Dorsal surface roughened by microscopical puncture and not shining. Rostral plate rather pentagonal and deflexed, with a median longitudinal groove anteriorly, covering completely base of eyes. Cornea transverse and bilobed. Surface without carinae except for marginals on posterior third, which are prominently recurving dorsally and extending to cervical groove; a much smaller one on median part of posterior margin of carapace. Exposed thoracic somites with traces of median carina on the eighth and reduced submedian carinae on the sixth to eighth; intermediate carinae prominent; lateral process rounded anteriorly and subtruncated posteriorly. Abdomen with nine carinae on each of first five somites and six on the last; intermediate carina of fifth somite and submedian and lateral carinae of the sixth each with a spine. Telson with a prominent median carina which ends in a spine posteriorly; posterior margin with six sharp spines, submedian pair bearing each with movable tip. Dactylus of raptorial claw armed with three short spines.