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1 October 2013 A New Species of Provanna (Gastropoda: Provannidae) from an Oligocene Seep Deposit in Eastern Hokkaido, Japan
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Abstract

We describe a new species, Provanna urahoroensis sp. nov. from seep carbonates of the lower Oligocene Nuibetsu Formation in eastern Hokkaido, Japan. The new species is the second fossil record of Provanna from Paleogene rocks and resembles a smooth variant of the American Paleogene species, P. antiqua Squires, in having a smooth shell with very weak spiral cords. Based on its association with Bathymodiolus (s. l.), fossil Provanna including the new species possibly grazed preferably on bacteria on the surface of Bathymodiolus (s. l.) and of exposed carbonates.

© by the Palaeontological Society of Japan
Kazutaka Amano and Robert G. Jenkins "A New Species of Provanna (Gastropoda: Provannidae) from an Oligocene Seep Deposit in Eastern Hokkaido, Japan," Paleontological Research 17(4), (1 October 2013). https://doi.org/10.2517/1342-8144-17.4.325
Received: 13 December 2012; Accepted: 1 March 2013; Published: 1 October 2013
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