A new monogenean species Neoheterobothrium hippoglossini sp. n. from the gill cavity of Hippoglossina stomata Steindachner, 1876 is described and illustrated. The new species differs from its seven congeners in a number of morphological features and in having a different host. The validity of the genus Neoheterobothrium is discussed. Neoheterobothrium mcdonaldi Payne, 1987 is relegated from the genus and from the subfamily Choricotylinae and placed in one of the remaining subfamilies of the family Diclidophoridae.
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W jamie skrzelowej soli wielkogębowej Hippoglossina stomata Steindachner, 1876 złowionej w Pacyfiku, przy brzegu w okolicy miejscowości Huntington Beach znaleziono pięć osobników przywry monogenetycznej. Szczegółowe badania morfologiczne wykazały, że znaleziony pasożyt reprezentuje rodzaj Neoheterobothrium Price, 1943. Badane osobniki różniły się pod względem niektórych cech morfologicznych od innych gatunków należących do tego rodzaju, dlatego też autorzy zdecydowali się uznać go za nowy gatunek, nadając mu nazwę Neoheterobothrium hippo- glossini sp. n. Niniejsza praca zawiera dyskusję dotyczącą rodzaju Neoheterobothrium. W wyniku tej dyskusji Neoheterobothrium mcdonaldi Payne, 1987, został usunięty z rodzaju oraz podrodziny Choricotylinae dojednej z pozostałych podrodzin rodziny Diclidophoridae.
Background. Monogenean parasites from mixohaline areas of the South Atlantic coast of Argentina are very poorly reported. The aim of this paper is report a new host and locality for Absonifibula bychowskyi, a monogenean confined to fish living in estuarine areas. Some ecological considerations about the host-parasite relationship are also discussed. Materials and Methods. Parasites collected from whitemouth croaker, Micropogonias furnieri (Desmarest, 1823) (Actinopterygii: Sciaenidae), were studied from fixed- and live specimens, with standard procedures used in parasitology. Prevalence, mean intensity, and abundance of parasites were calculated and related to the host body size. Spearman′s rank correlation coefficient was calculated to determine possible correlations between host length, parasite intensity, and prevalence. Results. Absonifibula bychowskyi (Monogenea: Diclidophoridae) Lawler et Overstreet, 1976 is reported for the first time from the gills of whitemouth croaker, at the Samborombón Bay, a mixohaline area in the Buenos Aires Province, Southwest Atlantic Ocean. The parasite was found only in juveniles of M. furnieri that use the Samborombón Bay as the main estuarine nursery ground area. When the croaker migrated seawards, A. bychowskyi disappeared from the gills may be related to the increased salinity. Conclusion. This is the first record for Absonifibula bychowskyi in the Southwest Atlantic and M. furnieri. (It constitutes a new host record.) The presence of A. bychowskyi in M. furnieri could be indicative of the origin of the fish.
Diclidophoroides maccallumi Price, 1943 and Neoheterobothrium paralichthyi sp. n. were collected from the gills of Urophysis brasiliensis (Gadiformes) and Paralichthys patagonicus (Pleuronectiformes) respectively in the southwestern Atlantic Ocean. The similarities and differences among the genera Neoheterobothrium Price, 1943, Choricotyle van Beneden et Hesse, 1863, Heterobothrium Cerfontaine, 1895 and Orbocotyle Euzet et Suriano, 1975 are discussed. The species and genera belonging to the family Diclidophoridae Cerfontaine, 1895 from the southwestern Atlantic Ocean are listed, and the distribution ranges of Diclidophoroides and Neoheterobothrium are extended to this region.
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