Abstract
The generic diagnosis of Parancylodiscoides Caballero y C. & Bravo-Hollis, 1961 (Monogenoidea: Dactylogyridae), with three valid species, was amended to include dactylogyrids having: a haptor with dorsal and ventral anchor/bar complexes, 14 hooks (seven pairs) and four reservoirs (two pairs); a dorsal bar with bifurcate ends; hooks with protruding, blunt and slightly depressed thumbs and undilated shanks; a dextroventral vaginal aperture leading to an elongate and oblique vaginal vestibule; a germarium dextral to the testis; a vas deferens looping the left intestinal caecum; a copulatory complex lacking an accessory piece; and two intestinal caeca lacking diverticula and united posterior to the gonads. Parancylodiscoides is most similar to Sundatrema Lim & Gibson, 2009, from which it differs only by the position of the vaginal aperture (sinistroventral in Sundatrema spp.) and by lacking a sucker-like genital pore. New information concerning the number and distribution of haptoral hooks, the relative positions of the gonads and the course of the vas deferens was provided for the type-species, P. chaetodipteri Caballero y C. & Bravo-Hollis, 1961. Parancylodiscoides longiphallus (MacCallum, 1915) Lim & Gibson, 2009 was redescribed based on specimens collected from the Atlantic spadefish Chaetodipterus faber from the Gulf of Mexico off Mississippi and Guaratuba Bay, Paraná, Brazil; its occurrence on the Atlantic spadefish from the Gulf of Mexico, Guaratuba Bay and off Puerto Rico represented new geographical records for this helminth. Parancylodiscoides caballerobravorum Cezar, Luque & Amato, 1999 was considered a junior subjective synonym of P. longiphallus. The monotypic Isohaliotrema Young, 1968 was placed in synonymy with Parancylodiscoides and its type-species, I. platacis Young, 1968, transferred to Parancylodiscoides as Parancylodiscoides platacis (Young, 1968) n. comb.
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Acknowledgements
Support from the following individuals is gratefully acknowledged: Robin Overstreet (Gulf Coast Research Laboratory [GCRL]) hosted the author and furnished laboratory supplies, space, equipment and logistical support and Ash Bullard and Jody Peterson (GCRL) assisted during the collection of Atlantic spadefish from the Gulf of Mexico; Eileen Harris (NHMUK), Pat Pilitt (USNPC), Eric Hoberg (USNPC), Luis García Prieto (CNHE) and Jun Araki (MPM) allowed access to museum specimens under their care; Walter Boeger (Universidade Federal do Paraná, Brazil) collected and provided specimens of Parancylodiscoides longiphallus from Brazilian waters and permitted their deposition in the USNPC; and Ernest (Bert) Williams, Jr (University of Puerto Rico) gave permission to report the record of P. longiphallus from off Puerto Rico based on specimens that he had deposited in the USNPC.
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Kritsky, D.C. Revision of Parancylodiscoides Caballero y C. & Bravo-Hollis, 1961 (Monogenoidea: Dactylogyridae), with a redescription of P. longiphallus (MacCallum, 1915) from the Atlantic spadefish Chaetodipterus faber (Broussonet) (Acanthuroidei: Ephippidae) in the Gulf of Mexico. Syst Parasitol 81, 97–108 (2012). https://doi.org/10.1007/s11230-011-9327-6
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DOI: https://doi.org/10.1007/s11230-011-9327-6