All isopods lack a carapace and their head is fused with the first thoracic segment. They have seven pairs of uniramous limbs, and compound eyes.
Isopods show a wide range of feeding strategies, from herbivorous/omnivorous, scavengers, detritovores to direct plant eaters. Some are even parasitic, feeding off their host's tissue fluids.
Below is a picture of one of the most familiar isopods, the common woodlouse.