Cryptic species of <Emphasis Type="Italic">Euryakaina</Emphasis> n. g. (Digenea: Cryptogonimidae) from sympatric lutjanids in the Indo-West Pacific |
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Authors: | Terrence L Miller Robert D Adlard Rodney A Bray Jean-Lou Justine Thomas H Cribb |
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Institution: | 1.Biodiversity Program,Queensland Museum,South Brisbane,Australia;2.School of Chemistry and Molecular Biosciences,The University of Queensland,Brisbane,Australia;3.Department of Zoology,Natural History Museum,London,UK;4.UMR 7138 Systématique, Adaptation, évolution, Muséum National d’Histoire Naturelle,Paris Cedex 05,France;5.Aquarium des Lagons,Nouméa,New Caledonia |
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Abstract: | A survey of the endohelminth fauna of Indo-West Pacific Lutjanidae (Perciformes) revealed the presence of the species Siphoderina manilensis (Velasquez, 1961) Miller & Cribb, 2008 and S. marina (Hafeezullah & Siddiqi, 1970) Miller & Cribb, 2008 in seven Lutjanus spp. from sites off the Great Barrier Reef, the Maldives, New Caledonia and Ningaloo Reef, Western Australia. A combination
of morphological and ribosomal DNA analyses of these cryptogonimids prompted the transfer of these taxa to a new genus, Euryakaina n. g., as E. manilensis n. comb. and E. marina n. comb., based on comparative analysis with other cryptogonimid taxa. Euryakaina n. g. is distinguished from all other cryptogonimid genera by the combination of a fusiform body, the few relatively small,
widely spaced oral spines (sometimes absent), a highly lobed ovary, opposite to slightly oblique testes, vitelline follicles
that extend from the anterior margin of the testes to slightly posterior to the intestinal bifurcation, and an excretory vesicle
that bifurcates dorsal to the ovary and reunites briefly slightly posterior to the intestinal bifurcation. Morphometric analysis
of these taxa alone suggests they should be reduced to synonymy, but DNA sequence analyses and ecological niche partitioning
provide evidence that they form a cryptic species complex in sympatric lutjanids in the Indo-West Pacific. The secondary structure
of the ITS2 rDNA for species of Euryakaina was also modelled and analysed for the presences of compensatory base changes (CBCs) or hemi-CBCs in order to explore the
usefulness of these changes as a tool to help elucidate the taxonomy of this complex system. We also report what we interpret
here as intraspecific variation in the ITS2 rDNA between individuals of E. manilensis from Lutjanus vitta recovered off the Great Barrier Reef and New Caledonia. |
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