Portal:crustaceans Did You Know 18

... that the pill bug Armadillidium vulgare (pictured) can reach population densities of 10,000 per square metre?
... that the extinct crab Metacarcinus starri from Washington state is related to the graceful rock crab?
... that the extinct prawn Aciculopoda, described in 2010, is the third unambiguous fossil decapod from before the Mesozoic?
... that Mary J. Rathbun described over 1000 new crustacean taxa, but never attended college, and received a Ph.D. only after she retired?