The rhinophores are smooth and slender and the rhinophore sheaths are only slightly expanded at the top. The cerata are elongate and inflated with two rows of tubercles and a larger rounded one at the tip. The background colour of the body is a dull yellow.
Originally described from the Azores, it has subsequently been recorded from various places in the western Mediterranean, and as far east as the Aegean Sea. Eat only Hydrozoa. (Aglaophenia spp.)