The caridean shrimp species Lebbeus armatus (Owen, 1839) (Thoridae), originally described from Kamchatka, is reinstated from the synonymy of L. groenlandicus (Fabricius, 1775) and redescribed. It is easily distinguished from L. groenlandicus by having dense covering of short setae on the carapace and lateral parts of the pleon (versus only sparse setae are present), the clearly delimited branch...

Setae are vital in grooming activities and aiding in the removal of epibionts and sedimentary fouling from the body surfaces of decapod crustaceans. Thus, the setal structures and their arrangement on the grooming appendages and sensory structures of the commercially important shrimp, Macrobrachium rosenbergii, were examined using scanning electron microscopy. Macrobrachium rosenbergii is exten...