36–39 segments; twelve pairs of elytrae, progressively increasing in length, followed by smaller foliaceous lamellae posteriorly; surface smooth. Anterior margin of first pair of elytrae entire; lateral margins of elytrae 2–12 entire. Branchiae number 10 pairs (on segments 8, 10, 12 ... 22, 23, 25). Neuropodial ventral lamellae absent. Acicular neurochaetae absent on anterior segments; dorsal neurochaetae of posterior segments straight or slightly curved dorsally.
Known only from the Indian Ocean on the continental margin of Western Australia at about 22ºS at a depth of 206–211 metres.
Small specimens up to about 5 mm long, have 21–23 segments, 10–11 pairs of elytrae and a greater proportion of lateral elytral fimbriae with terminal buds or processes. They otherwise agree with the description here. Woolley & Wilson (2011) agreed with comments on juvenile characters in Grubeulepis by Pettibone (1969) who first suggested that these specimens are conspecific. Grubeulepis kurnai sp. nov. is most similar to G. geayi (Fauvel, 1918) but has 11 pairs of branchiae versus 13 pairs in G. geayi. Other differences are noted by Woolley & Wilson (2011).