Pseudohurleytrema yolandae n. sp., the first monorchiid trematode reported from the Triacanthidae (Tetraodontiformes)
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Pseudohurleytrema yolandae n. sp., the first monorchiid trematode reported from the Triacanthidae (Tetraodontiformes) Nicholas Q.-X. Wee
. Kristine Crouch . Scott C. Cutmore
. Thomas H. Cribb
Received: 24 April 2020 / Accepted: 20 June 2020 Ó Springer Nature B.V. 2020
Abstract Prior to the present study, species of the trematode family Monorchiidae Odhner, 1911 had been reported from four of the ten families of tetraodontiform fishes: the Balistidae, Monacanthidae, Ostraciidae and Tetraodontidae. Here we report the first monorchiid from the family Triacanthidae, Pseudohurleytrema yolandae n. sp. infecting Tripodichthys angustifrons (Hollard), from Moreton Bay, Queensland, Australia. The species conforms well to the morphological concept of the subfamily Hurleytrematinae Yamaguti, 1958, and the genus Pseudohurleytrema Yamaguti, 1954, in the possession of filamented eggs, a bipartite terminal organ, and a unipartite seminal vesicle. Relative to the other three recognised species of Pseudohurleytrema, the present species is distinctive in the size of the testis and eggs, position of the ovary, and the form of the vitellarium This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as urn:lsid:zoobank.org:pub:D6729A5F-74C0-4068-A8D1CFFB6FD5F810. This article was published as an Online First article on the online publication date shown on this page. The article should be cited using the doi number. This is the Version of Record. This article is part of the Topical Collection Digenea. N. Q.-X. Wee (&) K. Crouch S. C. Cutmore T. H. Cribb School of Biological Sciences, The University of Queensland, Brisbane, St Lucia, QLD 4072, Australia e-mail: [email protected]
and excretory vesicle. We consider Pseudohurleytrema magnum Kaikabad & Bilqees in Bilqees, 1991 as a species inquirenda. Sequence data for the 28S ribosomal RNA gene and cox1 mitochondrial gene were generated for P. yolandae, providing the first molecular data for the genus. Phylogenetic analysis showed that P. yolandae does not form a clade with the other three hurleytrematine genera for which there are molecular data (Helicometroides Yamaguti, 1934, Hurleytrematoides Yamaguti, 1953 and Provitellus Dove & Cribb, 1998), forming a poorly-supported clade with Proctotrema addisoni Searle, Cutmore & Cribb, 2014 within the clade of the subfamily Monorchiinae Odhner, 1911. The four hurleytrematine genera resolved as four distinct clades, indicating that the current subfamilial classification requires comprehensive revision.
Introduction The Triacanthidae (Tetraodontiformes) is a small family of marine fishes restricted to the Indo-Pacific (Froese & Pauly, 2019). The group comprises only four genera and seven species: Tripodichthys Tyler with three species, Triacanthus Cuvier with two species, and two monotypic genera, Trixiphicthys Fraser-Brunner and Pseudotriacanthus Fraser-Brunner. Triacanthids typically inhabit shallow sandy and muddy flats in coastal waters, although th
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