Morphology and small subunit rDNA-based phylogeny of Ceratomyxa amazonensis n. sp. parasite of Symphysodon discus, an ornamental freshwater fish from Amazon.
The specious genus Ceratomyxa Thélodan, 1892, infect mainly gallbladder of marine fishes, with only five species reported infecting species from freshwater environment. This study performed morphological and phylogenetic analyses involving a new Ceratomyxa species (Ceratomyxa amazonensis n. sp.) found in gallbladder of Symphysodon discus Heckel, 1840 (Perciformes: Cichlidae), an important ornamental fish endemic to Amazon basin. Mature spores were strongly arcuate shaped and measured 7.0 ± 0.3 (6.2-7.6) μm in length, 15.8 ± 0.4 (15.0-16.7) μm in thickness, and polar capsules 3.22 ± 0.34 (2.4-3.6) μm in length and 2.63 ± 0.17 (2.4-2.9) μm in width. This was the first small subunit ribosomal DNA (SS rDNA) sequencing performed to Ceratomyxa species parasite of freshwater fish, and the phylogenetic analysis showed C. amazonensis n. sp. clustering in the early diverging subclade of the ceratomyxids, together with species of parasites of amphidromous/estuaries fishes, suggesting some role of the transition of the fishes between marine/freshwater environments in the evolutionary history of these parasites.
Department of Animal Biology, Institute of Biology, Campinas State University, Caixa Postal 6109, CEP 13083-970, Campinas, SP, Brazil.
Patrick D
PD
Mathews
Department of Biological Sciences, Federal University of São Paulo, Rua Professor Arthur Riedel, 275, Jardim Eldorado, 09972-270, Diadema, SP, Brazil.
Juliana
J
Naldoni
Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, São Paulo University, Avenida Duque de Caxias Norte, 225, 13635-900, Pirassununga, SP, Brazil.
Antonio A
AA
Maia
Department of Animal Biology, Institute of Biology, Campinas State University, Caixa Postal 6109, CEP 13083-970, Campinas, SP, Brazil. edapadriano@gmail.com.|Department of Biological Sciences, Federal University of São Paulo, Rua Professor Arthur Riedel, 275, Jardim Eldorado, 09972-270, Diadema, SP, Brazil. edapadriano@gmail.com.
Edson A
EA
Adriano
D000818:Animals; D001938:Brazil; D023681:Cichlids; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D005393:Fish Diseases / Q000469:parasitology*; D005618:Fresh Water; D005704:Gallbladder / Q000469:parasitology; D055764:Myxozoa / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification / Q000648:ultrastructure; D010273:Parasitic Diseases, Animal / Q000469:parasitology*; D010802:Phylogeny; D017422:Sequence Analysis, DNA / Q000662:veterinary; D013170:Spores
D004275:DNA, Ribosomal
Ceratomyxidae evolution; Fish parasite; Myxosporea; Myxozoa; Ornamental fish; Systematic