1. Pereopods 5–7,dactylsnotretractile.Pereopod 5,anterodistalcornerofbasisnotproduced .......................................................................................... Archaeoscina Stebbing, 1904
Pereopods 5–7, dactyls wholly or partly retractile, sometimes hooded. Pereopod 5, anterodistal corner of basis produced sharply, overlapping most of ischium................. .......................................................................................... Paralanceola Barnard, 1930.