Lower Cretaceous Conchostracans of SW Japan

Abstract

Four species of Yanjiestheria and a new species Neodiestheria yamajiensis sp. n. from the Inakura Formation at Yamaji of Ibara City, Okayama Prefecture have been first described in this paper. Three conchostracan forms from the Wakino Subgroup in Kokura area, Kitakyushu City have been restudied and revised in taxa. They are Orthestheria kokurensis (Kusumi), Orthestheriopsis imamurai (Kusumi), and O. wakinoica sp. n. Based on this research, the correlation of the Lower Cretaceous volcano-sedimentary strata has been rediscussed.