Superfamily Oplophoroidea Dana, 1852

Diagnosis (after Chace 1986, amended): Rostrum immovably attached to carapace; antennular flagella simple, without accessory branches; mandible with palp, molar and incisor processes not deeply separated; third maxilliped elongate, five-segmented, with well-developed exopod; all pereopods with well-developed exopod, pereopods 1–3 with strap-like epipod, pereopods 1 and 2 with well-developed chela and undivided carpus, pereopods 3–5 moderately long, carpus shorter than propodus; pleopods bearing appendices interna.