isopodiform

from The Century Dictionary.

• Formed like an isopod; resembling an isopod in form: specifically applied to six-footed, oblong, flattened larvæ with a distinct thoracic shield, long antennæ, and caudal bristles or plates, as those of the roaches.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Zoöl.) Having the shape of an isopod; -- said of the larvæ of certain insects.