Key to species of Paralebbeus

1. Rostrum dorsally armed................................................................................ 2

– Rostrum dorsally unarmed.............................................................................. 3

2. Rostrum with 1 ventral spine. Pereopods 3–5 merus unarmed............................................ P. mollis

– Rostrum with 2 ventral spines. Pereopods 3–5 merus with 1 or 2 movable distolateral spines............ P. pegasus sp. nov.

3. Carapace anterolateral margin between antennal spine and pterygostomial spine almost straight, without U-shaped concavity below antennal spine....................................................................... P. zotheculatus

– Carapace anterolateral margin between antennal spine and pterygostomial spine distinctly convex, with U-shaped concavity below antennal spine.................................................................................. 4

4. Rostrum ventrally unarmed. Supraorbital spine vestigial or absent. Pereopod 2 merus reaching anteriorly as far as base of antennal scale...................................................................................... P. zygius

– Rostrum with distoventral spine. Supraorbital spine well-developed. Pereopod 2 merus reaching anteriorly beyond midlength of antennal scale.............................................................................. P. jiaolongi