From the authors' own experiments as well as from data of the literature it now seems unquestionable that myxosporeans, which are common pathogens of fish, are primitive metazoan parasites that develop via alternate hosts (a fish and an oligochaete species). In laboratory experiments with 7 myxosporean species, the authors infected oligochaetes with myxospores collected from fish and demonstrated the emergence of actinospores after a development period of 2-5 months. In the case of the species Myxobolus drjagini, M. portucalensis and M. hungaricus the development in Tubifex tubifex resulted in triactinomyxon-type actinospores, while the species M. dispar gave rise to raabeia-type actinospores as a result of development in the same alternate hosts. The development of two Thelobanellus species and Spbaerospora renicola took place in the oligochaete Branchiura sowerbyi, T. nikolskii and T. bovorkai formed aurantiactinomyxon-type while S. renicola gave rise to neoactinomyxon-type spores. Comparing our own results with data of the literature it appears that the Myxobolus species best known from fish appear in triactinomyxon or raabeia forms in their alternate hosts, whereas sphaerospores and the species taxonomically close to them form neoactinomyxon spores. The aurantiactinomyxon-type spores seem to represent the commonest form, since this is the spore form in which the actinospore stages of even taxonomically distant myxosporeans may appear.
|Number of pages||9|
|Journal||Magyar Allatorvosok Lapja|
|Publication status||Published - Dec 1 1999|
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