Plesioastiotrema magniovum ( Fischthal & Kuntz, 1965 ) Karar & Blend & Dronen & Adel, 2023

Karar, Yasser F. M., Blend, Charles K., Dronen, Norman O. & Adel, Asmaa, 2023, Towards resolving the problematic status of the digenean genus Astiotrema Looss 1900: Taxa excluded from Astiotrema (sensu stricto) with special reference to plagiorchioid genera closely related to the restricted concept of Astiotrema, Zootaxa 5284 (3), pp. 445-495 : 450

Plesioastiotrema magniovum ( Fischthal & Kuntz, 1965) n. comb.

( Fig. 4 )

(Syn. Astiotrema magniovum Fischthal & Kuntz, 1965 )

Record. 1. Fischthal & Kuntz (1965).

Remarks. Plesioastiotrema magniovum n. comb. is similar to P. monticellii in most morphological characters except in having (i) roughly equally-sized suckers, (ii) more longitudinally-extended vitellarium distributed from a little anterior to the ovary to the level of the posterior margin of the anterior testis, (iii) longer ceca that terminate at the level of the end of the posterior testes, (iv) large, distinct, transversely elongated testes, (v) a submedian genital pore located at the anterosinistral margin of the ventral sucker and (iv) larger eggs (62–76 × 28–35 µm vs 22–31 × 11–14 [see Dollfus 1957]).

Figures

FIGURES 4 & 5. Plesioastiotrema magniovum (Fischthal & Kuntz, 1965) n. comb. and Homeoastiotrema turneri (Bray, Van Oosterhout, Blais & Cable, 2006) n. gen., n. comb. 4. P. magniovum (syn. Astiotrema magniovum Fischthal & Kuntz, 1965), ventral view, redrawn from Fischthal & Kuntz (1965, fig. 6). 5. H. turneri (syn. Astiotrema turneri Bray, Van Oosterhout, Blais & Cable, 2006), ventral view, redrawn from Bray et al. (2006, fig. 1). Abbreviations: AT, anterior testis; BS, body spines; Ce, cecum; CP, cirrus-pouch; Es, esophagus; GP, genital pore; LT, left testis; OS, oral sucker; Ov, ovary; Ph, pharynx; PP, pars prostatica; PT, posterior testis; RT, right testis; SR, seminal receptacle; SV, seminal vesicle; Ut, uterus; V-D, vas-deferens; VF, vitelline follicle; VS, ventral sucker. Scale bars: Fig. 4 = 1,000 µm; Fig. 5 = 500 µm.