Redescription of three species of nematodes (Nematoda) parasitising fishes in the USA, with a key to the species of Dichelyne Jägerskiöld, 1902 parasitic in freshwater and brackish-water fishes of North America

Abstract

Three species of parasitic nematodes are redescribed based on light and scanning electron microscopical (SEM) examinations of newly collected specimens in fishes of South Carolina, USA: Dichelyne (Cucullanellus) bullocki Stromberg & Crites, 1972 from Fundulus heteroclitus (Linnaeus) (Fundulidae); Dichelyne (Dichelyne) diplocaecum Chandler, 1935 from Ictalurus furcatus (Valenciennes) (Ictaluridae); and Hysterothylacium pelagicum Deardorff & Overstreet, 1982 from Coryphaena hippurus Linnaeus (Coryphaenidae). For the first time, intraspecific variations in the number of intestinal caeca were observed in D. bullocki, as well as previously unknown males and gravid females of D. diplocaecum are described; this enabled to synonymise D. mexicanus Caspeta-Mandujano, Moravec & Salgado-Maldonado, 1999 with D. diplocaecum. Unlike most congeneric species, H. pelagicum has no double postanal papillae, as confirmed by SEM. A key to the species of Dichelyne Jägerskiöld, 1902 parasitic in freshwater and brackish-water fishes in North America is provided.

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Acknowledgements

We thank the staff of the SC DNR, Charleston SC for providing fish specimens. Thanks are also due to the Laboratory of Electron Microscopy, Institute of Parasitology, Biology Centre CAS, institution supported by the MEYS CR (LM2015062 Czech-BioImaging) for their support with obtaining scientific data presented in this paper, and to Blanka Škoríková of the same Institute for help with the illustrations.

Funding

This study was partly supported by the Czech Science Foundation (Grant. No. P505/12/G112), and by institutional support (RVO:60077344, Institute of Parasitology, BC AS CR; Department of Biology, College of Charleston, SC, USA).

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Correspondence to František Moravec.

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All applicable institutional, national and international guidelines for the care and use of animals were followed. When live fish were collected (Mummichogs), they were euthanized according to the approved ethical codex of the College of Charleston IACUC-2018-003.

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This article is part of the Topical Collection Nematoda.

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Moravec, F., de Buron, I. & González-Solís, D. Redescription of three species of nematodes (Nematoda) parasitising fishes in the USA, with a key to the species of Dichelyne Jägerskiöld, 1902 parasitic in freshwater and brackish-water fishes of North America. Syst Parasitol 96, 79–94 (2019). https://doi.org/10.1007/s11230-018-9829-6

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