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Three new species of Plagioporus Stafford, 1904 from darters (Perciformes: Percidae), with a redescription of Plagioporus boleosomi (Pearse, 1924) Peters, 1957

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Abstract

A form of Plagioporus Stafford, 1904 is described from the intestine of three North American species of darters (Perciformes: Percidae) from River West Twin, Wisconsin, USA, that we consider to be conspecific with Plagioporus boleosomi (Pearse, 1924) Peters, 1957 based on similarities in the sucker ratio, extent of the forebody, shape and position of the testes, vitellarium distribution and terminal genitalia. Three new species of Plagioporus are described from the intestine of darters as follows: Plagioporus fonti n. sp. from Percina nigrofasciata Agassiz in Florida, USA, Plagioporus limus n. sp. from Etheostoma squamosum Distler in Arkansas, USA and Plagioporus aliffi n. sp. from Etheostoma blennioides newmanni Miller in Arkansas, USA. Morphologically Plagioporus fonti n. sp., Plagioporus limus n. sp. and Plagioporus aliffi n. sp. are most similar to one another and to P. boleosomi, Plagioporus lepomis Dobrovolny, 1939 and ‘P. etheostomae’, a nomen nudum for a species described from Etheostoma blennioides Rafinesque in Kentucky, USA, all of which are collectively distinguished from congeners in having a combination of confluent vitellarium in the post-testicular space and absence of vitelline follicles with their entire length distributed in the forebody. Plagioporus fonti n. sp., P. limus n. sp. and P. aliffi n. sp. are respectively distinguished from one another and their closest congeners in having the anterior extent of the vitellarium in the anterior half of forebody to slightly anterior to the ventral sucker as opposed to one approximately at the level of the posterior margin of the ventral sucker, possession of an excretory vesicle reaching the anterior testis as opposed to one only reaching the posterior testis and having a longer than wide oral sucker and a wider than long ventral sucker. A Bayesian inference (BI) analysis of partial 28S rDNA sequences was conducted using the three new species and 24 sequences of opecoelids retrieved from GenBank, including ten species of Plagioporus. Plagioporus aliffi n. sp., Plagioporus fonti n. sp. and P. boleosomi comprised a moderately supported sister group to a clade containing all species of Plagioporus except Plagioporus limus n. sp. and Plagioporus shawi (Mcintosh, 1939) Margolis, 1970. Plagioporus limus and in turn P. shawi were resolved as sister to all other congeners with high and moderate support, respectively.

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Acknowledgements

From the University of Southern Mississippi, we thank Dr. Richard Heard and Dr. Robin Overstreet for provision of microscopy equipment and funding for molecular work. We also thank Dr. Dennis J. Richardson (Quinnipiac University, Hamden, CT) for use of a backpack electroshocker in Arkansas. The views expressed herein do not necessarily represent those of the US Fish and Wildlife Service.

Funding

This work would not have been possible without the support Vassar College Fellowships awarded to TJF that provided funds for the collection of freshwater plagioporines and also living expenses while working up species descriptions at St. Norbert College, including an Adolph Sutro Fellowship in 2013/2014, a Nancy Skinner Clark Fellowship in 2014/2015 and an additional Nancy Skinner Clark Fellowship in 2015/2016. AC acknowledges funding from a 2014 Faculty Development Summer Grant from St. Norbert College.

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Correspondence to Thomas J. Fayton.

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The authors declare that they have no conflict of interest.

Ethical approval

All applicable institutional, national and international guidelines for the care and use of animals were followed. The Arkansas Game and Fish Commission issued a Scientific Collecting Permit to CTM. We thank the Florida Fish and Wildlife Conservation Committee and the Wisconsin Department of Natural Resources for issuing permits to collect freshwater fish in Florida and Wisconsin, respectively.

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Fayton, T.J., Choudhury, A., McAllister, C.T. et al. Three new species of Plagioporus Stafford, 1904 from darters (Perciformes: Percidae), with a redescription of Plagioporus boleosomi (Pearse, 1924) Peters, 1957. Syst Parasitol 94, 159–182 (2017). https://doi.org/10.1007/s11230-016-9697-x

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Keywords

  • Anterior Margin
  • Ventral Sucker
  • Oral Sucker
  • Ejaculatory Duct
  • Seminal Receptacle