Most Isopoda live in marine or freshwater habitats, e.g. Sea Slaters,
Water Slaters and Water Lice, but the Order also includes the only crustaceans, the Woodlice (Sub-order Oniscoidea), that have
properly invaded land, without the need to return to water in order to breed, although they tend to be restricted to fairly
damp places. Most Woodlice are flat oval creatures, with a grey or yellowish speckled back composed of 13 horny articulated
plates. The head is quite small with a pair of angled, S-shaped antennae. There are seven pairs of short translucent legs, and
a pair of very short caudal (or tail) appendages.