Ohtaka, A.; Martin, P. (2011). Redescriptions of Spirosperma apapillatus and Embolocephalus nikolskyi (Annelida, Clitellata, Tubificinae) from Japan, with Reference to Distribution of Papillate Tubificines in Japanese Freshwaters. Zoological Science. 28(5): 368.
Redescriptions of Spirosperma apapillatus and Embolocephalus nikolskyi (Annelida, Clitellata, Tubificinae) from Japan, with Reference to Distribution of Papillate Tubificines in Japanese Freshwaters