Systematic Parasitology

, Volume 72, Issue 1, pp 71–79 | Cite as

Some remarks on the occurrence, host-specificity and validity of Myxobolus rotundus Nemeczek, 1911 (Myxozoa: Myxosporea)

  • Kálmán Molnár
  • Csaba SzékelyEmail author
  • Sascha L. Hallett
  • Stephen D. Atkinson


Myxobolus rotundus Nemeczek, 1911 is a common and specific parasite of the common bream Abramis brama (L.). Small, round or ellipsoidal shaped plasmodia of this species develop in the gill and exhibit strong histotropism to the secondary gill lamellae with plasmodial development in their capillary network. M. rotundus is frequently found in mixed infection with M. bramae Reuss, 1906, a parasite of the afferent arteries of gill filaments. The round spores of M. rotundus resemble several other Myxobolus spp., but can be distinguished from these by their small subunit ribosomal RNA gene sequence (GenBank accession no. EU710583), which also differs from the sequence for ‘M. rotundus’ from the skin of Chinese goldfish Carassius auratus auratus (L.), which we suggest has been misidentified. The SSU rRNA gene sequence of M. rotundus myxospores from bream corresponded to Triactinomyxon type 4 actinospores (AY495707) isolated from Tubifex tubifex (Müller) by Hallett et al. (2005), and we infer from this that these are alternate life stages.


Capillary Network Polar Capsule Polar Filament Gill Lamella Common Bream 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors thank Györgyi Ostoros for her help with the histological work and for preparing the line drawings. The study was made possible by grants of the Hungarian Scientific Research Fund (project no. K 71837) and the Oregon State University General Research Fund.


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Kálmán Molnár
    • 1
  • Csaba Székely
    • 1
    Email author
  • Sascha L. Hallett
    • 2
  • Stephen D. Atkinson
    • 2
  1. 1.Veterinary Medical Research InstituteHungarian Academy of SciencesBudapestHungary
  2. 2.Center for Fish Disease Research, Department of MicrobiologyOregon State UniversityCorvallisUSA

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