Diagnosis. Rostrum armed with a prominent spine in the anteroventral margin of rostrum; valves with six to 39 growth lines; umbones small and anterior lylocated; second antenna with 14–15 segments; telson with 18–25 spines.
Diagnosis. Rostrum armed with a prominent spine in the anteroventral margin of rostrum; valves with six to 39 growth lines; umbones small and anterior lylocated; second antenna with 14–15 segments; telsonwith 18–25 spines.