Third thoracic sternite produced posteriorly
Procurved tooth absent between bases of 1st pair of pleopods
Procurved tooth present between bases of first pair of pleopod
Inner margin of basis of third pereopods with a sharply pointed projection
Third and fourth thoracic sternites deeply channelled longitudinally
Inner margin of basis of third pereopods without a sharply pointed projection
Third and fourth thoracic sternites not channelled longitudinally