BioStor
 | Oligochaeten des Naturhistorischen Museums in Hamburg. IV W Michaelsen (1890) Jahrbuch der Hamburgischen Wissenschaftlichen Anstalten 8: 299-340 |
 | Terricolen der Berliner Zoologischen Sammlung. II W Michaelsen (1892) Archiv für Naturgeschichte. Berlin 58: 209-261 |
 | THE FATE OF THE UNFERTILIZED EGG IN THE WHITE MOUSE Harry H Charlton (1917) Biol Bull 33: 321-338 |
 | BIFURCATION IN THE EMBRYOS OF TUBIFEX Paul S Welch (1921) Biol Bull 41: 188-202 |
 | Miscellanea Megadrilogica. V-VI G E Gates (1962) Proceedings of The Biological Society of Washington 75: 137-143 |
 | Requiem~for megadrile Utopias. A contribution toward the understanding of the earthworm fauna of North America G E Gates (1966) Proceedings of The Biological Society of Washington 79: 239-254 |
 | Contribution to knowledge of the oligochaete fauna (Annelida, Oligochaeta) from Argentina Catalina C De Mischis and Gilberto Righi (1999) Gayana 63(2): 63-65 |