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

Kuniteru Matsumaru

doi:10.1661/0026-2803(2005)051[0093:PANOFG]2.0.CO;2

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Kuniteru Matsumaru¹

¹Department of Geology, Faculty of Education, Saitama University, Saitama 338 8570, Japan, matsumar@post.saitama-u.ac.jp

Abstract

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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Kuniteru Matsumaru "Praeorbitolinoides, a new Orbitolinid foraminiferal genus from the Lower Aptian (Cretaceous) of Hokkaido, Japan," Micropaleontology 51(1), 93-99, (1 April 2005). https://doi.org/10.1661/0026-2803(2005)051[0093:PANOFG]2.0.CO;2

Received: 12 December 2004; Accepted: 1 January 2005; Published: 1 April 2005

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