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.