Abstract
Phyllodistomum inecoli n. sp. is described from the twospot livebearer, Heterandria bimaculata (Teleostei: Poeciliidae), collected in the Río La Antigua basin, Veracruz, Mexico. The new species is described and characterised by using a combination of morphology, scanning electron microscopy, and sequences of nuclear and mitochondrial genes. Diagnostic characters of the new species of Phyllodistomum include a genital pore opening at the level of the caecal bifurcation; oval vitellarium, situated just posterior to the ventral sucker and not extended laterally and anterior extracaecal uterine loops variable in extension (reaching the anterior, median or posterior margin of the ventral sucker). P. inecoli n. sp. most closely resembles P. brevicecum, a species described as a parasite of the central mudminnow, Umbra limi, in other parts of North America; however, the genital pore in P. brevicecum is situated between the caecal bifurcation and the ventral sucker, the ovary is larger, the vitellarium is lobed and extended laterally and the anterior portion of the uterus extends to the posterior margin of the ventral sucker. Comparison of about 1,500–2,200 nucleotides of cox1 and 28S rDNA and ITS1 strongly supports the status of P. inecoli as a new species. Bayesian inference analysis of combined datasets of 28S rDNA and cox1 sequences showed that P. inecoli n. sp. and the other species found in freshwater fishes of Mexico, including the species complex of P. lacustri, are not sister species. Phylogenetic analysis based on 28S rDNA sequences of several gorgoderid taxa revealed the close relationship of P. inecoli n. sp. with several species of Phyllodistomum, Gorgodera and Gorgoderina with cystocercous cercariae developing in sphaeriid bivalves. Dot-plot analysis of ITS1 sequences of P. inecoli n. sp. revealed the presence of eight repetitive elements with different length, which together represent almost half the length of ITS1.
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Acknowledgments
We are grateful to Ismael Guzmán for his help with collecting hosts. We thank Luis García, CNHE, Mexico City, for the loan of specimens. We are especially grateful to Anindo Choudhury, St. Norbert College, Wisconsin, USA, for the donation of specimens of Phyllodistomum spp. Thanks are also due to Berenit Mendoza for preparing samples for the SEM study, and Laura Márquez for her help with obtaining the sequences. We acknowledge the constructive comments to the first draft of the paper by Thomas Cribb (University of Queensland, Australia) and one anonymous reviewer. U.R.M. thanks the Instituto de Ecología, A.C. (INECOL) for providing research facilities during his postdoctoral stay and for granting his postdoctoral fellowship. This research was supported by grants from Consejo Nacional de Ciencia y Tecnología (CONACyT No. 168306) to M.R.G., and from Dirección General de Asuntos del Personal Académico (PAPIIT IN202111) to G.P.P.L.
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Fig. S1
Dot-plot analysis of ITS sequences of Phyllodistomum inecoli n. sp. Presence of repetitive elements within ITS sequences is evidenced by the number of lateral diagonals on both sides of the central diagonal (PDF 64 kb)
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Razo-Mendivil, U., Pérez-Ponce de León, G. & Rubio-Godoy, M. Integrative taxonomy identifies a new species of Phyllodistomum (Digenea: Gorgoderidae) from the twospot livebearer, Heterandria bimaculata (Teleostei: Poeciliidae), in Central Veracruz, Mexico. Parasitol Res 112, 4137–4150 (2013). https://doi.org/10.1007/s00436-013-3605-y
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DOI: https://doi.org/10.1007/s00436-013-3605-y