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Diseases of Aquatic Organisms

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DAO 133:91-98 (2019)  -  DOI: https://doi.org/10.3354/dao03331

Morphology and phylogeny of Henneguya oviperda infecting oocytes of Esox lucius, with description of parasite-induced histopathology

S. G. Sokolov1,2, D. I. Lebedeva2,*, S. A. Murzina2, A. N. Parshukov2, K. A. Bystrova2, E. P. Ieshko2

1A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 33 Leninskij pr., 119071 Moscow, Russia
2Institute of Biology, Karelian Research Center, Russian Academy of Sciences, 11 Pushkinskaya St, 185910 Petrozavodsk, Russia
*Corresponding author:

ABSTRACT: Henneguya oviperda (Cohn, 1895) (Myxozoa: Myxobolidae) is a parasite infecting oocytes of the northern pike Esox lucius Linnaeus, 1758 (Actinopterygii: Esocidae). Infected oocytes are surrounded by all oocyte layers, some of them thinner and less visible than intact oocytes. A mature plasmodium of H. oviperda fills the entire internal space of the oocytes at the secondary growth phase, rendering the nucleus and organelles of the latter undetectable. Apart from the observed degradation of internal structures, alterations in the envelopes of the infected oocytes, and the deformation of the intact oocytes adjacent to them, no other developmental anomalies have been found in the reproductive products of female northern pike. Mature spores of H. oviperda have oval bodies with polar capsules of almost equal size and caudal projections that are on average equal to the spore body length. Phylogenetic analysis comparing 18S rDNA sequences placed H. oviperda into a clade of esocid-infecting species of the genus Henneguya and also supported H. psorospermica as a sister species.


KEY WORDS: Henneguya oviperda · Myxobolidae · Myxozoan · Northern pike · Esox lucius · Oocytes · Phylogeny


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Cite this article as: Sokolov SG, Lebedeva DI, Murzina SA, Parshukov AN, Bystrova KA, Ieshko EP (2019) Morphology and phylogeny of Henneguya oviperda infecting oocytes of Esox lucius, with description of parasite-induced histopathology. Dis Aquat Org 133:91-98. https://doi.org/10.3354/dao03331

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