New host record and molecular characterization of Dicauda atherinoidi Hoffman & Walker (Bivalvulida: Myxobolidae): a parasite of the emerald shiner Notropis atherinoides Rafinesque, 1818 and mimic shiner Notropis vollucellus Cope, 1865

T. P. Loch, T. G. Rosser, W. A. Baumgartner, T. Boontai, M. Faisal, M. J. Griffin

Research output: Contribution to journalArticlepeer-review

Abstract

Updated morphological and histopathological descriptions for Dicauda atherinoidi (Bivalvulida:Myxobolidae) and an expanded host range are supplemented with the first molecular data and phylogenetic analyses of the genus. Plasmodia were located on the head, ventrum/body and fins of infected emerald shiner Notropis atherinoides Rafinesque, 1818 and mimic shiner Notropis vollucellus Cope, 1865, a new host species. Myxospores were spherical, ranging 9.3–11.4 μm (10.5 ± 0.4) in length, 9.0–11.0 μm (9.7 ± 0.4) in width and 6.6–7.0 μm (6.8 ± 0.2) thick in sutural view, and possessed 2-3 caudal processes (5.3–68.3 μm, 31.1 ± 13.6) connected to the spore body at the sutural groove, all of which are consistent with the genus Dicauda. In the absence of available Dicauda sequence data, the 18S rDNA sequences from Michigan isolates were most similar to Myxobolus spp. Phylogenetic analyses clustered these isolates with myxobolid species from cyprinid fish, suggesting these parasites may represent an underpopulated group of cyprinid-infecting myxozoans. Histopathology revealed thin-walled plasmodial pseudocysts in the dermis and associated connective tissue, where granulomatous inflammation and focal scale atrophy were also present. Further sampling/sequencing of myxobolids from Notropis spp. should expand these underrepresented myxozoans and offer further insight into Myxobolidae host family tropisms.

Original languageEnglish (US)
Pages (from-to)1405-1415
Number of pages11
JournalJournal of Fish Diseases
Volume40
Issue number10
DOIs
StatePublished - Oct 2017
Externally publishedYes

Keywords

  • Dicauda atherinoidi
  • Myxobolidae
  • Notropis
  • emerald shiner
  • mimic shiner
  • phylogeny

ASJC Scopus subject areas

  • Aquatic Science
  • veterinary (miscalleneous)

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