The only sure way to tell an isopod from other similar crustaceans is that they have only one pair of uropods and lack strong clawed first thoracic legs. The carapace is lacking which reveals the segmented body composed of a head, a pereon (thorax) of 7 somites (segments) and a pleon (abdomen) of 6 somites. The last abdominal segment, to which the uropods are attached, is fused with the telson (or tail segment) to form a pleotelson. Each of the seven segments of the pereon has a pair of legs
from the last site that was linked. Maybe it is an isopod! Im pretty sure its a good one.