b Fig. 4 Riggenbachiella amazonense n in Untangling convoluted taxonomy of Chambriella Rego, Chubb & Pavanelli, 1999 (Cestoda: Proteocephalidae), with erection of Riggenbachiella n. g. and the description of a new species from pimelodid catfishes in the Neotropical Region

b Fig. 4 Riggenbachiella amazonense n. sp. ex Phractocephalus hemioliopterus (A, C, E, H, I), Sorubimichthys planiceps (typehost; B, D, F, J) and Zungaro zungaro (G). A, Scolex, dorsoventral view (MHNH-PLAT 67054); B, Pregravid proglottis, ventral view (IPCAS C-749); C, Mature proglottis, ventral view (MHNH-PLAT 79199); D, Terminal genitalia, ventral view (IPCAS C-749); E, F, Cross-sections at level of cirrus-sac, detailed in F (MHNH-PLAT 22005, 94096); G, Cross-section, detail at posterior level of proglottis (MHNH-PLAT 19544); H, I, Cross-sections, detail at posterior and ovary levels of proglottides, respectively (MHNH-PLAT 22005); J, Eggs drawn from whole-mounted specimen (MHNH-PLAT 70835). Abbreviations: al, anterior sucker loculus; ci, cirrus; cs, cirrus-sac; do, dorsal osmoregulatory canal; em, bi-layered embryophore; gc, glandular cells; idc, internal sperm duct chambers; lm, internal longitudinal musculature; mg, Mehlis' gland; on, oncosphere; ov, ovary; pl, posterior sucker loculus; te, testes; ut, uterus; va, vas deferens; vi, vitelline follicles; vo, ventral osmoregulatory canal; vs, vaginal sphincter; vt, vitelloduct. Scale-bars: A, B, C, 500 lm; D, F, 100 lm; E, 250 lm; G, H, I, 50 lm; J, 20 lm