Polyclad turbellarians collected on the Osaka University Expedition to Viti Levu,Fiji, in 1985, with remarks on distribution and phylogeny of the genus Discoplana |
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Authors: | Ken-Ichi Tajika Uday Raj Shinri Horiuchi Yutaka Koshida |
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Institution: | (1) Department of Biology, Nihon University School of Medicine, Oyaguchi, 173 Itabashi, Tokyo, Japan;(2) Institute of Marine Resources, The University of the South Pacific, Suva, Fiji;(3) Department of Biology College of General Education, Osaka University, 560 Toyonaka, Osaka, Japan |
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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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Keywords: | Polycladida Discoplana distribution phylogeny Fiji |
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