Abstract
Members of Forticulcitinae Blasco-Costa, Balbuena, Kostadinova & Olson, 2009 include endoparasites of mullet fishes distributed worldwide. Adult specimens were collected from the intestines of white mullet (Mugil curema) and flathead grey mullet (Mugil cephalus) from five localities in the Gulf of Mexico and a single locality in Venezuela. Photogenophores were sequenced for two nuclear molecular markers, the large subunit (LSU) and second internal transcribed spacer (ITS2) of nuclear rDNA. The new sequences were aligned with other sequences downloaded from GenBank. The maximum likelihood and Bayesian inferences were deduced using the combined dataset (LSU + ITS2). The phylogenetic analyses revealed four new lineages belonging to Forticulcitinae. Three new species are described in the present study. Ekuarhuni mexicanus n. sp. can be differentiated from its congeneric species by presenting a longer hermaphroditic sac length (136–180 μm) and a wider testis (91–123 μm). Forticulcita macropharyngis n. sp. and Forticulcita venezuelensis n. sp. are the 8th and 9th species described in Forticulcita. Both species belong to the diminutive morphotype of Forticulcita. Forticulcita macropharyngis n. sp. can be morphologically distinguished from the other congeneric species by the presence of a massive and muscular pharynx (46–110 μm long, 74–106 μm wide). Forticulcita venezuelensis n. sp. is the second species of the studied genus recorded in South America and can be differentiated from congeneric species by possessing the largest testis (138–201 μm long, 83–100 μm wide). Finally, the fourth lineage corresponds to Overstreetoides Andrade-Gómez & García-Varela, 2021; however, few specimens of this lineage were collected, precluding any description of the species. In addition, a key is proposed for differentiating the genera and species of Forticulcitinae.
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Acknowledgments
The first author thanks the support of the Programa de Posgrado en Ciencias Biológicas, UNAM and CONACYT (LAG CVU. No. 640068), for granting a scholarship to complete his PhD Program. In addition, we are grateful with Laura Marquez and Nelly López, LaNaBio for their help in sequencing DNA. We appreciate Jhonatan Granillo and Dr. Carlos D. Pinacho Pinacho for their help on the field work.
Funding
This research was supported by Grants from the Programa de Apoyo a Proyectos de Investigación e Innovación Tecnológica (PAPIIT-UNAM) IN207219.
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Specimens in Mexico were collected under the Cartilla Nacional de Colector Científico (FAUT 0202) issued by the Secretaría del Medio Ambiente y Recursos Naturales (SEMARNAT), to MGV. All applicable international, and institutional guidelines for the use and care of animals were followed.
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Andrade-Gómez, L., González-García, M.T. & García-Varela, M. Phylogenetic affinities of Forticulcitinae (Haploporidae) parasites of mullet from the Americas, with the description of three new species and notes on the genera and key species. Syst Parasitol 98, 455–476 (2021). https://doi.org/10.1007/s11230-021-09989-x
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DOI: https://doi.org/10.1007/s11230-021-09989-x