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Two new species of Colobomatus Hesse, 1873 (Crustacea: Philichthyidae) parasitic in the interorbital canals of Holocentrus spp. (Holocentriformes: Holocentridae) in the South Atlantic Ocean

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Abstract

Two new species of parasitic copepods of the genus Colobomatus Hesse, 1873 (Cyclopoida) are proposed based on specimens collected from the squirrelfishes (Holocentridae) off the coast of Rio de Janeiro, Brazil. Colobomatus luquei n. sp. from the interorbital canals of Holocentrus adscensionis (Osbeck) can be distinguished from its closest congeners by the following combination of characters in the adult female: first to fourth thoracic somites fused, two pairs of thoracic processes, fifth pedigerous somite without processes, and process in the third abdominal somite not transpassing the margins of the caudal rami; and in the adult male: antenna with two elements in the second endopodal segment, leg 1 with three spines and three setae in the second endopodal segment, and leg 2 with three spines and three setae in the second exopodal segment. Colobomatus freirei n. sp. from the interorbital canals of Holocentrus rufus (Walbaum) can be distinguished from its closest congeners through the possession of an anterior pair of thoracic processes four times longer than the posterior pair. The two new species described herein are the first representatives of the family Philichthyidae found to parasitize fish of the order Holocentriformes.

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Acknowledgements

We wish to thank Larissa Machado de Oliveira Maia and Gabriela Silva Canuto, for their help with parasitological examination of fish. We thank Juliana Moreira for the helpful suggestions to an early draft of the manuscript. Finally, we would like to thank Imen Fathallah, Institut Pasteur de Tunis, for providing literature. Fabiano Paschoal was supported by Universidade Castelo Branco (Brazil).

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

    João Victor Couto & Fabiano Paschoal

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  1. João Victor Couto
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  2. Fabiano Paschoal
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Correspondence to Fabiano Paschoal.

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Couto, J.V., Paschoal, F. Two new species of Colobomatus Hesse, 1873 (Crustacea: Philichthyidae) parasitic in the interorbital canals of Holocentrus spp. (Holocentriformes: Holocentridae) in the South Atlantic Ocean. Syst Parasitol 98, 753–764 (2021). https://doi.org/10.1007/s11230-021-10009-1

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