more to learn and be amazed by.