- ... that symbiotic moss animals live on setae on the antennae, mouthparts and legs of the crab Goneplax rhomboides (pictured)?
- ... that Geograpsus severnsi is the first crab species known to have become extinct in historical times?
- ... that cycloids are believed to have been driven to extinction when crabs spread across their territory?
- ... that the fairy shrimp Branchinecta brushi lives at 5,930 m (19,460 ft) in the Chilean Andes, higher than any other crustacean in the world?