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Two myxosporean species: Sphaerospora renicola Dyková et Lom, 1982 and S. molnari Lom, Dyková, Pavlaskova et Grupcheva, 1983 were recorded for the first time in Poland. They were found in young carp after first overwintering in cold- and warm-water ponds. Localization of different developmental stages in carp tissues is described. Differences in frequency of particular developmental stages were noticed between the cold and warm ponds. In fish taken from cold ponds spores occurred rarely. In fish from the warm pond spores were abundant, but extrasporogonic stages were practically undetectable. Symptoms of spring sphaerosporosis are described. They were mainly connected with the presence and release of spores, and were much more serious in carp from the warm pond.
Ceratomyxa parasites from the gall bladders of 23 species of cardinalfishes (family Apogonidae) from Australian waters were examined for their taxonomic identity and phylogenetic relatedness. We identified 15 of the 23 apogonid fish species infected with species of Ceratomyxa. Although the majority of apogonid species harboured only a single Ceratomyxa species, four were found with multiple species of Ceratomyxa. This study describes eight novel species using a combination of morphological, small subunit ribosomal DNA (SSU rDNA) and biological characters. Six Ceratomyxa species are reported from single apogonid species, while two are reported from multiple host species. Molecular data were critical in identifying several morphologically cryptic species. However, our results suggest that SSU rDNA was not capable of distinguishing all the species present in the current study system and alternative genetic markers should be investigated in the future.
Several species of Oligochaeta from Estonian freshwaters were examined for the presence of actinosporean stages of Myxosporea. Three types of triactinomyxon were detected. Two types, isolated from Tubifex tubifex collected in Lake Peipsi and in the River Emajõgi, closely resembled the actinospores of Myxobolus pseudodispar and M. macrocapsularis in shape and size. The third type of triactinospore was isolated from a laboratory culture of T. tubifex of Central Asian origin, maintained in aquaria at the Vortsjärv Limnological Station for more than 25 years and regularly supplied with mud from Lake Võrtsjärv. The latter type differs from all triactinomyxon forms hitherto described. This is the first report on the occurrence of actinospores in Estonia.
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