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Resurrection and emendation of Pseudoparamacroderoides Gupta & Agrawal, 1968 (Digenea: Macroderoididae), description of a new species from Vietnam, and comments on the systematics of macroderoidid genera

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Abstract

We herein resurrect and emend Pseudoparamacroderoides Gupta & Agrawal, 1968 (Digenea: Macroderoididae) and describe a new species, Pseudoparamacroderoides dongthapensis n. sp., from adult specimens infecting the intestine of a riverine catfish, Mystus mysticetus Roberts, (Siluriformes: Bagridae) in the Mekong River, Vietnam. Pseudoparamacroderoides (Pseudoparamacroderoides seenghali Gupta & Agrawal, 1968 [type species]; Pseudoparamacroderoides vittati Kakaji, 1969 [= Ps. vittatusi]; Pseudoparamacroderoides raychaudhurii Agarwal & Kumar, 1983; and Pseudoparamacroderoides keni Agarwal & Agarwal, 1984) differs from other macroderoidid genera by having the combination of a subspherical oral sucker that lacks distinctly-enlarged circumoral spines; caeca that extend posteriad beyond the testes without forming a cyclocoel; testes that are approximately ≤1/3 maximum body width in diameter; a cirrus sac that is claviform, slightly dorsal to and predominantly lateral to the ventral sucker (cirrus sac partially dorsolateral to dextral or sinistral margin of ventral sucker); symmetrical vitelline fields that extend posteriad to the middle of the post-testicular space (not restricted to the inter-gonadal space) and that remain separate (not confluent) anteriorly and posteriorly; and an excretory vesicle that is I-shaped (with or without anterior swelling) and wholly post-ovarian, inter-testicular, or median to the posterior testis. Pseudoparamacroderoides dongthapensis n. sp. differs from its congeners by having an elongate hindbody (>2× forebody length) and an excretory vesicle that is approximately half as long as the body and that extends anteriad beyond the anterior testis. This is the first record of a species of Pseudoparamacroderoides from beyond the Indian sub-continent, from M. mysticetus, and from the Mekong River or from Vietnam. A diagnostic key to macroderoidid genera and a key to Pseudoparamacroderoides spp. are provided.

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Acknowledgments

We thank Thuy Ha Nguyen, former Rector of Dong Thap Community College, for hosting us during the collection in Vietnam; Steven P. Ksepka, Micah B. Warren (Auburn University, Auburn, Alabama, USA), and Carlos F. Ruiz (El Paso, Texas, USA) for helping with fish collection, necropsy and identification.

Funding

This study was supported by research grants from the Auburn University Vice President for Research and Economic Development, Southeastern Cooperative Fish Parasite and Disease Project (Alabama Department of Conservation and Natural Resources), Alabama Agriculture Experiment Station, and US Department of Agriculture. Earlier exploratory aspects of this project were supported by grants from the National Science Foundation.

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  1. Aquatic Parasitology Laboratory, Southeastern Cooperative Fish Parasite & Disease Laboratory, School of Fisheries, Aquaculture, & Aquatic Sciences, College of Agriculture, Auburn University, 559 Devall Drive, Auburn, AL, 36832, USA

    Triet N. Truong, Stephen S. Curran, Haley R. Dutton & Stephen A. Bullard

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  1. Triet N. Truong
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Correspondence to Triet N. Truong.

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Ethical approval

All applicable institutional, national and international guidelines for the care and use of animals were followed. Sampling was approved by the People’s Committee of Dong Thap Province, Vietnam (permit no. 85/UBND-ÐN/ 30 August 2018).

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Truong, T.N., Curran, S.S., Dutton, H.R. et al. Resurrection and emendation of Pseudoparamacroderoides Gupta & Agrawal, 1968 (Digenea: Macroderoididae), description of a new species from Vietnam, and comments on the systematics of macroderoidid genera. Syst Parasitol 98, 697–711 (2021). https://doi.org/10.1007/s11230-021-10006-4

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