Branchhiostegal spine present, situated on, or slightly behind, anterior margin of carapace
Endopod of first pleopod of male without well developed appendix interna
Fifth pair of peropods with transverse rows of hairs on distal part of posterior margin
Rostrum with an elevayed basal dorsal crest of tooth
Pleura of fifth abdominal segment rounded
Branchiostegal groove absent from carapace.
Most of distal parts of dorsal margins toothless save for small subdistal tooth, ventral margin with 2 to 6 teeth
Rostrum long and slender, with an elevated basal crest of 4 to 7 teeth over the eye.
Anterior margin of carapace below antennal spine unarmed
Branchiostegal spine absent
Dactylus of last 3 pairs of pereopods simple
Carpus of second pereopods distinctly longer than merus
Rostram with a distinct elevated basal crest.
Ventral margin of the rostrum with4 to 7 teeth
In adult male, carapace with spinules anteriorly, second pair of pereopods with a very short pubescence which is especially distinct on the movable finger.
Carapus shorter than propodus
Endopod of first pleopod of male bears rudimentary appendix interna.
Branchiostegal spine situated some distance below branchiostegal suture.
Lower rostral teeth 4 to 6
Rostrum with subterminal teeth
Dactylus of last 3 pairs of pereopods always shorter than propodus
Branchiostegal groove present on carapace.
Most of distal part of dorsal margin toothless, save for 1 or 2 subdistal teeth
Ventral margin with 6 to 10 teeth
Rostrum longer and slender with an elevated basal crest of 5 to 7 teeth over the eye
Dactylus of fifth pair of pereopods about 1/3 as long as propodus
Endopod of fifth pleopod of male bears no appendix interna
Branchiostegal spine situated very near to branchiostegal suture.
Lower rostral teeth 2 to 3
Rostrum with no subterminal teeth
The sisth abdominal segment is about 1.5 times as long as the fifth.
Carpus of second pereopods as long as or shorter than merus
Fifth legs are about the same length as the fourth
Fingers of 2nd legs of adult male with more than 4 teeth placed at regular intervals.
Sometimes restricted to the proximal part, teeth are generally of equal size, but one of the proximal teeth may sometimes be longer
Fingers with valvetty pubescence in their basal portion
Dorsal teeth of the rostrum beginning in the distal third of the carapace
Rostrum without a distinct elevated basal crest
Fingers of the large chela of the adult male at most with 1 or 2 teeth in the proximal part of the cutting edges
The rest of the cutting edge entire
4-6 teeth of the dorsal margin of the rostrum behind the orbit
Carpus of the second leg of adult males longer than chela
Second leg of male without tubercles at each side of cutting edge
Rostrum with 9 to 11 dorsal teeth, 3 of which generally are placed behind the orbit
Rostrum with 12 to 15 dorsal teeth, 2 of which generally are placed behind the orbit