Carapace with 1 or more longitudinal carina on sides
Second pair of pereopods unequal, with atleast 7 articles in the carpus
The 3rd and 4th and 5th abdominal terga are produced as spines
Carapace without conspicuous longitudinal carina
Epipods present on atleast first 2 pairs
Third maxilliped with exopod
Posterior border amd 3rd abdominal tergum acutely produced into a sharp tooth that overlap the next tergum