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Expansion of the concept of the Opistholebetinae Fukui, 1929 (Digenea: Opecoelidae Ozaki, 1925), with Magnaosimum brooksae n. g., n. sp. from Tripodichthys angustifrons (Hollard) (Tetraodontiformes: Triacanthidae) in Moreton Bay, Australia

Abstract

The Opecoelidae Ozaki, 1925, the largest trematode family, currently lacks an adequate subfamilial organisation. In particular, recent analyses have shown that the sequenced representatives of the Opistholebetinae Fukui, 1929 are nested among taxa currently recognised in the Plagioporinae Manter, 1947, which itself is polyphyletic. The concept of the Opistholebetinae persists because its 25 or so species are united by a distinctive morphology and a narrow host range; species are known only from tetraodontiform fishes, specifically of the Tetraodontidae and Diodontidae, and possess a muscular post-oral ring, unusual pigmented granules throughout the body and a ventral sucker positioned more posteriorly than is typical for other opecoelids. Here we report on Magnaosimum brooksae n. g., n. sp. from a tetraodontiform, Tripodichthys angustifrons (Hollard) (Triacanthidae), collected in Moreton Bay, Australia. The new species has a longer forebody than hindbody, but lacks a post-oral ring and pigmented granules. It resolves to the plagioporine clade containing the Opistholebetinae, but does not form a monophyletic grouping with those taxa. We propose to expand the concept of the Opistholebetinae to include Magnaosimum, as well as Gaevskajatrema Gibson & Bray, 1982, Macvicaria Gibson & Bray, 1982, Pachycreadium Manter, 1954, Peracreadium Nicoll, 1909, Pinguitrema Siddiqi & Cable, 1960, Propycnadenoides Fishcthal & Kuntz, 1964, Pseudopycnadena Saad-Fares & Maillard, 1986, Pycnadena Linton, 1911 and Pycnadenoides Yamaguti, 1938.

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Acknowledgements

We thank John Page and Dave Thomson, local fishermen who have generously facilitated our research efforts in Moreton Bay for this and other projects; the staff of Moreton Bay Research Station for their continued support of our research efforts; and the colleagues and students who assisted with field work.

Funding

SBM is supported by The Holsworth Wildlife Research Endowment administered by The Ecological Society of Australia, and by a PhD scholarship provided through the Australian Government’s Australian Biological Resources Study (ABRS) National Taxonomy Research Grant Programme (NTRGP), grant number CT215-14. Collection within Moreton Bay was funded by an ABRS grant (RF215-40) awarded to SCC and THC.

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Correspondence to S. B. Martin.

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This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as 018F8C19-7CED-4E7E-8E5E-0B67314BB390. This article was published as an Online First article on the online publication date shown on this page. The article should be cited by using the doi number. This is the Version of Record.

This article is part of the Topical Collection Digenea.

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Martin, S.B., Crouch, K., Cutmore, S.C. et al. Expansion of the concept of the Opistholebetinae Fukui, 1929 (Digenea: Opecoelidae Ozaki, 1925), with Magnaosimum brooksae n. g., n. sp. from Tripodichthys angustifrons (Hollard) (Tetraodontiformes: Triacanthidae) in Moreton Bay, Australia. Syst Parasitol 95, 121–132 (2018). https://doi.org/10.1007/s11230-018-9783-3

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