segments II–IV respectively; two anterior pairs in transverse row without median gap. Chaetae on segment II (paleae) absent.
Number of thoracic and abdominal chaetigers interspecifically
variable. Modified segments absent. Abdominal neuropodia gradually
increasing in size forming pinnules from about 4th
abdominal chaetiger. Anal cirri absent.
Four pairs of cirriform branchiae arranged as 2+1+1 on segments II–IV respectively