<i>Stephanodiscus uemurae</i>, a new Mio-Pliocene diatom species from the Miyata Formation, Akita Prefecture, northern Honshu, Japan
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- TANAKA Hiroyuki
- Maebashi Diatom Institute
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- NAGUMO Tamotsu
- Department of Biology, The Nippon Dental University
Bibliographic Information
- Other Title
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- 本州北部,秋田県の宮田層から見出された中新−鮮新世の新種珪藻<i>Stephanodiscus uemurae</i>
- Stephanodiscus uemurae, a new Mio-Pliocene diatom species from the Miyata Formation, Akita Prefecture, northern Honshu, Japan
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Abstract
A recently found Stephanodiscus fossil, S. uemurae sp. nov., from Mio-Pliocene sediment of the Miyata Formation, Senboku City, Akita Prefecture, northern Honshu, Japan is described here. The new species is characterized by having a slightly double concentric undulation of the valve face, uniseriate fascicles at the valve center and biseriate or triseriate fascicles at the valve face/mantle junction. There is often a slight break between the rows of areolae on the valve face and mantle. Usually, there are no valve face fultoportulae. Spines are located on all interfascicles at valve face/mantle junction except in the case where openings of mantle fultoportulae are present, which is usually every two or three interfascicles. One tubular rimoportula replaces a spine and is located slightly above the ring of spines. The new species is illustrated with LM and SEM photographs.
Journal
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- Diatom
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Diatom 25 (0), 45-51, 2009
The Japanese Society of Diatomology
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Details 詳細情報について
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- CRID
- 1390001205502091520
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- NII Article ID
- 10029531124
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- NII Book ID
- AA11130739
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- ISSN
- 21868565
- 09119310
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- NDL BIB ID
- 10546002
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed