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Restudy of a Miocene Bryozoan Species, Microporina articulata notoensis Sakakura, 1936 with Description of Another New Species from the Nanao Calcareous Sandstone
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Abstract
Abstract.
Microporina articulata notoensis
Sakakura, 1936
, from the Nanao Calcareous Sandstone (Middle Miocene) was restudied and raised to species rank, mainly based on the orifice morphology. Sakakura interpreted small depressions along lateral sides of the cryptocyst as additional opesiules, but it is not clear whether they function as opesiules or not, based on the SEM image. This and other Neogene to Recent Microporina species in Japan are compared, and one more species, Microporina iwayaensis sp. nov. is erected.
Received 21 6月 2021
Accepted 20 1月 2022
Acknowledgments:
I would like to express deep thanks to Matthew H. Dick (Hokkaido University) for critical advice on the manuscript, and Shuji Kokubu (Nanao Nojiriko Tomo-no-kai) for supplying the study material. I also thank Yasunari Shigeta and Takuma Haga (National Museum of Nature and Science, Tsukuba) for permission to use the SEM and also for cataloging and storing the study material in the museum.
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