and these genera share the presence of a prostomium
without lobes and glandular
ridges, four pairs of branchiae, absence of chaetae on segment II
(paleae), and absence of modified segments. However, the shape
of the prostomium here described for Paramytha gen. nov., being
rectangular with a thickened anterior margin is distinctly different
from the spade-like prostomium described for Orochi and Phyllocomus
.