Abstract
A new genus of trypanorhynch cestodes, Pristiorhynchus n. g. (Otobothrioidea: Otobothriidae), is described from two species of modern sawfishes (Pristidae) from off northern Australia. Pristiorhynchus palmi n. g., n. sp. is characterised by an acraspedote scolex with two bothria, paired bothrial pits on the posterior margins of each bothrium, the absence of gland-cells within the bulbs and prebulbar organs, a retractor muscle inserting at the posterior region of the elongate bulbs, a characteristic basal tentacular armature with dispersed billhooks and a heteroacanthous atypical metabasal armature with five principle and three intercalary hooks. Furthermore, redescriptions are provided for Symbothriorhynchus tigaminacantha Palm, 2004, Parotobothrium balli (Southwell, 1929) and Pseudotobothrium arii (Bilqees & Shaukat, 1976). Observations of adult worms revealed novel information on the segment morphology, which has not been described for these three species. Specimens of Proemotobothrium linstowi (Southwell, 1924), Pr. southwelli Beveridge & Campbell, 2001 and Fossobothrium perplexum Beveridge & Campbell, 2005 collected from elasmobranchs from several sampling localities off Australia revealed additional information on host range and geographical distribution.
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Acknowledgements
We are very grateful to Prof. Janine N. Caira (University of Connecticut) and Dr Kirsten Jensen (University of Kansas) for the collection of material from off northern Australia and Borneo and for making it available for the present study. We are also grateful to Bruce Robertson for his extensive collecting efforts off Queensland, Western Australia and the Northern Territory and to J. Reddick for collecting specimens at Heron Island. The specimens from off New Caledonia were collected by M. Labrosse and kindly provided by Prof. Louis Euzet. BCS is very grateful to Joan Clark (Monash Micro Imaging) for SEM examination of specimens and to Christine Andersen (University of Melbourne) for technical assistance. This study was supported by the Australian Society for Parasitology (Network Researcher Exchange, Training and Travel Award awarded to BCS). Collecting in Malaysian Borneo was supported financially by the National Science Foundation (NSF) (PBI award Nos 0818696 and 0818823; BS&I award Nos DEB 0103640, DEB 0542941 and DEB 0542846). Collecting in the Gulf of Carpenteria was funded by the NSF (PEET award Nos DEB 0118882 and DEB 9521943) and in other parts of Australia by the Australian Biological Resources Study.
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Schaeffner, B.C., Beveridge, I. Pristiorhynchus palmi n. g., n. sp. (Cestoda: Trypanorhyncha) from sawfishes (Pristidae) off Australia, with redescriptions and new records of six species of the Otobothrioidea Dollfus, 1942. Syst Parasitol 84, 97–121 (2013). https://doi.org/10.1007/s11230-012-9391-6
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DOI: https://doi.org/10.1007/s11230-012-9391-6