• No transverse ridge on carapace behind level of last anterolateral teeth
• First anterolateral tooth acuminate,not truncated on outer border
• Palm with five stout spines in all
• Sharp median lobule on lower border of orbit, no spine on posterior margin of carpus of natatory leg

• Posterior border of propodus of last leg serrated
• spine on posterior margin of carpus of natatory leg

• Cheliped covered with flat tubercles on upper surface, with scale like tubercles on lower surface
• two anterior teeth of anterolateral borders smaller than other and acuminate
• forntal teeth tops much rounded

• First tooth of anterolateral borders obliquely truncate on outer border
• Palm with four sharp spine in all
• Anterolateral teeth broad at base,first anterior lobe bifid
• three spine on anterior borders of arm
• a cross on the carapace

• Entire animal covered with downy fur
• last anterolateral tooth not larger than others
• frontal teeth acuminate
• generally armature sharp

• A transverse ridge on cardiac region, but none on posterior half of branchial region
• Carapace flat
• three spines on anterior border of arm,five on upper surface of hand

• Carapace not flat-convex
• two spines on anterior border of arm, three spines on hand,porpodus of chela characteristically drum shaped

• A transverse ridge on cardiac region and also two on posterior half of either branchial region
• Species of a small size ;
• first anterolateral tooth truncated and last one by far largest
• palm of cheliped not tuberculated,with four spines in all
• penultimate segment of male abdomen convex on outer border

• Species of a good size
• frontal teeth rounded at tip
• first and second anterolateral teeth truncate at tip,last one not larger than preceding one
• chelipeds tuberculated,palm with five teeth in all
• Dorsal surface of carapace uniformly covered with soft tomemtum
• penultimate segmnet of male abdomen not convex on lateral borders.
• under surface of palm unifromly covered with squamiform ridges, marked with longitudinal sulcus

• Penultimate segment of male abdomen convex on outer borders
• under surface of palm uniformly covered with squamiform ridges,no distinct longitudinal sulcus

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