Genus Eupolymnia Verrill, 1900

Type species: Terebella danielsseni Malmgren, 1866 accepted as Eupolymnia nesidensis (Delle Chiaje, 1828) (type by typification of replaced name)

Diagnosis (after Hutchings et al. 2021).

Transverse prostomium attached to dorsal surface of upper lip; basal part as thick crest, eye spots usually present; distal part shelf-like. Buccal tentacles all uniformly cylindrical. Peristomium restricted to lips; lips expanded, relatively short upper lip, hood-like, wider than long, distal margin rounded, frequently undulated; button-like, mid-ventral lower lip, almost completely covered by lobes of segment 1. Segment 1 conspicuous all around, dorsally narrow, with pair of low ventro-lateral lobes connected to each other by mid-ventral lobe marginal to mouth. Segments 2–4 with pairs of progressively shorter and more laterally inserted lobes, those on segment 2 ventro-lateral and frequently connected to each other by low collar-like lobe across ventrum. Anterior segments highly glandular ventrally, with discrete rectangular shields, anterior shields frequently corrugated. Three pairs of branchiae, on segments 2–4, each with single short and thick main stalk, dichotomously branching to short distal filaments. Conical to roughly rectangular notopodia beginning on segment 4, extending 17 segments, until segment 20; notochaetae all narrowly-winged, wings slightly broader basally on one side. Neuropodia beginning on segment 5, as low, sessile ridges in conjunction with notopodia and conical to rectangular pinnules posteriorly; neurochaetae as short-handled avicular uncini, in completely intercalated double rows from segment 11 until termination of notopodia. Nephridial and genital papillae present, from segments 2 or 3, extending for few anterior segments, between parapodial lobes or equivalent position on anterior segments. Pygidium crenulate to papillate.