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Nolan, M J; Cantacessi, C; Cutmore, S C; Cribb, T H; Miller, T L (2016)
Publisher: Parasitology International
Languages: English
Types: Article
Subjects: apogonidae, platyhelminthes, host-switching, trematoda, internal transcribed spacer 2 (ITS2) of the ribosomal DNA (rDNA)
We report a new species of aporocotylid trematode (Platyhelminthes: Digenea) from the heart of the orangelined cardinalfish, Taeniamia fucata (Cantor), from off Heron Island on the southern Great Barrier Reef. We used an integrated approach, analysing host distribution, morphology, and genetic data from the internal transcribed spacer 2 of the ribosomal DNA, to circumscribe Phthinomita heinigerae n. sp. This is the first species of Phthinomita Nolan & Cribb, 2006 reported from the Apogonidae; existing species and known ‘types’ are recorded from species of the Labridae, Mullidae, and Siganidae. The new species is distinguished from its 11 congeners in having a body 2977–3539 long and 16.5–22.4 times longer than wide, an anterior testis 6.2–8.2 times longer than wide and 8.3– 13.0 times longer than the posterior testis, a posterior testis whose width is 35–56% of the body width, and an ovary positioned 11–13% of the body length from the posterior end, and is entirely anterior to the posterior margin of the anterior testis. In addition, 2–34 base differences (0.4–7.0% sequence divergence over 485 base positions) were detected among the ITS2 sequence representing P. heinigerae n. sp. and the 14 representing other Phthinomita species/molecular types. Prevalence and intensity of infection with P. heinigerae n. sp. was relatively high within the heart tissue of T. fucata, with 19 of 20 fish examined from off Heron Island infected (95%) with 7– 25 adult worms (arithmetic mean 16.6). Infections by these parasites accounted for an occupation of 7–30% of the total estimated heart volume. This is the author accepted manuscript. The final version is available from Elsevier via http://dx.doi.org/10.1016/j.parint.2016.05.006
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