The peristomium consists of one or two achaetous rings (Blake, 1996; Glasby, 2000; SolisWeiss et al., 2009).
Prostomium pointed, conical; single achaetous peristomial ring.
The mouth segment is long and achaetous but with two strong fluted and grooved palps in the joint with the 1st setiger.
The buccal segment is long and achaetous but with two strong fluted palps in the joint with the first setiger.
segments follow this ridge, each bearing a lateral pair of lamellate branchiae similar in size (although the first pair are slightly longer than the second pair).