Acta Parasitologica

, Volume 64, Issue 4, pp 850–865 | Cite as

A New Genus of Ergasilidae (Copepoda: Cyclopoida) from the Gills of Astyanax fasciatus (Cuvier, 1819) (Actinopterygii: Characidae)

  • Rodrigo Bravin NarcisoEmail author
  • Heleno Brandão
  • Gilmar Perbiche-Neves
  • Reinaldo José da Silva
Original Paper



To describe a new genus and a new species of an ectoparasitic ergasilid (Copepoda, Ergasilidae) parasite of the red-tailed lambari, Astyanax fasciatus, from Jurumirim Reservoir (Upper Paranapanema River), São Paulo State, Brazil.


The host fish were collected using multi-panel gill nets. The gill of each fish was washed and examined in a stereo microscope for copepods. The copepods found were stored in 70% ethanol, cleared in lactic acid, and mounted in Hoyer’s medium. Some specimens were dissected in glycerol medium and then each dissected part was mounted on individual slides.


A new genus and a new species of Ergasilidae were described herein. Duoergasilus basilongus n. gen., n. sp. differs from all other ergasilids in having the second and third pair of biramous swimming legs (P2 and P3) each with a 2-segmented endopod, and by its unique maxillary basis, resembling a whip.


The new copepod is the first ‘four-legged’ ergasilid with all swimming legs having a 2-segmented endopod. Duoergasilus basilongus n. sp. represents the first record of a parasitic copepod on A. fasciatus in Jurumirim Reservoir, as well as its represents the first description to species level of an ergasilid infecting an Astyanax species in Brazil. A key to the 28 accepted genera of Ergasilidae is provided.


Brazil Ectoparasite Freshwater Identification key Jurumirim Teleostei 



This study was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (Proc. #2011/24159-3). R.B.N thanks the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the financial support given to the study (132844/2018-4). R.J.S. is supported by FAPESP #2016/50377-1; CNPq #309125/2017-0; CNPq-PROTAX #440496/2015-2.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflicts of interest.

Ethical Standards

All applicable international, national, and/or institutional guidelines for the use and care of animals were followed.


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Copyright information

© Witold Stefański Institute of Parasitology, Polish Academy of Sciences 2019

Authors and Affiliations

  1. 1.Institute of BiosciencesSão Paulo State University (Unesp)BotucatuBrazil
  2. 2.Universidade Tecnológica Federal do Paraná (UTFPR)Santa HelenaBrazil
  3. 3.Universidade Federal de São Carlos (UFSCAR)BuriBrazil

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