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Acta Parasitologica

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Volume 62, Issue 1


Occurrence of two novel actinospore types (Cnidaria: Myxosporea) in Brazilian fish farms, and the creation of a novel actinospore collective group, Seisactinomyxon

Tiago Milanin
  • Corresponding author
  • Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6109, CEP 13083-970 Campinas, SP, Brazil
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/ Stephen D. Atkinson
  • Department of Microbiology, 226 Nash Hall, Oregon State University, Corvallis, Oregon, 97331, United States of America
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/ Márcia R.M. Silva
  • Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo (USP), Rua Duque de Caxias Norte, 225, CEP 13635-900 Pirassununga, SP, Brazil
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/ Roberto G. Alves
  • Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Campus Universitário, Martelos, 36036-330, Juiz de Fora, MG, Bulgaria
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  • De Gruyter OnlineGoogle Scholar
/ Antônio A.M. Maia
  • Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo (USP), Rua Duque de Caxias Norte, 225, CEP 13635-900 Pirassununga, SP, Brazil
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/ Edson A. Adriano
  • Corresponding author
  • Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6109, CEP 13083-970 Campinas, SP, Brazil
  • Departamento de Ciências Biológicas, Universidade Federal de São Paulo, Rua Professor Arthur Riedel, 275, Jardim Eldorado, 09972-270 Diadema, SP Brazil
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Published Online: 2016-12-28 | DOI: https://doi.org/10.1515/ap-2017-0014


The involvement of oligochaetes in the life cycles of fresh water myxozoan parasites in Brazil was investigated. Of 333 oligochaetes collected in a fish farm in the State of São Paulo, three (0.9%) released Aurantiactinomyxon type spores. From 86 worms collected in a fish farm in Mato Grosso do Sul State, 1 (0.9%) released actinospores with a novel morphology for which we propose the name Seisactinomyxon. Infected oligochaetes were identified by morphology: all belonged to family Naididae, with Pristina americana the host for Aurantiactinomyxon and Slavina evelinae the host of Seisactinomyxon. This is the first report of the involvement these two species of oligochaetes in the life cycle of myxozoans. Small subunit rDNA sequences of the Aurantiactinomyxon (1204 nt) and Seisactinomyxon (1877 nt) did not match any previously sequenced myxozoan. Phylogenetic analyses showed that both actinospore types fell in a clade formed by six Myxobolus spp. that parasitize Characiformes fishes.

Keywords: Myxozoa; actinospore; Oligochaete; Naididae; ssrDNA; Brazil


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About the article

Received: 2016-04-21

Revised: 2016-09-08

Accepted: 2016-10-12

Published Online: 2016-12-28

Published in Print: 2017-03-01

Citation Information: Acta Parasitologica, Volume 62, Issue 1, Pages 121–128, ISSN (Online) 1896-1851, ISSN (Print) 1230-2821, DOI: https://doi.org/10.1515/ap-2017-0014.

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