• Antennal peduncle not excluded from orbit
• posterolateral border of mercus of pereopod four to five with denticulation

• Antennal peduncle not excluded from orbit
• posterolateral border of merus of pereopod four to five without denticulations,carapace with one or two anterolateral teeth
• anterior frontal margin with strong median concavity,upper surface of palm of cheliped with only one pectinated crest, anterior border of merus of cheliped with subdistal triangular process distally denticulated

• Antennal peduncle not excluded from orbit
• posterodistal border of pereopod without denticulation
• but no anterolateral tooth on carapace
• upper palm of cheliped with two to three pectinated crest

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