Abstract - Jirku et al. 2007

Tracing the genus Sphaerospora: a case of the Sphaerospora ranae (Morelle, 1929) n. comb. (Myxosporea, Sphaerosporidae), renal myxosporean from the European frogs of the genus Rana ­ rediscovery, redescription, phylogeny and emendation of the genus Sphaerospora
Parasitology. 134:1727-1739
Using a combination of morphological, life-history and molecular data, we redescribe Sphaerospora ranae (Morelle, 1929) n. comb. (previously Leptotheca ranae) and emend its taxonomic status. Renal infection was recorded in 2 spp. of frogs (out of 5 amphibian spp. examined), Rana dalmatina (proposed type host) and Rana temporaria, suggesting restricted host specifity of S. ranae.We provide a description of sporogonic stages of S. ranae for the first time and suggest possible modes of its developmental cycle. Phylogenetic analysis inferred from the small-subunit ribosomal DNA revealed a close relationship of S. ranae with piscine Sphaerospora elegans (type species of the genus) and Sphaerospora truttae, forming together with distantly related Leptotheca fugu a "Sphaerosporid clade", the basal branch to all myxosporean species. The close relationship of the 3 Sphaerospora spp. is further supported by the presence of 2 areas with extensive nucleotide insertions in the V4 region of the SSU rDNA (absent in L. fugu), morphology and life-history features. We conclude, that the spore morphology of Sphaerospora s.l., is very simple and probably represents a "primitive", basal morphotype retained in most myxosporean lineages. Based on presented data, we propose emendation of the genus Sphaerospora using morpological, life-history and molecular features.
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