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1 April 2005 Praeorbitolinoides, a new Orbitolinid foraminiferal genus from the Lower Aptian (Cretaceous) of Hokkaido, Japan
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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).

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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