Histological section of Archigetes megacephalus n. sp. from Ictiobus cyprinellus (Valenciennes) (US 242a, IPCAS C-904/1, PBI-462), Chotard Lake near Vicksburg, Mississippi, USA. A – longitudinal section of body (total view); B – longitudinal section of scolex; D – longitudinal section of posterior part of body. Abbreviations: dlvf – dorsolateral vitelline follicles, cs – cirrus-sac, esv – external seminal vesicle, ilm – inner longitudinal muscles, ov – ovary, povf – postovarian vitelline follicles, te – testes, ut – uterus, vf – vitelline follicles.