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      Neoandracantha peruensis n. gen. n. sp. (Acanthocephala, Polymorphidae) described from cystacanths infecting the ghost crab Ocypode gaudichaudii on the Peruvian coast Translated title: Neoandracantha peruensis n. gen. n. sp. (Acanthocephala, Polymorphidae) décrit à partir de cystacanthes infectant le crabe Ocypode guadichaudii de la côte péruvienne

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      Parasite

      EDP Sciences

      Neoandracantha peruensis n. gen. n. sp, description, EDAX analysis, Ocypode gaudichaudii, Peru coast

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          Abstract

          The cystacanths of Neoandracantha peruensis n. gen. n. sp. are described from the ghost crab Ocypode gaudichaudii collected from the Pacific coast of Peru. While it is uncommon to describe acanthocephalan taxa from immature stages, the presence of clear-cut distinguishing features separating the present material from its nearest congeneric taxa, and the absence of adults, justifies the erection N. peruensis. The new genus is distinguished by having three separate fields of trunk spines. Specimens of N. peruensis have a slender trunk with two anterior swellings, 3 separate fields of spines on the foretrunk swelling, and no genital spines on the hindtrunk. The proboscis of the new species is heavily armored with 21–22 longitudinal rows of 22 hooks each. Hook no. 14 is more robust ventrally than dorsally. Cystacanths of N. peruensis also have a long tubular hindtrunk and the males have diagonal testes in the midtrunk swelling. Specimens of the closely related Andracantha Schmidt, 1975 have anteriorly enlarged pear-shaped Corynosoma-like trunks, only two fields of anterior trunk spines with occasional genital spines, and bilateral or tandem testes. Proboscides of species of Andracantha have considerably fewer hooks that gradually decrease in size posteriorly. The taxonomic component of this work is amplified by metal analysis of hooks and spines that shows a marked amount of magnesium (Mg) in hooks but not in spines. The highest level of sulfur (S) was found in the outer layer of hooks and anterior spines. The metal footprint of hooks and spines varies in different species of acanthocephalans and has an interspecific diagnostic value.

          Translated abstract

          Les cystacanthes de Neoandracantha peruensis n. gen. n. sp. sont décrits à partir de spécimens du crabe Ocypode guadichaudi recueillis sur la côte Pacifique au Pérou. Bien qu'il soit rare de décrire les taxons d'Acanthocéphales à partir de stades immatures, la présence de caractéristiques distinctives séparant clairement ce matériel de ses taxons congénères les plus proches, en l'absence d'adultes, justifie l'érection de N. peruensis. Le nouveau genre se distingue par l'existence de trois champs distincts d'épines sur le tronc. Les spécimens de N. peruensis ont un tronc mince avec deux renflements antérieurs, 3 champs d'épines séparés sur le renflement à l'avant du tronc et pas d'épines génitales sur l'arrière du tronc. Le proboscis de la nouvelle espèce est lourdement armé avec 21 à 22 lignes longitudinales de 22 crochets chacun. Le crochet numéro 14 est plus robuste ventralement que dorsalement. Les cystacanthes de N. peruensis ont également un tronc long et tubulaire et les mâles ont des testicules diagonaux dans le renflement du milieu du tronc. Les spécimens du genre proche Andracantha Schmidt, 1975 ont un tronc élargi à l'avant en forme de poire comme Corynosoma, seulement deux champs d'épines sur le tronc antérieur avec des épines génitales occasionnelles et des testicules bilatéraux ou en tandem. Les proboscis des espèces d' Andracantha ont beaucoup moins de crochets, qui diminuent graduellement en taille à l'arrière. La composante taxonomique de ce travail est renforcée par l'analyse des métaux des crochets et des épines, qui montre une quantité marquée de magnésium (Mg) dans les crochets mais pas les épines. Le plus haut niveau de soufre (S) a été trouvé dans la couche externe des crochets et des épines antérieures. L'empreinte métallique des crochets et des épines varie selon les différentes espèces d'Acanthocéphales et a une valeur diagnostique interspécifique.

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          Most cited references 28

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          Fine structure and energy dispersive X-ray analysis (EDXA) of the proboscis hooks of Rhadinorynchus ornatus, Van Cleave 1918 (Rhadinorynchidae: Acanthocephala)

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            Profilicollis novaezelandensis n. sp. (Polymorphidae) and two other acanthocephalan parasites from shore birds (Haematopodidae and Scolopacidae) in New Zealand, with records of two species in intertidal crabs (Decapoda: Grapsidae and Ocypodidae).

            Profilicollis novaezelandensis n. sp. (Acanthocephala: Polymorphidae) is described from the South Island pied oystercatcher Haematopus ostralegus finschi Martens (Haematopodidae) and the intertidal crab Hemigrapsus crenulatus (Milne Edwards) (Brachyura: Grapsidae) from the South Island of New Zealand. The new species can be distinguished from all the other species of the genus by a combination of the following characters: long neck (13% of total body length for adults) and a subspherical proboscis with 14-16 longitudinal rows of 7-8 hooks. The mud crabs Helice crassa Dana (Grapsidae) and Macrophthalmus hirtipes (Heller) (Ocypodidae) were also harbouring cystacanths and the bar-tailed godwit Limosa lapponica (Linnaeus) (Scolopacidae) juveniles of P. novaezelandensis. This is the first record of brachyuran decapods as intermediate hosts of Acanthocephala from New Zealand. P. antarcticus is recorded from three crab species (Helice crassa, Hemigraspus crenulatus and Macrophthalmus hirtipes) and two bird species (Haematopus o. finschi and Limosa lapponica) in New Zealand. An unidentified species of Plagiorhynchus was also found in two bird species (H. o. finschi and H. unicolor Forster). P. antarcticus and P. novaezelandensis are the first records of Profilicollis from New Zealand.
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              Resurrection of Southwellina Witenberg, 1932, with a description of Southwellina Dimorpha sp. n., and a key to genera in Polymorphidae (Acanthocephala).

               G D SCHMIDT (1973)
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                Author and article information

                Journal
                Parasite
                Parasite
                parasite
                Parasite
                EDP Sciences
                1252-607X
                1776-1042
                2017
                25 October 2017
                : 24
                : ( publisher-idID: parasite/2017/01 )
                Affiliations
                [1 ] Institute of Parasitic Diseases, 11445 E. Via Linda, no. 2-419, Arizona, 85259 Scottsdale U.S.A
                [2 ] Department of Biology, Brigham Young University, Utah, 84602 Provo U.S.A
                Author notes
                Article
                parasite170077 10.1051/parasite/2017038
                10.1051/parasite/2017038
                5657191
                29072573
                © O.M. Amin and R.A. Heckmann, published by EDP Sciences, 2017

                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.

                Page count
                Figures: 6, Tables: 5, Equations: 0, References: 34, Pages: 15
                Categories
                Research Article

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