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Dactylogyrids (Monogenoidea) Parasitizing Microlepidotus brevipinnis (Haemulidae) from the Pacific Coast of Mexico: Magnanchor raris n. gen., n. sp. and Supplementary Taxonomic Information for Mexicana bychowskyi Caballero and Bravo-Hollis 1959

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Abstract

As part of a marine ecology study aimed to discover the diversity of fish parasites, we described a new species representing Magnanchor n. gen. and provided new and supplementary morphometric information for Mexicana bychowskyi, both monogenoidean species collected from the gill lamellae of the humpback grunt Microlepidotus brevipinnis (Haemulidae) from the Pacific coast of Mexico. The new genus is proposed for its unique species, M. raris n. sp. which is characterized in having overlapping gonads (testis posterodorsal to the germarium), a copulatory complex consisting of counterclockwise coils of the copulatory organ that is unarticulated to the accessory piece, a haptor armed with two pairs of anchors (each with broad base and well differentiated roots), dorsal and ventral bars, a dextral vaginal aperture, and 6 pairs of hooks with uniform shank and upright acute thumb. Data on morphological and biometric variability of the six species of Mexicana (including illustrations of the haptoral structures of the present specimens of M. bychowskyi) previously described and/or reported parasitizing different haemulid hosts from the Pacific and Atlantic oceans in the Tropics are also provided. Due to the morphological similarities among the amphiamerican species of Mexicana, they could represent sister-species pairs in the Tropics. Magnanchor raris n. sp. and M. bychowskyi (type species of the genus) are the first dactylogyrids described and/or reported on M. brevipinnis.

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Acknowledgements

The authors are indebted to fishermen who caught the fish in the Acapulco Bay, as well as to the students of the Marine Ecology Faculty (UAGro) for their assistance during field and laboratory work. FVA was supported by a Master student fellowship (scholarship number 1079874) from the Consejo Nacional de Humanidades, Ciencias y Tecnologías (CONAHCYT), Mexico.

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Authors and Affiliations

  1. Instituto de Ecología, Pesquerías y Oceanografía del Golfo de México (EPOMEX), Universidad Autónoma de Campeche (UAC), Av. Héroe de Nacozari No. 480, CP. 24029, San Francisco de Campeche, Campeche, México

    Edgar F. Mendoza-Franco

  2. Laboratory of Ecology, Unidad Academica de Ecología Marina, Universidad Autonoma de Guerrero, Gran Vía Tropical No. 20, Fraccionamiento Las Playas, CP. 39390, Acapulco, Guerrero, Mexico

    Francisco Valente-Alarcon & Juan Violante-Gonzalez

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  1. Edgar F. Mendoza-Franco
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  3. Juan Violante-Gonzalez
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Contributions

E.F.M.-F., F.V.-A. and J.V-G conceptualized manuscript; E.F.M.-F., F.V.-A. and J.V-G. structured methodology; E.F.M.-F., F.V.-A. and J.V-G. validated manuscript; E.F.M.-F. and J.V-G. made investigation; F.V.-A. and J.V-G. provided resources; E.F.M.-F. wrote the main manuscript text and prepared figures; E.F.M.-F., F.V.-A. and J.V-G. reviewed and edited manuscript; E.F.M.-F. and J.V-G supervised manuscript. All authors reviewed manuscript.

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Correspondence to Edgar F. Mendoza-Franco.

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Mendoza-Franco, E.F., Valente-Alarcon, F. & Violante-Gonzalez, J. Dactylogyrids (Monogenoidea) Parasitizing Microlepidotus brevipinnis (Haemulidae) from the Pacific Coast of Mexico: Magnanchor raris n. gen., n. sp. and Supplementary Taxonomic Information for Mexicana bychowskyi Caballero and Bravo-Hollis 1959. Thalassas (2024). https://doi.org/10.1007/s41208-024-00675-5

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