Ophiotaenia tessellata sp. n. from Natrix tessellata, Egypt. (A) Scolex, dorsoventral view; (B) mature proglottis, dorsal view; (C) gravid proglottis, ventral view; (D) vagina and cirrus sac region, dorsal view. 

Abbreviations: ci, cirrus; cs, cirrus sac, do, dorsal osmoregulatory canal; mg, Mehlis’ gland, ov, ovary; te, testes; ud, uterine diverticula; up, uterine pore; ut, uterus; vd, vas deferens; vc, vaginal canal; vf, vitelline follicles; vo, ventral osmoregulatory canal; vs, vaginal sphincter. Scale-bars: A= 100 μm; B, C = 500μm; D= 250μm.