Retroporomonorchis pansho n. g., n. sp., an unusual monorchiid trematode exploiting an atypical host
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Retroporomonorchis pansho n. g., n. sp., an unusual monorchiid trematode exploiting an atypical host Nicholas Q.-X. Wee Storm B. Martin
. Thomas H. Cribb
. Scott C. Cutmore
.
Received: 29 April 2020 / Accepted: 7 July 2020 Ó Springer Nature B.V. 2020
Abstract The Monorchiidae Odhner, 1911 are well represented in tropical and subtropical marine fishes worldwide but rarely reported from the Lutjanidae, an important family of tropical fishes that prey mainly on demersal fishes, decapods and cephalopods. Here, we report the first monorchiid from a lutjanid in Australian waters, Retroporomonorchis pansho n. g., n. sp. in Lutjanus fulvus (Forster), off Lizard Island on the northern Great Barrier Reef. It is morphologically and phylogenetically distinct among known monorchiids, resolves within the Monorchiinae Odhner, 1911, and is characterised by a relatively large ventral sucker, a sinistral genital pore immediately posterior to the ventral sucker, unfilamented eggs, a single testis, and vitelline follicles restricted to the level of the gonads. We assessed all previous records of monorchiids from lutjanid fishes and found only one to be convincing, This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as urn:lsid:zoobank.org:pub:1FE1714A-3A57-4E38-998E7B1E4042A7B7. 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. N. Q.-X. Wee (&) T. H. Cribb S. C. Cutmore S. B. Martin School of Biological Sciences, The University of Queensland, Brisbane, QLD 4072, Australia e-mail: [email protected]
that of Infundiburictus overstreeti (Gupta & Gupta, 1990) Wee, Cutmore, Pe´rez-del-Olmo & Cribb, 2020 from Lutjanus monostigma (Cuvier) in the Bay of Bengal. Another, Monorcheides xishaensis Shen, 1985, from Lutjanus argentimaculatus (Forsska˚l) in the Paracel Islands, South China Sea, is here recognised as a cryptogonimid, and is synonymised with Siphoderina asiatica Gu & Shen, 1979. In the remaining reports, the identity of the host is either ambiguous or doubtful, or the identity of the worm is not supported with sufficient evidence.
Introduction The Lutjanidae (Perciformes) is a diverse family of ecologically and commercially significant, mediumlarge, tropical and subtropical marine fishes found worldwide. The group comprises about 21 genera and 137 species, and includes the snappers, fusiliers and jobfishes. Lutjanids are mostly active predators of demersal and benthic fishes, and some invertebrates, especially cephalopods and decapod crustaceans (Allen, 1985; Rooker, 1995; Duarte & Garcı´a, 1999; Gobert et al., 2005). Most species are associated with coral reefs or inshore waters, although some typically occur at greater depths (Allen, 1985). Lutjanids are host to a wide variety of endoparasitic trematodes. To our knowledge, trematodes from m
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