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''Pseudorhabdosynochus sulamericanus'' is a diplectanid monogenean parasitic on the gills of the Snowy grouper, ''Epinephelus niveatus'' and of the Warsaw grouper, ''Epinephelus nigritus''. It has been described by Santos, Buchmann & Gibson in 2000 and redescribed by Kritsky, Bakenhaster and Adams in 2015. 〔 〕 ==Description== ''Pseudorhabdosynochus sulamericanus'' is a small monogenean. The species has the general characteristics of other species of ''Pseudorhabdosynochus'', with a flat body and a posterior haptor, which is the organ by which the monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or "quadriloculate organ", has the shape of a bean with four internal chambers, as in other species of ''Pseudorhabdosynochus''.〔Kritsky, D. C. & Beverley-Burton, M. 1986: The status of ''Pseudorhabdosynochus'' Yamaguti, 1958, and ''Cycloplectanum'' Oliver, 1968 (Monogenea: Diplectanidae). Proceedings of the Biological Society of Washington, 99, 17-20. (PDF ) 〕 The vagina includes a sclerotized part, which is a complex structure. The description by Kritsky, Bakenhaster & Adams in 2015 includes the following: Body dorsoventrally flattened. Tegumental scales with rounded anterior margins extending from peduncle anteriorly into posterior trunk. Cephalic region broad, with terminal and two bilateral poorly developed lobes, three bilateral pairs of head organs, pair of bilateral groups of cephalic-gland cells at level of pharynx. Two pairs of eyespots lacking lenses immediately anterior to pharynx; one to all eyespots poorly defined, apparently replaced by dissociated chromatic granules; accessory chromatic granules small, irregular in outline, usually present in cephalic region. Pharynx subspherical to subovate; esophagus short to nonexistent; intestinal ceca blind, extending posteriorly to near peduncle. Peduncle broad. Haptor with dorsal and ventral anteromedial lobes containing respective squamodiscs and lateral lobes having hook pairs 2–4, 6, 7. Squamodiscs subequal, with 14–17 (usually 15) U-shaped rows of rodlets; innermost row teardrop shaped, closed. Ventral anchor with short superficial root, longer deep root having lateral swelling, slightly curved shaft, and recurved point extending just past level of tip of superficial root. Dorsal anchor with subtriangular base, superficial root short to lacking, short deep root, slightly arcing shaft, recurved point extending past level of tip of superficial root. Ventral bar with medial constriction, tapered ends, longitudinal medioventral groove. Paired dorsal bar with spatulate medial end. Hook with long slightly depressed thumb, delicate point, uniform shank; FH loop nearly shank length. Testis ovate, lying sinistroposterior to germarium along body midline; proximal vas deferens not observed; seminal vesicle a simple dilation of distal vas deferens, lying posterior to male copulatory organ; ejaculatory bulb and duct not observed; large vesicle (prostatic reservoir?) lying dextral to distal chamber of male copulatory organ. Male copulatory organquadriloculate, with thick walls, short distal cone, elongate tube, protruding filament variable in length. Germarium pyriform; germarial bulb lying diagonally at body midlength, with dorsoventral distal loop around right intestinal cecum; ootype lying to left of body midline, with well-developed Mehlis’ gland; uterus delicate, banana shaped when empty. Common genital pore ventral, dextral to MCO. Vaginal pore sinistroventral at level of distal end of male copulatory organ; vaginal vestibule delicate; vaginal sclerite complex, with distal flare, irregular tube with small proximal bulge and surrounded by variable small sclerites, and small chamber giving rise to delicate vaginal canal. Seminal receptacle subspherical, immediately proximal to vagina and anterior to ootype. Bilateral vitelline ducts not observed; vitellarium absent in regions of other reproductive organs, otherwise dense throughout trunk. 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pseudorhabdosynochus sulamericanus」の詳細全文を読む スポンサード リンク
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