A new suprabenthic mysid, Mysidopsis cachuchoensis sp. nov., is described from specimens sampled with a suprabenthic sled at the ‘Le Danois' Bank (the ‘El Cachucho' Marine Protected Area; southern Bay of Biscay). The main distinguishing features of this new species are the structure of its eyestalk and antennal scale as well as the armature of its telson and uropodal endopods. Inferred from the present unique record (828 m depth, inner basin between the bank and the Cantabrian shelf), it seems to be a rare endemic species of the bank, living on muddy bottoms of the upper bathyal.

The mysid Hemimysis lamornae mediterranea Bacescu, 1936 is described from specimens sampled in the Ebro Delta, Spain, north-western Mediterranean. To date, this subspecies was only known from the Gulf of Naples and Marseille; this is the first record of the H. lamornae mediterranea on the Iberian Peninsula coast. Hemimysis lamornae mediterranea is distinguishable from its closest congeners, H. lamornae typica (Couch, 1856) and H. lamornae pontica (Czerniavsky, 1882) by the number of setae, the shape of the maxilla, and the relatively smaller number of spines on the uropod endopod and on the lateral margin of the telson.