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This work consisted in studying the frequency of deformations of the attachment organ in specimens representing the family Diplozoidae, occurring in roach, common bream, and white bream from live different water bodies. These water bodies differed in morphometric parameters, levels of eutrophication, and character of their pollution. The presence of three types of deformation was stated. The most common were deformations of type II (morphological changes of clamps, such as sclerite deformation, incomplete sclerite separation or sclerites missing altogether in a clamp), while less frequent were those of types I (chaoges in the size of clamps not associated with the structural changes) and III (missing clamps in a set). Most frequently anomalies of the attachment organ were stated in polluted Łyna River, polluted Wulpińskie Lake, and in dystrophic Warniak Lake. Less frequent were anomalies in less eutrophied lakes Dgał Wielki and Ukiel. Also the prevalence values of those parasites were the highest in the polluted water bodies. The present study suppons believes of other authors, that both infection parameters of Diplozoidae affecting fishes and deformations of monogeneans' attachment apparatus can be treated as indicators of environmental pollution.
Twenty-three Alburnoides bipunctatus originating from three natural environments were examined. The following species of Monogenea were found and described: Gyrodactylus gracilihamatus Malmberg, 1964; G. hronosus Žitňan, 1964; G. alburnoidesi Chiriac, 1969; G. euzeti sp. n.; Gyrodactylus sp.; Octomacrum europaeum Roman et Bychovsky, 1956; and Paradiplozoon alburni Khotenovsky, 1982. All the species are noted for the first time in Poland. The differential diagnosis of G. euzeti sp. n. was performed on the basis of the comparison with G. laevis Malmberg, 1956 the species most similar to it a parasite of Phoxinus phoxinus.
The knowledge that entobdelline (capsalid) monogeneans formerly in Entobdella fall into two natural groupings provides the background to this paper. It is proposed to retain Entobdella for E. hippoglossi (type species), E. pngetensis and E. soleae from teleost flatfishes and to erect Neoentobdella gen. nov. for those parasites formerly in Entobdella but infecting elasmobranch flatfishes (mostly dasyatid stingrays but one report from a rhinobatid host). Neoentobdella diadema comb. nov. is designated type species for the new genus, which also includes N. apiocolpos comb, nov., N. australis comb, nov., N. bumpusii comb. nov. and two new species, N. natans sp. nov. and N. parvitesticulata sp. nov. from the dasyatid stingrays Pastinachus sephen and Hifnantura fai, respectively, caught off the Great Barrier Reef, Queensland, Australia. A prominent feature of all Neoentobdella species is the possession of anterior adhesive pads with transverse rays, resembling a diadem, but the close relationship between N. natans and N. parvitesticulata is underlined by the presence in both species of a muscular pad armed with microsclerites inside the genital atrium and elaborate fleshy lips and folds on the dorsal surface near the common genital opening. Adults of both species are also able to swim. The validity of Pseudoentobdella pacifica is confirmed. Entobdellinae Bychowsky, 1957 is revised to accommodate the recently established Listwcephalos, as well as the proposal of Neoentobdella.
Two new species of Sciadicleithrum are described from the gills of Neotropical cichlid fishes collected from Paraná River, Brazil. Sciadicleithrum satanopercae sp. nov. is described from the gills of Satanoperca pappaterra and differs from congeners by having a dorsal anchor with the distal portion complex and the inner margin with a “denticulum” between shaft and point. Sciadicleithrum joanae sp. nov. is described from the gills of Crenicichla niederleinii and C. britskii collected from Paraná River. Sciadicleithrum joanae sp. nov. differs from congeners by having a male copulatory organ comprising about half a clockwise loop and a vaginal pore “bulb-shaped”.
A blotched fantail ray, Taeniurops meyeni (Müller et Henle, 1841), was captured in New Caledonia, South Pacific, and kept in a tank for quarantine before exhibition at the Nouméa public aquarium. After 24 days, the ray exhibited a heavy infection with two species of skin monogeneans. A freshwater bath allowed the collection of 1,914 monogeneans, including 1,453 capsalids, Neoentobdella taiwanensis Whittington et Kearn, 2009, on the ventral surface, and 461 monocotylids, Dendromonocotyle pipinna Chisholm et Whittington, 2004, on the dorsal surface. More than 300 monogeneans were prepared on slides to allow precise measurements. Capsalids and monocotylids occupied about 6% and 0.2% of the total ventral and dorsal ray surfaces, respectively.
Calydiscoides limae sp. nov. is described from the nemipterid Pentapodus aureofasciatus Russell, 2001 caught along the barrier reef off New Caledonia, South Pacific. The new species is characterised by its male copulatory organ, with a distal blade and a lateral spur, and its female sclerotised organ, with a sphere and a thin tube. Its lamellodiscs always have 7 concentric lamellae, with the 3 internal lamellae complete and the 4 peripheral lamellae progressively less and less complete; measurements of the angles occupied by the lamellae in numerous specimens showed that the lamellodisc structure shows little variation among individuals.
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