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<p>During a 2024 survey for actinosporeans at Tasik Telabak, Malaysia, three distinct aurantiactinomyxon types were identified from different specimens of the oligochaete <i>Aulophorus</i> sp. and characterized through both morphological and molecular analyses. Morphometric measurements revealed notable differences among the three types, particularly in the length of their caudal processes, despite all three types being found in the same host species. Analysis of the 18S ribosomal DNA (rDNA) of these aurantiactinomyxon types showed no close matches to existing myxozoan sequences in GenBank. Phylogenetic analyses placed all three types within a myxobolid clade dominated by <i>Henneguya</i> spp.; aurantiactinomyxon type 1 formed a subclade with <i>Myxobolus miyairii</i> from <i>Silurus asotus</i>, while aurantiactinomyxon types 2 and 3 clustered at the base of a larger subclade comprising mainly <i>Henneguya</i> species that infect <i>Ictalurus punctatus</i> and related catfish species. This study represents the second report of myxosporean infections in Malaysian oligochaete communities.</p>

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Description of three new types of aurantiactinomyxon actinospores (Myxozoa: Myxosporea) from the oligochaete Aulophorus sp. in Tasik Telabak, Malaysia

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  • 发表日期：

    2026年7月29日

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  • Nadhirah Syafiqah Suhaimi,
  • Csaba Székely,
  • Gábor Cech,
  • Boglárka Sellyei,
  • Muhammad Hafiz Borkhanuddin

摘要

During a 2024 survey for actinosporeans at Tasik Telabak, Malaysia, three distinct aurantiactinomyxon types were identified from different specimens of the oligochaete Aulophorus sp. and characterized through both morphological and molecular analyses. Morphometric measurements revealed notable differences among the three types, particularly in the length of their caudal processes, despite all three types being found in the same host species. Analysis of the 18S ribosomal DNA (rDNA) of these aurantiactinomyxon types showed no close matches to existing myxozoan sequences in GenBank. Phylogenetic analyses placed all three types within a myxobolid clade dominated by Henneguya spp.; aurantiactinomyxon type 1 formed a subclade with Myxobolus miyairii from Silurus asotus, while aurantiactinomyxon types 2 and 3 clustered at the base of a larger subclade comprising mainly Henneguya species that infect Ictalurus punctatus and related catfish species. This study represents the second report of myxosporean infections in Malaysian oligochaete communities.