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Ceratomyxa   amazonensis    is a cnidarian myxosporean originally described with strongly arcuate crescent-shaped myxospores, absence of vegetative stages and infecting    Symphysodon   discus   , an important Amazonian ornamental fish in the aquarium industry. As part of a long-term investigation concerning myxosporeans that infectdiscus   fish    Symphysodon    spp. from different rivers of the Amazon Basin, thirty specimens of    S.   discus    collected from Unini River were examined. Plasmodial vegetative stages therefrom were found freely floating in the bile of gall bladders from eighteen fish. Mature myxospores were slightly crescent-shaped, measuring 4.72 ± 0.1 (4.52–4.81) μm in length, 24.2 ± 0.4 (23.9–25.3) μm in thickness with polar capsules 2.31 ± 0.1 (2.29–2.33) μm in length and 2.15 ± 0.1 (2.13–2.17) μm in width. Strong morphological differences were observed between the newly isolated myxospores obtained and the previously described    C.   amazonensis   ; however, molecular assessment, based on 18S rDNA, revealed a high similarity (99.91%), with only a single nucleotide base change. This study provides new data, expanding the original description of the species with a discussion on differences in myxospore-morphology in the context of intraspecific morphological plasticity.

zoosystematics and evolution

Molecular diagnostic based on 18S rDNA and supplemental taxonomic data of the cnidarian coelozoic    Ceratomyxa    (  Cnidaria  ,   Myxosporea  ) and comments on the intraspecific morphological variation