Abstract
We report the first records from Viti Levu, Fiji, for four species of polyclad turbellarians: Discoplana gigas (Schmarda), Paraplanocera oligoglena (Schmarda), Cestoplana cuneata Sopott-Ehlers et Schmidt, and Pericelis byerleyana (Collingwood). D. gigas has the widest distribution in the Indo-West Pacific among the six described species of Discoplana, and shows a wider range of color variation than has been attributed to it before. Analysis of morphological features in these species reveals that Discoplana can be divided hierarchically into several sister-species groups based upon differences in structure of the vagina and of the penis. Four species, occurring mainly in the Pacific, share an apomorphic feature of the vagina, a feature not seen in the other two from the Indian Ocean. This suggests that Discoplana originated in the Indo-West Pacific.
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Tajika, KI., Raj, U., Horiuchi, S., Koshida, Y. (1991). Polyclad turbellarians collected on the Osaka University Expedition to Viti Levu, Fiji, in 1985, with remarks on distribution and phylogeny of the genus Discoplana . In: Tyler, S. (eds) Turbellarian Biology. Developments in Hydrobiology 69, vol 69. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2775-2_46
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DOI: https://doi.org/10.1007/978-94-011-2775-2_46
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