All crustacea have two pairs of antennae on the head. Crustaceans include crabs, woodlice (pill bugs), lobsters, crayfish, and shrimp.
crayfish |
wood lice (isopods) |
beach fleas (amphipods) |
Freshwater Crayfish George W. Robinson © 1999 California Academy of Sciences |
Roly-poly; Pillbug © 2004 Joyce Gross |
More information about Molluscs |