Abstract
We provide molecular data (cox1, 18S rDNA and 28S rDNA) for 17 acanthocephalan species and 20 host-parasite combinations from Australian marine teleosts collected from off Queensland, Australia. Fourteen of these acanthocephalans are characterised with molecular data for the first time and we provide the first molecular data for a species of each of the genera Heterosentis Van Cleave, 1931, Pyriproboscis Amin, Abdullah & Mhaisen, 2003 and Sclerocollum Schmidt & Paperna, 1978. Using 18S and 28S rDNA sequences, the phylogenetic position of each newly sequenced species is assessed with both single-gene and concatenated 18S+28S maximum likelihood and Bayesian inference analyses. Additional phylogenetic analyses focusing on the genus Rhadinorhynchus Lühe, 1912 and related lineages are included. Our phylogenetic results are broadly consistent with previous analyses, recovering previously identified inconsistencies but also providing new insights and necessitating taxonomic action. We do not find sufficient evidence to recognise the Gymnorhadinorhynchidae Braicovich, Lanfranchi, Farber, Marvaldi, Luque & Timi, 2014 as distinct from the Rhadinorhynchidae Lühe, 1912. The family Gymnorhadinorhynchidae and its sole genus, Gymnorhadinorhynchus Braicovich, Lanfranchi, Farber, Marvaldi, Luque & Timi, 2014, are here recognised as junior synonyms of Rhadinorhynchidae and Rhadinorhynchus, respectively. The two species currently assigned to Gymnorhadinorhynchus are recombined as Rhadinorhynchus decapteri (Braicovich, Lanfranchi, Farber, Marvaldi, Luque & Timi, 2014) n. comb. and Rhadinorhynchus mariserpentis (Steinauer, Garcia-Vedrenne, Weinstein & Kuris, 2019) n. comb. In all of our analyses, Rhadinorhynchus biformis Smales, 2014 is found basal to the Rhadinorhynchidae + Transvenidae Pichelin & Cribb, 2001, thus resulting in a paraphyletic Rhadinorhynchidae. It appears that R. biformis may require a new genus and family; however, morphological data for this species are currently insufficient to adequately distinguish it from related lineages, thus we defer the proposal of any new higher-rank names for this species. Species of the genus Sclerocollum, currently assigned to the Cavisomidae Meyer, 1932, are found nested within the family Transvenidae. We transfer the genus Sclerocollum to the Transvenidae and amend the diagnosis of the family accordingly. The genera Gorgorhynchoides Cable & Linderoth, 1963 and Serrasentis Van Cleave, 1923, currently assigned to the Rhadinorhynchidae, are supported as sister taxa and form a clade in the Polymorphida. We transfer these genera and Golvanorhynchus Noronha, Fabio & Pinto, 1978 to an emended concept of the Isthomosacanthidae Smales, 2012 and transfer this family to the Polymorphida. Lastly, Pyriproboscis heronensis (Pichelin, 1997) Amin, Abdullah & Mhaisen, 2003, currently assigned to the Pomphorhynchidae Yamaguti, 1939, falls under the Polymorphida in our analyses with some support for a sister relationship with the Centrorhynchidae Van Cleave, 1916. As this species clearly does not belong in the Pomphorhynchidae and is morphologically and molecularly distinct from the lineages of the Polymorphida, we propose the Pyriprobosicidae n. fam. to accommodate it.
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25 August 2020
Shortly after publication it was brought to authors��� attention that two of the��cox1 sequences reported in the study, those of Neoechinorhynchus tylosuri (MN692675) and Transvena annulospinosa (MN692690) were potentially erroneous. After investigation, it was determined that this was indeed the case and was caused by contamination of original sequencing results. They were found to be near-duplicates of other species from the same sequencing batch. These sequences have been removed from GenBank. Unfortunately, this means that no cox1 sequence data were provided for the above two species in the referenced study. The remaining cox1 sequences reported have been checked and are reliable. Furthermore, cox1 sequence data were not analysed as part of the study, and thus the above error does not affect the results or conclusions of the study. Corrections to the text in reference to the above are made in Table��1 (removal of the above GenBank accession numbers), on page 10 (���Sequence data for all three targeted markers were obtained for 13 (rather than 15) of the 17 acanthocephalan species studied���) and on page 19 (���We generated new cox1 sequence data for all but three (rather than one) of the acanthocephalan species from our collection������).
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Acknowledgments
We thank the staff of the Lizard Island (Australian Museum), Heron Island and Moreton Bay (University of Queensland) research stations for their ongoing support of our work. We thank Dr Scott Cutmore and the many students of the Marine Parasitology Laboratory at the University of Queensland who have assisted in the collection of specimens over the years. We thank two anonymous reviewers for their constructive criticisms which improved the content of the manuscript.
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This work was funded in part by grants from the Holsworth Wildlife Research Endowment, PADI foundation and Systematics Research Fund to DCH. Collection within Moreton Bay was part of a larger effort to characterise the metazoan parasite fauna of fishes from that region, funded by an ABRS grant (RF215-40) awarded to THC and Dr Scott Cutmore (University of Queensland).
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Huston, D.C., Cribb, T.H. & Smales, L.R. Molecular characterisation of acanthocephalans from Australian marine teleosts: proposal of a new family, synonymy of another and transfer of taxa between orders. Syst Parasitol 97, 1–23 (2020). https://doi.org/10.1007/s11230-019-09896-2
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DOI: https://doi.org/10.1007/s11230-019-09896-2