Holocephalocotyle monstrosae n. gen. n. sp. from Chimaera monstrosa. (A) Holotype, whole body (Ago, anterior gland duct openings; Ph, pharynx; Phg, pharyngeal glands; Ca, caecum; T, testis; Vi, vitellarium; Pl, peripheral loculus; Il, interperipheral loculus; Cl, central loculus; Mm, marginal membrane; An, anchor); (B) holotype, female reproductive system (Eg, egg; V, vaginae; Tvd, transverse vitelline duct; Sr, seminal receptacle; Cvd, common vitelline duct; Od, oviduct; Gj, glandular junction; Al, ascending limb of oötype; Dl, descending limb of oötype; Mg, Mehlis’ glands; Fi, filament; O, ovary); (C) holotype, male reproductive system, (testis not depicted [Sv, seminal vesicle; Ejb, ejaculatory bulb; Mco, male copulatory organ; Ic, internal chamber; Mag, male accessory glands; Vd, vas deferens]); (D) male copulatory organ; (E) egg; (F) anchors, variations according to different specimens; (G) uncinulus; (1–7) uncinuli.