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Retroporomonorchis pansho n. g., n. sp., an unusual monorchiid trematode exploiting an atypical host

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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, that of Infundiburictus overstreeti (Gupta & Gupta, 1990) Wee, Cutmore, Pérez-del-Olmo & Cribb, 2020 from Lutjanus monostigma (Cuvier) in the Bay of Bengal. Another, Monorcheides xishaensis Shen, 1985, from Lutjanus argentimaculatus (Forsskål) 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.

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Acknowledgements

We sincerely thank the members of the Marine Parasitology Laboratory for their support and assistance with the collection of host specimens. We also thank the staff of Lizard Island Research Station for their support of our work.

Funding

This project was supported by the Holsworth Wildlife Research Endowment & The Ecological Society of Australia, and the PADI Foundation through funds awarded to NW. NW is supported by a PhD scholarship from the University of Queensland (Research Training Program (RTP) Scholarship). SCC and THC are supported by the Australian Biological Resources Study (ABRS National Taxonomy Research Grant RG19-37).

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  1. School of Biological Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia

    Nicholas Q.-X. Wee, Thomas H. Cribb, Scott C. Cutmore & Storm B. Martin

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Wee, N.QX., Cribb, T.H., Cutmore, S.C. et al. Retroporomonorchis pansho n. g., n. sp., an unusual monorchiid trematode exploiting an atypical host. Syst Parasitol 97, 441–454 (2020). https://doi.org/10.1007/s11230-020-09926-4

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