Histological section of Archigetes loculotruncatus n. sp. from Ictiobus niger (Rafinesque) (US 244b, IPCAS C-903/3), Chotard Lake near Vicksburg, Mississippi, USA. A – sagittal section of scolex; B, C – longitudinal sections of scolex; D – cross section of middle portion of body; E – sagittal section of genital pores. Abbreviations: cga – common genital atrium, cs – cirrus-sac, esv – external seminal vesicle, fgp – female gonopore, ilm – inner longitudinal muscles, mgp – male gonopore, orc – osmoregulatory canals, te – testes, ut – uterus, vd – vas deferens, vf – vitelline follicles.