 In "Synalpheus parneomeris", peak to peak source levels of 185–190 dB re 1 μPa at 1 m were measured, depending on the size of the claw.The only known eusocial aquatic species occur within the genus "Synalpheus".The species known to be eusocial are "S. brooksi", "S. chacei", "S. elizabethae", "S. filidigitus", "S. rathbunae", "S. regalis", "S. microneptunus", and "S. duffyi" as well as potentially "S. riosi".