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      Expanded description of Neoechinorhynchus (Hebesoma) manubrianus (Acanthocephala: Neoechinorhynchidae) from marine fish in Halong Bay, Vietnam Translated title: Complément à la description de Neoechinorhynchus (Hebesoma) manubrianus (Acanthocephala: Neoechinorhynchidae) de poissons marins de la Baie d’Halong, Viêt-Nam

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          Abstract

          Neoechinorhynchus manubrianus Amin, Ha & Ha, 2011 (Acanthocephala: Neoechinorhynchidae) (formerly Neoechinorhynchus manubriensis Amin, Ha & Ha, 2011), was recently described based on optical microscopy of four males and two females (none was gravid) from caroun croaker, Johnius carouna (Cuvier), flower croaker, Nibea albiflora (Richardson), and silver croaker, Pennabia argentata (Houttuyen) (Sciaenidae) in Halong Bay, Vietnam. Subsequently, many more specimens became available from N. albiflora that were studied using SEM. SEM studies showed many additional features that were not possible to discern with optical microscopy. These included the prominent angulation of the anterior trunk, the presence of (1) anterio-dorsal and (2) undulating mid-lateral fin-like protrusions of the body wall, uniquely shaped eggs as well as details of trunk micropores, proboscis, bursa, and female gonopore. Microscopical examination of eggs from the new collection demonstrated the presence of polar prolongation of fertilization membrane which places N. manubriensis in the subgenus Hebesoma. The features of trunk angulation, trunk fins, and egg morphology further distinguish N. manubriensis from all other species of Neoechinorhynchus Stiles and Hassall, 1905 from Vietnam or from any where else in the world.

          Translated abstract

          Neoechinorhynchus manubrianus Amin, Ha et Ha, 2011 (Acanthocephala: Neoechinorhynchidae) (auparavant Neoechinorhynchus manubriensis Amin, Ha & Ha, 2011) a été décrit récemment en microscopie optique à partir de quatre males et deux femelles (non gravides) récoltés sur Johnius carouna (Cuvier), Nibea albiflora (Richardson) et Pennabia argentata Houttuyen) (Sciaenidae) de la Baie d’Halong, au Viêt-Nam. Par la suite, de nombreux autres spécimens de N. albiflora ont été étudiés en microscopie électronique à balayage (MEB). Ainsi, d’autres caractéristiques qu’il n’était pas possible de discerner en microscopie optique ont été rapportées. L’examen microscopique des oeufs de la nouvelle collection a montré la présence d’une prolongation polaire de la membrane de fertilisation, ce qui permet de situer N. manubriensis dans le sous-genre Hebesoma. L’angulation antérieure du tronc, les caractéristiques des nageoires et la morphologie des oeufs distinguent plus avant N. manubriensis de toute les autres espèces de Neoechinorhynchus Stiles et Hassall, 1905, du Viêt-Nam ou de toute autre région du monde.

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          Most cited references 3

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          Redescription of Rhadinorhynchus ornatus (Acanthocephala: Rhadinorhynchidae) from skipjack tuna, Katsuwonus pelamis, collected in the Pacific Ocean off South America, with special reference to new morphological features.

          Adults of Rhadinorhynchus ornatus Van Cleave, 1918 were collected from the small intestine of skipjack tuna, Katsuwonus pelamis (Linnaeus), in the high seas of the Pacific Ocean off the west coast of South America (new parasite locality record) and described using optical microscopy and a scanning electron microscope (SEM). Our specimens were somewhat comparable to those described from North America and Japan, but had more trunk spines. Definitive differences between the length and thickness of each of the dorsal and ventral proboscis hooks are noted for the first time, with most ventral middle hooks being relatively shorter and more robust than dorsal middle hooks. The SEM documented, for the first time, the different surface topography of the tegument in the proboscis, the neck, and in 3 trunk regions; the presence of microtrichs in the mid- and posterior trunk regions; the elevated base of trunk spines; the circular arrangement of basal proboscis hooks; the different morphology of all dorsal and ventral proboscis hooks and the striations of their surface; the ribbed surface topography of eggs; the elevated slit-like female gonopore; and the rimmed edge of the bursa. The presence of microtrichs on the tegumental surface is further supported by transmission electron microscopy studies. This is the first report of microtrichs in any species of Acanthocephala and the second report of striations in proboscis hooks. The geographical distribution of R. ornatus appears to correspond, at least in part, to that of its epipelagic primary host, K. pelamis, throughout the world in waters ranging in temperature from 14.7 to 30 C.
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            Revision of Neoechinorhynchus Stiles & Hassall, 1905 (Acanthocephala: Neoechinorhynchidae) with keys to 88 species in two subgenera.

             Omar M. Amin (2002)
            Neoechinorhynchus Stiles & Hassall, 1905 is revised based on both bibliographic studies and the examination of material. The evolution of the concept of the genus is discussed. The concept of Hebesoma Van Cleave, 1928 is also commented upon. The synonymy of the two genera is accepted, with Neoechinorhynchus having priority, and a new diagnosis for Neoechinorhynchus is provided. However, Hebesoma is recognised as a subgenus of Neoechinorhynchus, being differentiated from the nominal subgenus primarily on features of the egg. Of the 109 species studied, seven are transferred to other genera and 14 are considered invalid. Eleven species are assigned to the subgenus Hebesoma and 48 to the subgenus Neoechinorhynchus. Twenty-nine species were not assigned because of incomplete or absence of descriptions of adult females. Keys to assigned and non-assigned species are provided. Notes on the zoogeography of the 88 accepted species are also included.
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              First report of Neoechinorhynchus (Acanthocephala: Neoechinorhynchidae) from marine fish of the eastern seaboard of Vietnam, with the description of six new species

               O.M. Amin,  N.V. Ha,  D.N. Ha (2011)
              The occurrence of acanthocephalans of the genus Neoechinorhynchus Stiles and Hassall, 1905 in Vietnamese waters is reported for the first time. Six new species are described from seven species of marine fish of the families Belonidae, Clupeidae, Megalopidae, Mugilidae, and Sciaenidae, collected in Halong Bay of the eastern seaboard of Vietnam in 2008 and 2009. These are Neoechinorhynchus (Neoechinorhynchus) plaquensis n. sp. characterized by dermal plaques covering the entire trunk; Neoechinorhynchus manubriensis n. sp. with very long anterior proboscis hooks having roots with prominent anterior manubria and very small and equal middle and posterior hooks, two pseudoretractors in the receptacle, simple vagina, and terminal gonopore; Neoechinorhynchus pennahia n. sp. with equal anterior and middle proboscis and somewhat smaller posterior hooks, and terminal female gonopore; Neoechinorhynchus ampullata with many giant nuclei in the body wall and lemnisci and a parareceptacle structure complex which includes pumping ampullas reported for the first time; Neoechinorhynchus (Neoechinorhynchus) longinucleatus n. sp. with very long giant nuclei in the Lemnisci, anteriorly twisted vagina, and subterminal female gonopore. Neoechinorhynchus (Neoechinorhynchus) ascus n. sp. is the second species of Neoechinorhynchus found with the parareceptacle structure/ampulla complex. Neoechinorhynchus (Neoechinorhynchus) johnii Yamaguti, 1929 of Bilqees, 1972 is not N. johnii because of proboscis armature and other discrepancies with the Yamaguti material. Notes on host distribution and feeding habits are also included.
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                Author and article information

                Journal
                Parasite
                Parasite
                parasite
                Parasite : journal de la Société Française de Parasitologie
                EDP Sciences
                1252-607X
                1776-1042
                August 2012
                15 August 2012
                : 19
                : 3 ( publisher-idID: parasite/2012/03 )
                : 267-270
                Affiliations
                [1 ] Institute of Parasitic Diseases (IPD), 11445 E. Via Linda # 2-419 Scottsdale, Arizona 85259 USA
                [2 ] Department of Biology, Brigham Young University Provo, Utah 84602 USA
                Author notes
                [* ]Correspondence: Omar M. Amin. E-mail: omaramin@ 123456aol.com
                Article
                parasite2012193p267 10.1051/parasite/2012193267
                10.1051/parasite/2012193267
                3671446
                22910669
                © PRINCEPS Editions, Paris, 2012

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                Page count
                Figures: 3, Tables: 0, Equations: 0, References: 4, Pages: 4
                Categories
                Research Note

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