Epipodites present on 1st and 2nd pereopods

2nd pereopods with basial spines

Telson with pair of fixed subapical spines

Rostrum sigmoid-shaped, strongly upcurved and atleast distal half of free portion of rostrum unarmed

Distolateral projections of petasma slender, horn-like and straight, directed anterolaterally and with ventro-external openings

Distomedian projections small and curved ventrally

The anterior plate of thelycum square, concave with slender stem-like posterior process, posterior plate deeply notched anterolaterally

Epipodites absent on 1st and 2nd pereopod

2nd pereopods without basial spines, telson without fixed spines, cephalothorax has a prominent red spot on the dorsal side

Rostrum is sigmoid-shaped in females and young males, but in adult males, it is straight

The distolateral projections of petasma simply tapering to end, each with a long distomedian spine like processes

The anterior plate of thelycum wide and short, with curved anterior amrgin and with two longitudinal ridges, medially fused with the quadrate posterior plate.

Telson without fixed subapical spines, with or without lateral movable spines

1/3 pr less free portion of rostrum unarmed

Petasma with a pair of long slender horn-like distolateral projections, diverging proximally and curving inward distally, without small dorsal spiniform processes, distomedian projections extremely small

The anterior plate of thelycum subquardrate, posteriorly depressed and medially fused to posterior plate., the latter with a pair of lateral depressions and median boss

A median tuft of long setae (hairs) behind the thelycum

Petasma with a pair of distolateral projections directed laterally or distolaterally, short and spout like

Post rostral carina reaching almost to posterior border of carapace

Antennular flagella 0.4-0.6 length of carapace, movable lateral spines absent on telson

In males, petasma with long, rabbit ear-shaped distomedian projections, deeply concave ventrally, distolateral projections short, directed anterolaterally, proximolateral lobes very large, and curved dorsally

The thelycum with anterior plate distally rounded and broadly articulating with posterior plate, the latter with a median tubercle bearing a tuft of long setae

Antennular flagella 0.6 length of carapace or longer movable lateral spines present on telson

Petasma with distomedian projections wing-like, wider than long, their anterior margin often crenulate distolateral projections short and directed laterally, proximolateral lobes very large, curved dorsally

Thelycum with anterior plate concave, rounded anteriorly; posterior plate flat, with a pair of anterolateral tooth-like projections, anteromedian margin slightly convex and bearing transverse row of long setae

Epigastric spine absent

Anterior plate of thelycum with V-shaped posterior edge and two accessory ridges on anterior edges of posterior plate

Rostrum with proximal 1/3 rising from carapace, remainder more or less horizontal.

The disto-lateral projections are slender and downward