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New data on Henneguya postexilis Minchew, 1977, a parasite of channel catfish Ictalurus punctatus, with notes on resolution of molecular markers for myxozoan phylogeny

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Abstract

Previous morphological and histological data are supplemented with molecular and ultrastructural data for a Henneguya sp. isolated from farm-raised channel catfish Ictalurus punctatus in Mississippi, USA. Myxospores were cryptic, encapsulated within a thin layer of epithelium in the gill lamellae with spore measurements consistent with the original description of Henneguya postexilis Minchew, 1977. Myxospores were 42.7–49.1 µm in total length with spore bodies 12.1–17.2 × 3.6–4.8 × 2.9–3 µm. Polar capsules were of unequal length, with the longer capsule being 4.4–6.7 × 1.1–1.6 µm and the shorter capsule being 4.4–6.4 × 1.1–1.6 µm. Polar tubules had 6–8 turns. Caudal processes were 25.7–38.1 µm in length. Spores were encapsulated in a thin layer of epithelium in the gill lamellae. Molecular data from the most commonly used markers for myxozoan identification and phylogeny, partial 18S small subunit ribosomal gene (SSU), partial 28S large subunit ribosomal gene (LSU), and elongation factor 2 (EF2) were generated for H. postexilis. Additionally, novel data for LSU and EF2 were generated for archived myxozoan specimens from farm-raised catfish (H. mississippiensis, H. ictaluri, H. exilis, H. adiposa, H. sutherlandi, H. bulbosus, Unicauda fimbrethilae), as well as archived specimens from wild fish (H. laseeae [from Pylodictis olivaris], Hennegoides flockae [from Aphredoderus sayanus], Myxobolus cloutmani [from Cycleptus elongatus]. These include the first EF2 sequence data for the genera Hennegoides and Unicauda. Phylogenetic analyses using these data placed H. postexilis in well supported clades with other ictalurid-infecting Henneguya species. Phylogenetic signal assessments on these analyses suggest that while SSU provided the greatest phylogenetic signal, LSU yielded comparable signal, supporting previous work implying this region may be underutilised in reconstructing myxobolid phylogenies.

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Acknowledgements

The authors thank Derek Marshall of Mississippi State University’s College of Veterinary Medicine Library for providing access to primary literature. Molecular data generated in this study are publicly available in GenBank (MZ905344–MZ905348, OK030693–OK030702, OK065607–OK065617). Photovouchers of myxospores are deposited in the Harold W. Manter Laboratory of Parasitology, University of Nebraska State Museum, Lincoln, Nebraska, USA (HWML 216707). A slide of a histological section through plasmodia is similarly deposited (HWML 216706).

Funding

This material is based upon work supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, Project Number MIS‐371530, the U.S. Department of Agriculture, Agricultural Research Service–Catfish Health Initiative, the Mississippi State University College of Veterinary Medicine, the Mississippi Agriculture and Forestry Experiment Station (MAFES) and the National Center for Veterinary Parasitology.

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Woodyard, E.T., Rosser, T.G., Stilwell, J.M. et al. New data on Henneguya postexilis Minchew, 1977, a parasite of channel catfish Ictalurus punctatus, with notes on resolution of molecular markers for myxozoan phylogeny. Syst Parasitol 99, 41–62 (2022). https://doi.org/10.1007/s11230-021-10015-3

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