Body tubular or slightly flattened dorsoventrally;
hairs, if present, few and scattered; rostrum
absent or reduced to a small spine; carapace
subcylindrical or prismatic, laterally rounded or
straight, surface spiny and with a pair of large
frontal horns above eyes; antennae very long
and rather thick, whip-like or spear-like; legs
without true pincers and first pair (except in
Justitia) not or only slightly longer than the
following legs, but often somewhat more robust;
posterior half of tail fan soft and flexible.