Thalassiocyclus pankensis sp. nov., a new diatom from the Panke Swamp, northern Japan (Bacillariophyta) |
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Authors: | Hiroyuki Tanaka Tamotsu Nagumo |
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Affiliation: | Department of Biology, The Nippon Dental University, Chiyoda-ku, Tokyo, 102-8159, Japan |
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Abstract: | Thalassiocyclus pankensis sp. nov. is described from Panke Swamp (Panke-numa) located in Horonobe Town, Hokkaido, northern Japan. The species is characterized by a strong transversely undulate central area of the valve face with one to three fultoportulae on the elevated part and one fultoportula on the depressed part. The external valve face has costate radial interfascicles and very wide fascicles on the marginal area. Thickened openings of mantle fultoportulae are located at the end of interfascicles with roofed board spines. The cingulum consists of five bands. The new species is compared to the only other species belonging to genus Thalassiocyclus , T. lucens (Hustedt) Håkansson & Mahood. Thalassiocyclus pankensis is the second species in the genus Thalassiocyclus and also the first report of a Thalassiocyclus species in Japan. |
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Keywords: | brackish water diatom Japan new species Panke Swamp Thalassiocyclus pankensis |
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