Euphrosinopsis ahearni sp. nov. (paratype NHMUK ANEA.2022.654, unless stated otherwise) A live image of paratype (NHMUK ANEA.2022.646), with eyespots (E) marked by arrows B preserved specimen in dorsolateral view C anterior end in dorsolateral view D detail of prostomium (specimen stained with Shirlastain) with palp (P) and lateral antennae (La) marked by arrows E two pairs of branched branchiae (Br), lateral cirrus (LC) and ventral cirrus (VC) of midbody chaetigers F dorsal cirrus (DC) and branchia (Br) of midbody chaetigers. Scale bars: 1 mm. Abbreviations: E – eyes, P – palps, La – lateral antennae, Br – branchiae, LC – lateral cirrus, VC – ventral cirrus, DC dorsal cirrus.