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Three new species of Helicometroides Yamaguti, 1934 from Japan and Australia, with new molecular evidence of a widespread species

Published online by Cambridge University Press:  26 January 2022

Nicholas Q-X. Wee Open the ORCID record for Nicholas Q-X. Wee [Opens in a new window] ,
Thomas H. Cribb Open the ORCID record for Thomas H. Cribb [Opens in a new window] ,
Sho Shirakashi Open the ORCID record for Sho Shirakashi [Opens in a new window]  and
Scott C. Cutmore Open the ORCID record for Scott C. Cutmore [Opens in a new window]
Nicholas Q-X. Wee*
Affiliation:
School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia
Thomas H. Cribb
Affiliation:
School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia
Sho Shirakashi
Affiliation:
Aquaculture Research Institute, Kindai University, Shirahama 3153, Nishimuro, Wakayama 649-2211, Japan
Scott C. Cutmore
Affiliation:
School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia
*
Author for correspondence: Nicholas Q-X. Wee, E-mail: [email protected]
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Abstract

We report specimens of monorchiids infecting Haemulidae from the waters off Japan and Australia; these specimens represent five species of Helicometroides Yamaguti, 1934, three of which are unambiguously new. Helicometroides murakamii n. sp. infects Diagramma pictum pictum from off Minabe, Japan; Helicometroides gabrieli n. sp. infects Plectorhinchus chrysotaenia from off Lizard Island, Australia; and Helicometroides wardae n. sp. infects Plectorhinchus flavomaculatus and Plectorhinchus multivittatus from off Heron Island, Australia. Helicometroides murakamii n. sp. and H. gabrieli n. sp. conform to the most recent diagnosis of Helicometroides in lacking a terminal organ, but H. wardae n. sp. possesses a terminal organ with distinct, robust spines; despite this morphological distinction, the three form a strongly-supported clade in phylogenetic analyses. We also report specimens morphologically consistent with Helicometroides longicollis Yamaguti, 1934, from D. pictum pictum from off Minabe, Japan, and Diagramma pictum labiosum on the Great Barrier Reef, Australia. Genetic analyses of ITS2 rDNA, 28S rDNA and cox1 mtDNA sequence data for the Japanese specimens reveal the presence of two distinct genotypes. Specimens of the two genotypes were discovered in mixed infections and are morphologically indistinguishable; neither genotype can be associated definitively with H. longicollis as originally described. We thus identify them as H. longicollis lineage 1 and 2, pending study of further fresh material. Genetic analyses of specimens from the Great Barrier Reef are consistent with the presence of only H. longicollis lineage 1. This species thus has a range that incorporates at least Australia and Japan, localities separated by over 7000 km.

Keywords

Cryptic speciesHelicometroidesMonorchiidaesystematicstaxonomytropical Indo-west Pacific
Type
Research Article
Information
Parasitology , Volume 149 , Issue 5 , April 2022 , pp. 622 - 639
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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