A record of the mysid Hemimysis lamornae mediterranea (Crustacea: Mysida) from the western Mediterranean, with a complete morphological description

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.