Dr. Murai Éva - Gubányi András szerk.: Parasitologia Hungarica 31. (Budapest, 1998)

4542 (mean 4495) by 296 to 347 (mean 337). Scolex 1093 long and 1089 in width, wider than neck. Suckers 243 to 257 by 232 to 265 (mean 249 by 251). Neck long and slender 484 wide and 863 long. Genital pores unilateral or alternating irregularly. Ventral osmoregulatory canals with transverse anastomosis; dorsal excretory canals simple, transverse anastomoses absent. Testes numerous, numbering 78 to 129 in several layers, situated mostly aporally to female glands; relatively many testes situated behind the aporal lateral excretory canals, few testes situated anteriorly and, some testes may overlap aporal and anterior lobes of ovary (Fig. 1). Cirrus sac pyriform, relatively long 94 to 117 (mean 108) by 225 to 258 (mean 242), never across and behind poral lateral excretory canals (Fig. 1). Internal seminal vesicle 86 to 113 (mean 101) by 94 to 139 (meanll6) and external seminal vesicle 40 to 66 (mean 53) by 410 to 503 (mean 466), tubular, covered by a layer of cells (Fig. 1). Cirrus with small spines. Vagina 48 to 76 (mean 56) by 223 to 267 (mean 241), open posteriorly to male pore, always shorter than cirrus sac, surrounded by thick cellular stripe, sleeve 71 to 267 in width, lumen 18 to 77 in diameter. Seminal receptacle big and long (291 to 373 by 847 to 949) cross-striking osmoregulatory canals (Fig. 1). Uterus at first aggregation of cells, transverse, dorsal, becoming later reticulate and developing anterior and posterior sacculations (Fig. 1). In gravid segments, uterus across and behind osmoregulatory canals bilaterally. Eggs 17.4-18.1 in diameter, oncospheres 4.6-5.0 in diameter. DISCUSSION The species Paranaplocephala genovi sp. n. is most related to the species Paranaplocephala aquatica Genov, Vasileva et Georgiev, 1996. The series of cestodes from Ondatra zibethicus were incorrectly determined by Tenora and Murai (1980) as Paranaplocephala ondatrae (Rausch, 1948) n. comb, and Genov et al. (1996) also included them incorrectly into the species P. aquatica Genov, Vasileva et Georgiev, 1996. Like us, Genov et al. (1996) were not fully persuaded about this determination, as it is obvious from a part of the text in their study, cited below: "They resemble closely the type-specimens of P. aquatica, apart from some metric characters: the width of the strobila and the sizes of the cirrus sac, seminal vesicles and seminal receptacle Therefore, with some reservation, we ascribe the specimens from the Czeh Republic and Hungary to P. aquatica." (cf. Genov et al. 1996, p. 143). We agree with the above-mentioned findings of Genov et al. (1996). After re-examining the specimens from the Czech Republic, other characters have also been found which can support the validity of Paranoplocephala genovi sp. n. A reletively long cirrus sac can be shown, which in P. genovi never extends (even partly) across and behind the lateral excretory canals (cf. Genov et al. 1996, Figs 9 and 10 versus Figs 3, 4 and 5). As well, ini? genovi relatively many testes were found behind the aporal lateral excretory canals and robust lateral ventral excretory canals as well as a conspicuously long seminal receptacle were observed (cf. Genov et al. 1996, Figs 9 and 10; Tenora and Murai 1980, Figs 33 and 34). The species Paranoplocephala genovi sp. n. is close to the species P. ondatrae (Rausch, 1948) nec Tenora et Murai, 1980. The species P. genovi sp. n. differs from the latter species described originally as Andrya ondatrae Rausch, 1948, by the different position of testes and ovary and the different characteristics of the seminal vesicle.