Аннотация:The species described by Perejaslavzeva (1891) has a strange history. Since it has been described, Jacubova (1930) regarded it
as variety of Nephtys cirrosa Ehlers, 1868 without any explanation. Hartman (1959) wrongly listed it as Nephtys cirrosa longicornis
Jakubova, 1930. WoRMS (2015) follows her and does not even mention its author — Perejaslavzeva. On the other hand Vinogradov
(1949) and Vinogradov and Losovskaya (1968) accepted Nephtys longicornis as a distinct species. Marinov (1977) and Kisseleva
(2004) supposed that it is a synonym of Micronephthys stammeri (Augener, 1932). Our investigation of specimens from the Black
Sea (type locality) shows that there is no difference between Nephtys longicornis and Micronephthys stammeri, and last species
should be accepted as junior synonym. The redescription of Nephtys longicornis based on specimens from the Black Sea (type
locality) is given.