Abstract
The original description of Hatschekia exigua Pearse, 1951 neglected innumerous features of taxonomic value as well as morphometric data and illustrations. Posteriorly, other author tried to access the type material, but their poor state of preservation compromised a detailed redescription. Since then, this species is in need for new morphological data, mainly from fresh material. In the present work, three specimens of Holocentrus adscensionis from Mucuripe Bay, Fortaleza, State of Ceará, Northeastern Brazil, were parasitized by copepods on their gills. Parasites were fixed and preserved in 80% ethanol and cleared in 85% lactic acid for morphological observations using light microscopy. The females were identified as Hatschekia exigua by the cephalothorax representing about one-fourth of total body length, with lateral margins expanded into lateral lobes, first exopod with basal segment armed with one outer setae and terminal segment with three setae, first endopod with basal segment unarmed and terminal segment with five setae, leg 3 reduced to two setae and leg 4 reduced to single seta. Comparison with the type series revealed morphological differences in trunk and small appendages, which may be related to alterations in the specimens, caused by the mounting methodology and poor preservation. A detailed morphological analysis of the male revealed for the first time that they differ from their closest congeners by having five setae on the last endopodal segment of leg 1, by smooth intercoxal sclerites on legs 1 and 2 and by a proximolateral process on the third segment of antenna. Moreover, this work represents the first report of H. exigua in Brazil and the first hatschekiid copepod found off the coast of Ceará, highlighting that the diversity of Hatschekiidae in this oceanographic region still needs further investigation.
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Acknowledgments
We wish to thank Dr. Chad Walter, Dr. Karen Osborn and Dr. Yolanda Villacampa from the Smithsonian National Museum of Natural History for kindly providing the type-material for examination. Also, thanks to the Instituto de Ciências do Mar – LABOMAR from the Universidade Federal do Ceará for providing facilities during fish analysis.
Funding
João V. Couto was supported by a student fellowship from Coordenação de Aperfeiçoamento de Pessoal do Ensino Superior (CAPES), Brazil. Felipe B. Pereira was supported by the Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG, Process no. APQ-01179-21). Fabiano Paschoal was supported by Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA, Process no. 84516/2022), Brazil.
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JVC and CVF performed field collections; JVC and FP analyzed the copepods and prepared the illustrations; JVC and AJP prepared the main manuscript; FBP and FP supervised the study; all authors reviewed the manuscript & approved the final version.
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Couto, J.V., Pontes, A.J., Feitosa, C.V. et al. Redescription of Hatschekia exigua Pearse, 1951 (Copepoda: Hatschekiidae), parasitic on the Squirrelfish Holocentrus adscensionis (Osbeck, 1765) (Actinopterygii: Holocentridae) off Ceará, Northeastern Brazil, with first description of the male. Syst Parasitol 101, 27 (2024). https://doi.org/10.1007/s11230-024-10151-6
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DOI: https://doi.org/10.1007/s11230-024-10151-6