Body rather broad, anteriorly and posteriorly tapered. Prostomium triangular, about as long as wide or wider. Median antenna of similar size and shape as paired ones, situated on a line drawn between anterior margin of eyes. Proboscis almost smooth, with sparsely distributed minute papillae (usually not discernible on preserved specimens), arranged in more or less distinct rows. Terminal ring of 16-22 papillae. Tentacular cirri of segment 1 reaching about segment 5. Dorsal tentacular cirri of segments 2 and 3 reaching about segment 9. Ventral tentacular cirri reaching about segment 6, with chaetae arising from anterior side of the cirrophores. Dorsal cirri of median segments heartshaped, distally pointed, as long as broad or broader. Parapodial lobes slightly bilobed, with a large number of chaetae. Terminal end of chaetal shaft with few, rather large teeth. Blades long and slender. Ventral cirri heart-shaped, distally pointed, longer than broad. Pygidial cirri cylindrical, about 8-9 times as long as broad (E. bahusiensis-detail).
Up to 40 mm for 100 segments.
Living animals with dark green pigmentation on the prostomium anterior to eyes, and forming distinct bands across the dorsum. White iridescent pigment present dorsally on posterior part of prostomium, on segment 2, and often forming thin bands across the other segments. Eyes clear red. Green pigmentation retained in preserved animals to a varying degree, turning to brown after some time in alcohol.
Mud and sand; 10-135 m.
Ireland, North Sea, Kattegat, Skagerrak, Öresund.
Smaller specimens may be difficult to separate from Eumida sanguinea and Eumida ockelmanni , the characteristic shape of dorsal and ventral cirri not being well developed. Differences in pigmentation may be used for separating E. bahusiensis from E. sanguinea , and the absence of median pygidial papilla separates it from E. ockelmanni .