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The first report on the occurrence of an actinosporean stage (Myxozoa) in oligochaetes in the coastal zone of Lake

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A novel Triactinomyxon type myxozoan parasite was identified in Lake Baikal oligochaetes. This parasite caused significant damage to the host's intestinal cells, highlighting potential ecological impacts.

Keywords:
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Area of Science:

  • Aquatic Parasitology
  • Myxozoan Biology
  • Oligochaete Ecology

Background:

  • Myxozoan parasites are significant pathogens in aquatic ecosystems.
  • Oligochaetes serve as intermediate hosts for many myxozoan species.
  • Understanding parasite-host interactions is crucial for aquatic health.

Purpose of the Study:

  • To identify and characterize a novel myxozoan parasite found in Lake Baikal oligochaetes.
  • To investigate the pathological effects of the parasite on its host.
  • To determine the phylogenetic position of the novel parasite.

Main Methods:

  • Collection and examination of oligochaetes from Lake Baikal.
  • Morphological and molecular analysis (18S rDNA sequencing) of the parasite.
  • Phylogenetic analysis using BLAST and sequence comparison.

Main Results:

  • One specimen of *Limnodrilus udekemianus* (0.1%) was infected with Triactinomyxon type MNV actinospores.
  • Actinospores developed in the intestinal epithelium, causing hypertrophy and cell death.
  • The 18S rDNA sequence (PP575756) showed 97.51% similarity to *Chloromyxum legeri*.

Conclusions:

  • Triactinomyxon type MNV represents a novel myxozoan species infecting oligochaetes in Lake Baikal.
  • The parasite induces significant histopathological changes in the host's intestinal epithelium.
  • Phylogenetic analysis places this parasite within the *Chloromyxum* genus, suggesting a potential link to cyprinid fish.