Micrograph of Achaeta multisacculata sp. n. A Head pore dorsal view (marked with arrow) B Preclitellar nephridia at 8/9 (marked with arrow) C Last nephridia at 26/27 of paratype P.120.2, No. 2460 D Oesophageal appendages in V (marked with black arrow), meandering canal in IV (marked with white arrow) E–F Coelomocytes G Pygidium, the anal muscles well developed H–J Sperm funnels K–L Spermathecae of paratype NIBRIV0000813659, No. 2459 (the diverticulum-like dilation of ampulla marked with arrow in L) M Spermatheca of paratype P 120.3 slide No. 2478 (here the ental reservoir bent back into IV marked with arrow). B, D–E, G, I, J in vivo A, C, F, H, J–L fixed, stained. Scale bars: 50 μm, in H, I: 20 μm.