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Microphotographs in vivo (a–e) and line drawings (f–h) of Diphterostomum flavum n. sp. (Zoogonidae) parasitizing the fish Pinguipes brasilianus on the Patagonian coast, Argentina: (a) anterior end of cercaria from the gastropod Buccinanops deformis, ducts of penetration glands ending in the oral sucker (arrows), (b) metacercariae naturally encysted in a parapodium of the polychaete Kinbergonuphis dorsalis, (c) metacercariae excysted at laboratory condition, (d) adult from the fish Pinguipes brasilianus with everted cirrus, (e) cirrus sac, (f) adult ventral view, (g) cirrus sac, (h) female genitalia. Abbreviations: c, caeca; cs, cirrus sac; e, egg; gp, genital pore; m, metraterm; o, ovary; ov, oviduct; os, oral sucker; pc, prostatic cells; pp, pars prostatica; rs, seminal receptacle; sc, spinous cirrus; sv, seminal vesicle; t, testis; u, uterus; vg, vitelline glands; vs, vental sucker. Scales: 20 μm (a, e, h), 50 μm (c, g), 100 μm (b, d, f).

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