Enchytraeus durus (Eisen, 1878) accepted as Fridericia dura (Eisen, 1878) (new combination reference)
Enchytraeus lobifer Vejdovský, 1879 accepted as Fridericia lobifera (Vejdovský, 1879) accepted as Fridericia ratzeli (Eisen, 1872) (new combination reference)
Fridericia Michaelsen, 1889 (original description)
Henlea Michaelsen, 1889 (original description)
Marionia Michaelsen, 1889 accepted as Marionina Michaelsen in Pfeffer, 1890 (original description)
Marionina crassa (Claparède, 1861) accepted as Lumbricillus crassus (Claparède, 1861) (basis of record)
Neoenchytraeus ratzelii (Eisen, 1872) accepted as Fridericia ratzeli (Eisen, 1872) (new combination reference)
Pachydrilus affinis Czerniavsky, 1881 (status source)
Pachydrilus charkowiensis Czerniavsky, 1881 (status source)
Pachydrilus gracilis Czerniavsky, 1881 (status source)
Pachydrilus lacustris Czerniavsky, 1881 (status source)
Pachydrilus opacus Czerniavsky, 1881 (status source)
Pachydrilus proximus Czerniavsky, 1881 (status source)
Pachydrilus similis Czerniavsky, 1881 (status source)