Snapping social swimmers

The snapping shrimp, Synalpheus regalis, lives in colonies with a single reproductive female, in the internal canals of sponges on Caribbean coral reefs. Most members function as non-reproductive workers who protect and defend their sponge against intruders. The shrimps have a snapping major fighting claw which is as effective as the sting in Hymenoptera. Males and females are however diploid in contrast to Hymenoptera in which males are haploid. Cavities appear to favor sociality by keeping relatives together.