Morphostructural data and phylogenetic relationships of a new cnidarian myxosporean infecting spleen of an economic and ecological important bryconid fish from Brazil

Milanin, Tiago; Mathews, Patrick D.; Morandini, André C.; Mertins, Omar; Audebert, Fabienne; Pereira, Jose O.L.; Maia, Antônio Augusto Mendes

doi:10.1016/j.micpath.2020.104718

Cited by 5 publications

(3 citation statements)

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“…The molecular phylogenetic analysis performed in our study showed members of genus Myxobolus and Henneguya grouped together in the produced tree ( Figure 3 ). This is in agreement with previous studies in South America [ 6 , 9 , 26 ] and other biogeographic regions around the world that showed absence of phylogenetic separation between these two genera [ 4 , 27 ]. Our phylogenetic analysis also showed a strong tendency of myxobolid species to form clusters mainly based on the order and/or family of the host, despite having different geographic origins, as has been previously reported [ 6 , 9 , 27 ].…”

Section: Discussionsupporting

confidence: 93%

“…This is in agreement with previous studies in South America [ 6 , 9 , 26 ] and other biogeographic regions around the world that showed absence of phylogenetic separation between these two genera [ 4 , 27 ]. Our phylogenetic analysis also showed a strong tendency of myxobolid species to form clusters mainly based on the order and/or family of the host, despite having different geographic origins, as has been previously reported [ 6 , 9 , 27 ]. According to Carriero et al [ 9 ] the strong tendency of Myxobolus / Henneguya species to cluster, based on host phylogenies, suggests that the origins and radiations of myxozoans are very ancient, perhaps as old as the hosts themselves that go back to an Osteichthyes Early Silurian origin and Mesozoic radiation.…”

Section: Discussionsupporting

confidence: 93%

“…Regarding South America, several studies have described Myxobolus species infecting many species of wild and farmed freshwater fish [ 3 , 6 , 7 ]. Despite this, information on ornamental freshwater fish is still scarce.…”

Section: Introductionmentioning

confidence: 99%

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Host–Parasite Interaction and Phylogenetic of a New Cnidarian Myxosporean (Endocnidozoa: Myxobolidae) Infecting a Valuative Commercialized Ornamental Fish from Pantanal Wetland Biome, Brazil

Mathews

Mertins

Gonzales³

et al. 2022

Pathogens

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Myxozoans are a diverse group of parasitic cnidarians of wide distribution. A new species, Myxobolus matogrossoensis n. sp., is herein described infecting wild specimens of tetra mato-grosso Hyphessobrycon eques, caught in the Pantanal biome, the world’s largest tropical wetland area. Cysts were found in 3 of the 30 examined fishes. Mature myxospores were ovoid in shape in frontal and measured 6.6 ± 0.4 µm (6.2–7.0 µm) in length and 3.5 ± 0.2 µm (3.3–3.7 µm) in width. The two polar capsules were elongated in shape, equal in size and occupying almost half of the myxospore body. They measured 3.3 ± 0.2 µm (3.1–3.5 µm) in length and 1.8 ± 0.1 µm (1.7–1.9 µm) in width. The polar tubules presented three to four turns. Phylogenetic analysis placed the new species within a clade containing myxobolid species from South American characiforms fish and appears as a close species of Myxobolus piraputangae and Myxobolus umidus. Nevertheless, the sequences of the new species and P. umidus and P. piraputangae have a large genetic divergence of 12 and 12.2% in their 18S rDNA gene, respectively. To the best of our knowledge, this is the first report of a Myxobolus species parasitizing the tetra fish mato-grosso, thus increasing our knowledge of cnidarian myxosporean diversity from South America.

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