Redescriptions of Anonyx litoralis Kroyer, 1845 (type species of Onisi
mus Boeck, 1871 and Pseudalibrotus Delta Valle, 1893), Anonyx edwardsi
i Kroyer, 1846 (type species of Boeckosimus Barnard, 1969) and Parones
imus barentsi Stebbing, 1894 (type species of Paronesimus Stebbing, 18
94) show that these species are ail congeneric. Consequently, Pseudali
brotus becomes an objective junior synonym and Paronesimus and Boeckos
imus become subjective junior synonyms of Onisimus and all species cur
rently assigned to any of these three genera are provisionally assigne
d to Onisimus.