Ophiotaenia tessellata sp. n. from Natrix tessellata, Egypt. (A) Mature proglottis, transverse section at ovarian level; (B) cross-section of gravid proglottis, at level of anterior part; (C) eggs drawn after examination in distilled water. Abbreviations: do, dorsal osmoregulatory canal; dp, digitiform projections; em, embryophore; lm, internal longitudinal musculature; ln, longitudinal lateral nerves; mg, Mehlis’ gland; oe, outer envelope; om, oncospheral membrane; on, oncosphere; ov, ovary; te, testes; ut, uterus; vd, vitelline duct; vf, vitelline follicles; vo, ventral osmoregulatory canal. Scale-bars: A= 500μm; B= 250μm; C= 50μm.