Abstract
Diplostomum ardeae Dubois, 1969 has seldom been reported since its description from the great blue heron (Ardea herodias L., 1758) in the USA. Sequences obtained in this study from the barcode region of cytochrome c oxidase 1 (CO1) in diplostomids from black-crowned night heron (Nycticorax nycticorax (L., 1758)) in Puerto Rico matched data from D. ardeae from A. herodias in the type region. We also obtained DNA barcodes from morphologically similar diplostomids from a rufescent tiger heron (Tigrisoma lineatum (Boddaert, 1783)) and from metacercariae from eye lenses of Trachelyopterus galeatus (Linnaeus, 1766) from the Paraná River basin in Argentina and Brazil, respectively. Barcodes matched (97–100% identity) in these South American adult and larval specimens as well as in recently published sequences from metacercariae from 11 other siluriform fishes from the same region. Barcodes from the South American species, which we describe as Diplostomum lunaschiae n. sp., differed from those of D. ardeae by 7.2–9.8%, and the new species differs from D. ardeae in its size, pharynx:oral sucker length ratio, egg:body length ratio, and distribution of vitellaria. As in prior phylogenetic analysis of CO1 sequences, both D. ardeae and D. lunaschiae n. sp. were not associated with Diplostomum. In more character-rich analyses of nuclear rDNA and of mitochondrial genomes, D. ardeae was an early divergent member of clades of species of Diplostomum. Consequently, we continue to consider D. ardeae and D. lunaschiae n. sp. members of Diplostomum, in contrast to recent suggestions that these species may belong to a different genus.
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Data availability
Nucleotide sequences reported here are available in GenBank (D. ardeae mitochondrial genome MT259035 and rDNA operon MT259036; D. ardeae and D. lunaschiae n. sp. CO1 DNA barcodes MT324592-626), and vouchers have been deposited at the Museum of Southwestern Biology (MSB: Para:30692-3) and Museo de La Plata (MLP-He 7656).
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Acknowledgments
Three anonymous reviewers provided comments on earlier drafts that improved this article. Susan Wylie and staff at Le Nichoir, Hudson, Quebec, provided access to a salvaged carcass of A. herodias. Fieldwork in Formosa was conducted with Agustín M. Abba (CONICET) and our departed colleague and friend, Luis Gerardo Pagano (1985–2020), some of whose contributions are reviewed by Gómez and López (2015).
Funding
This study was financially supported by the Puerto Rico Science, Technology and Research Trust (grant 2016-00080); the National Science Foundation’s Division of Environmental Biology (grant 1845021); Paul D. N. Hebert (University of Guelph) through funding from NSERC, Genome Canada, the Ontario Genomics Institute and the International Barcode of Life; Universidad Nacional de La Plata (11/N896); the Comisión de Investigaciones Científicas de la provincia de Buenos Aires (Res. 597/16), Argentina; CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (process 13741-12-8); and the CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico (process 480180/2011-3).
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Locke, S.A., Drago, F.B., Núñez, V. et al. Phylogenetic position of Diplostomum spp. from New World herons based on complete mitogenomes, rDNA operons, and DNA barcodes, including a new species with partially elucidated life cycle. Parasitol Res 119, 2129–2137 (2020). https://doi.org/10.1007/s00436-020-06713-4
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DOI: https://doi.org/10.1007/s00436-020-06713-4