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A New Species of Hatschekiid Copepod (Crustacea: Hatschekiidae) Parasitic on the Porkfish Anisotremus virginicus (Linnaeus, 1758) (Actinopterygii: Haemulidae), with Notes on Previously Known Species of Hatschekia Poche, 1902 Collected from Actinopterygians off Brazil

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Abstract

Introduction

Copepods of the genus Hatschekia Poche, 1902 are parasitic on the gills of marine actinopterygians. Currently, about 151 species of this genus have been reported in marine ecosystems and only few occur in South Atlantic Ocean.

Methods

Fifty specimens of A. virginicus from Angra dos Reis, off the State of Rio de Janeiro, Brazil, were parasitized by copepods on the gills. Parasites were fixed and preserved in 70% ethanol. Morphological observations were based on light and scanning electron microscopy.

Results

Hatschekia nagasawai n. sp. can be distinguished from all congeners by the combination of the following characters: (1) presence of two pointed processes on the proximal (first) segment of antennule, (2) cephalothorax octagonal to ovoid, (3) absence of processes on the intercoxal sclerite of legs 1 and 2, (4) trunk without lobes at the postero-lateral margins. Other species of Hatschekia and their hosts previously collected off Brazil were analysed and discussed.

Conclusions

This is the first report of a representative of the family Hatschekiidae Kabata, 1979 parasitizing a species of Anisotremus. The number of species of Hatschekia reported in the South Atlantic Ocean was increased to five, including the new species; however, the diversity of hatschekiid copepods in this oceanographic region is still underestimated, most likely being higher than what is currently known.

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Acknowledgements

We are thankful to Dra. Cristiana Serejo and Dra. Irene Cardoso, Curators at the Museu Nacional do Rio de Janeiro, Brazil, and Dr. Marcelo Knoff, Curator at the Coleção Helmintológica do Instituto Oswaldo Cruz, Brazil, for lending vouchers of Hatschekia spp. Thanks are also due to Dr. Daysuke Uyeno from Kagoshima University, Japan, for providing literature. Fabiano Paschoal was supported by Universidade Castelo Branco Rio de Janeiro (Brazil). José L. Luque was supported by a research fellowship from the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico do Brazil (CNPq).

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Authors and Affiliations

  1. Laboratório de Parasitologia Animal, Centro Estudos e Pesquisas em Biologia-CEPBio, Universidade Castelo Branco, Avenida Santa Cruz, 1631, Realengo, Rio de Janeiro, RJ, 21710-255, Brazil

    Fabiano Paschoal

  2. Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antonio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil

    João Victor Couto & Felipe Bisaggio Pereira

  3. Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, 23897-000, Brazil

    José Luis Luque

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  1. Fabiano Paschoal
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Correspondence to Fabiano Paschoal.

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All applicable institutional, national, and international guidelines for the care and use of animals were followed. The authors declare that the animals used in the work were acquired dead in fish markets and there is no need for approval by the Research Ethics Committee.

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Paschoal, F., Couto, J.V., Pereira, F.B. et al. A New Species of Hatschekiid Copepod (Crustacea: Hatschekiidae) Parasitic on the Porkfish Anisotremus virginicus (Linnaeus, 1758) (Actinopterygii: Haemulidae), with Notes on Previously Known Species of Hatschekia Poche, 1902 Collected from Actinopterygians off Brazil. Acta Parasit. 67, 1126–1135 (2022). https://doi.org/10.1007/s11686-022-00551-3

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