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Praeorbitolinoides, a new Orbitolinid foraminiferal genus from the Lower Aptian (Cretaceous) of Hokkaido, Japan

Department of Geology, Faculty of Education, Saitama University, Saitama 338 8570, Japan, e-mail: matsumar{at}post.saitama-u.ac.jp

A new Orbitolinid foraminiferal genus Praeorbitolinoides (type species Praeorbitolinoides japonica, n. gen., n. sp.) is described from the Lower Aptian Orbitolina-bearing limestone, Shimanoshita Mudstone, Lower Yezo Group, Hokkaido, Japan. Praeorbitolinoides, gen. nov. is characterized by the presence of early postembryonic chambers, covering on the embryonic and periembryonic chambers, eccentric in position. Praeorbitolinoides japonica, n. gen., n. sp. is associated with Paleorbitolina lenticularis (Blumenbach) and Mesorbitolina parva (Douglass).

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