Taxonomy of Shellfish

5.1.5. Penaeus semisulcatus

Unit 5 -Key to important species the family Penaeidae

5.1.5. Penaeus semisulcatus - Green tiger prawn

• No lateral keels on carapace;
• Cutting portion of mandible short and massive;
• Rostrum toothed on dorsal, as well as on ventral margin, rostrum armed with 5 to 8 teeth on dorsal and 2 to 4 teeth on ventral margin,
• Adrostral crest and groove extending beyond epigastric tooth; postrostral crest almost reaching posterior margin of carapace, with a distinct median groove;
  
• Antennal crest very prominent, ending above posterior third of hepatic crest; gastro-orbital crest extending over posterior 2/3 of distance between hepatic spine and orbital margin;
  
• Hepatic crest straight, sloping anteroventrally;
• Fifth peropod with exopod.
• Petasma (in males) with distomedian projections reaching as far as costae; free border of ventral costae unarmed or minutely serrate near apex; outer surface of lateral lobes minutely tuberculate.
• Thelycum (in females) with lateral plates, their median margins forming tumid lips; anterior process with raised edges delimiting a depressed area; posterior process convex, partly inserted between lateral plates.