Abstract
Based on type material and additional specimens, the revision presented here comprises all Harmothoe and Lagisca species known to occur in the Mediterranean Sea. The following 16 Harmothoe species are considered to be valid and an identification key is provided; seven of them (marked by *) represent new records for the Mediterranean: Harmothoe antilopes McIntosh, 1876; H. areolata (Grube, 1860); *H. aspera (Hansen, 1879); H. extenuata (Grube, 1840); *H. fragilis Moore, 1910; H. fraserthomsoni McIntosh, 1897; *H. gilchristi Day, 1960; *H. goreensis Augener, 1918; H. imbricata (Linnaeus, 1767); H. impar (Johnston, 1839); *H. lagiscoides serrata Day, 1963; H. longisetis (Grube, 1863); *H. pagenstecheri Michaelsen, 1896; *H. pokoui Intes and Le Loeuff, 1975; H. spinifera (Ehlers, 1864); one new species, H. bellani, is described. Harmothoe notochaetosa Ló