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      Descriptions of acanthocephalans, Cathayacanthus spinitruncatus (Rhadinorhynchidae) male and Pararhadinorhynchus magnus n. sp. (Diplosentidae), from marine fish of Vietnam, with notes on Heterosentis holospinus (Arhythmacanthidae) Translated title: Descriptions des acanthocéphales Cathayacanthus spinitruncatus (Rhadinorhynchidae) mâles et Pararhadinorhynchus magnus n. sp. (Diplosentidae) de poissons marins du Vietnam, et notes sur Heterosentis holospinus (Arhythmacanthidae)

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      Parasite
      EDP Sciences
      Acanthocephala, Cathayacanthus spinitruncatus, Pararhadinorhynchus magnus n. sp., Heterosentis holospinus, Marine fish, Vietnam

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          Abstract

          Males of Cathayacanthus spinitruncatus Amin, Heckmann & Ha, 2014 (Rhadinorhynchinae Lühe, 1912) are described for the first time from Leiognathus equulus in Hai Phong and Nha Trang and from pony fish Nuchequula flavaxilla in Quang Ninh in the Pacific waters of Vietnam. The male allotype status is designated. Males of C. spinitruncatus are smaller and have fewer and smaller proboscis hooks and trunk spines than females. The male reproductive structures are in the posterior fifth of the trunk and with 6 club-shaped cement glands gradually merging into 6 independent cement gland ducts. The proboscis receptacle is more than half as long as the trunk and with a cephalic ganglion at its anterior end. In females, the receptacle is only about one fifth the length of the trunk. Specimens described as Cathayacanthus bagarii Moravec & Sey, 1989 were shown to have been wrongly assigned to Cathayacanthus. Pararhadinorhynchus magnus n. sp. (Diplosentidae) is described from Scatophagus argus off Hai Phong in the Gulf of Tonkin. It is the third species of the genus and is readily distinguished from the Australian species by having a considerably larger trunk and male reproductive structures, and more proboscis hooks. X-ray microanalysis (EDAX) of intact and gallium-cut hooks of P. magnus showed high calcium and phosphate mainly in the central core. Specimens of Heterosentis holospinus Amin, Heckmann & Ha, 2011 (Arhythmacanthidae) are also reported from L. equulus off Quang Binh, new host and locality records.

          Translated abstract

          Les mâles de Cathayacanthus spinitruncatus Amin, Heckmann & Ha, 2014 (Rhadinorhynchinae Lühe, 1912) sont décrits pour la première fois chez Leiognathus equulus à Hai Phong et Nha Trang et chez Nuchequula flavaxilla à Quang Ninh dans les eaux du Pacifique au Vietnam. Le statut d’allotype mâle est désigné. Les mâles de C. spinitruncatus sont plus petits et ont des crochets du proboscis et des épines du tronc moins nombreux et plus petits que les femelles. Les structures reproductrices mâles sont dans le cinquième postérieur du tronc et ont 6 glandes cémentaires en forme de massue se fondant graduellement dans 6 conduits de glandes cémentaires indépendants. Le réceptacle du proboscis est plus long que la moitié du tronc et porte un ganglion céphalique à son extrémité antérieure. Chez les femelles, le réceptacle mesure seulement environ un cinquième de la longueur du tronc. Des spécimens décrits sous le nom de Cathayacanthus bagarii Moravec & Sey, 1989, ont été attribués à tort à Cathayacanthus. Pararhadinorhynchus magnus n. sp. (Diplosentidae) est décrit de Scatophagus argus au large de Hai Phong dans le golfe du Tonkin. Ceci est la troisième espèce du genre et on la distingue facilement des espèces australiennes par un tronc et des structures reproductives mâles considérablement plus grands, et de crochets plus nombreux sur le proboscis. La microanalyse aux rayons X (EDAX) des crochets intacts et coupés au gallium de P. magnus a révélé une teneur élevée en calcium et en phosphate, principalement dans le moyeu central. Des spécimens d’ Heterosentis holospinus Amin, Heckmann & Ha, 2011 (Arhythmacanthidae) sont également signalés chez L. equulus au large de Quang Binh, ce qui constitue un nouvel hôte et une nouvelle localité.

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          Acanthocephalans from fishes and amphibians in Vietnam, with descriptions of five new species

          Eight species of acanthocephalans are reported, and five are new. Specimens of Neoechinorhynchus (Hebesoma) manubrianus Amin, Ha & Ha, 2011 were similar to the original description. Neoechinorhynchus (Hebesoma) spiramuscularis n. sp. (Neoechinorhynchidae), from Xenocypris davidi, has a unique proboscis receptacle wrapped in a spiral muscular layer, and an undulating flask-shaped lemnisci, as well as double para-receptacle structures. Heterosentis mongcai n. sp. (Arhythmacanthidae), from Acreichthys sp., has a small fusiform trunk with an unarmed cone and anterior trunk spines, and a proboscis with two circles of rooted apical hooks and 3–4 circles of rooted posterior spines as well as a para-receptacle-like structure at the posterior end. The poorly known Filisoma indicum Van Cleave, 1928 is fully described and illustrated for the first time. Acanthocephalus parallelcementglandatus n. sp. (Echinorhynchidae), from Clarias batrachus, is distinguished from other species of Acanthocephalus by its small fusiform trunk and parallel tubular cement glands. Pseudoacanthocephalus coniformis n. sp. (Echinorhynchidae), from Hylarana sp., is distinguished from other species by having an anterior trunk collar and staggered prominent filiform cement glands, among other features. Cathayacanthus spinitruncatus n. sp. (Rhadinorhynchidae), from Leiognathus equulus, is distinguished from the only two known species of the genus by having a very long and slender proboscis with more than 50 hooks per row and a totally spined trunk. The generic diagnosis of Cathayacanthus Golvan, 1969 is emended. Rhadinorhynchus johnstoni Golvan, 1969 (Rhadinorhynchidae) perfectly fits the only complete description of that species from the Fiji Islands.
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            Fine structure and energy dispersive X-ray analysis (EDXA) of the proboscis hooks of Radinorynchus ornatus Van Cleave, 1918 (Rhadinorynchidae: Acanthocephala)

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              Chemical analysis of metals in Acanthocephalans using energy dispersive X-ray analysis (EDXA, XEDS) in conjunction with a scanning electron microscope (SEM)

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                Author and article information

                Journal
                Parasite
                Parasite
                parasite
                Parasite
                EDP Sciences
                1252-607X
                1776-1042
                2018
                23 July 2018
                : 25
                : ( publisher-idID: parasite/2018/01 )
                : 35
                Affiliations
                [1 ] Department of Parasitology, Institute of Ecology and Biological Resources (IEBR), Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Cau Giay Hanoi Vietnam
                [2 ] Institute of Parasitic Diseases 11445 E. Via Linda 2-419 Scottsdale Arizona 85259 USA
                [3 ] Department of Biology, Brigham Young University 1114 MLBM Provo UT 84602 USA
                Author notes
                [* ]Corresponding author: omaramin@ 123456aol.com
                Article
                parasite180037 10.1051/parasite/2018032
                10.1051/parasite/2018032
                6057740
                30040609
                2487f097-a7a9-499c-b7f1-125cfa58861b
                © N. Ha et al., published by EDP Sciences, 2018

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 07 March 2018
                : 07 June 2018
                Page count
                Figures: 6, Tables: 2, Equations: 0, References: 25, Pages: 12
                Categories
                Research Article

                acanthocephala,cathayacanthus spinitruncatus,pararhadinorhynchus magnus n. sp.,heterosentis holospinus,marine fish,vietnam

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