Revision of the species confused with “Nereis falsa” de Quatrefages, 1866 (Annelida, Nereididae)

Nereis falsa de Quatrefages, 1866 has been regarded as a cosmopolitan species, and several species described from different localities have junior synonyms of N. falsa. The present study is an attempt to resolve the taxonomic confusion in falsa, which seems contain distinct due previous inappropriate synonymy, widely distributed Atlantic eastern Pacific Oceans. For this purpose, authors first propose resurrection synonymy with Hediste diversicolor that was concluded during 19th century but disregarded later. After fixation identity sensu stricto, re-evaluate proper status previously confused Type, topotype non-type specimens were examined; most are redescribed, others reinstated. splendida Grube, 1840 valid Mediterranean neotype proposed; it includes populations what currently Consequently, transferred Malmgren, 1867, some comments added for latter genus key also included. callaona Grube & Kröyer 1857, marginata Örsted 1857 riisei restricted tropical American shores all redescribed. pelagica lunulata Ehlers, 1901, formerly synonym by Fauvel (1941), redescribed elevated rank level. lucipeta 1908, Ehlers (1913) (1919), occidentalis Hartman, 1945 Furthermore, ambigua Treadwell, 1937, Monro (1933), deserves be Western Africa recorded newly mezianei sp. nov.