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1 October 2014 Pararigbyella and Dicystoconcha (Lyttoniidina, Brachiopoda) from the Middle Permian (Wordian) of Japan
Shu-Zhong Shen, Jun-Ichi Tazawa
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Permianellids are a specialized fossil group of Brachiopoda characterized by a complicated forking lobe system. In this paper, we report two permianellid species (Pararigbyella doulingensis Shen and Zhang, 2008 and Dicystoconcha lapparenti Termier and Termier in Termier et al., 1974), from the middle Guadalupian (Wordian, middle Permian) of the Kamiyasse-Imo area, South Kitakami Belt, Northeast Japan, of which Pararigbyella doulingensis is the first record in Japan. A global review of all occurrences of the two genera suggests that Pararigbyella is restricted to the Cathaysian Province, while Dicystoconcha is mainly distributed in the Paleotethyan region and the two transitional zones between the Boreal or Gondwanan and Paleotethyan realms.

© by the Palaeontological Society of Japan
Shu-Zhong Shen and Jun-Ichi Tazawa "Pararigbyella and Dicystoconcha (Lyttoniidina, Brachiopoda) from the Middle Permian (Wordian) of Japan," Paleontological Research 18(4), 245-249, (1 October 2014).
Received: 24 December 2013; Accepted: 1 April 2014; Published: 1 October 2014
South Kitakami Belt
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