Taxonomic revision of Choffatella singularis Magniez-Jannin, 1989, from the Lower Cretaceous of the Paris Basin, France and description of the new genus Magniezjanninius

Abstract

Choffatella singularis was described from the Hauterivian of the Paris Basin based on abundant isolated specimens and oriented thin-sections enabling a very detailed description. Although an alveolar wall-structure was mentioned in the original description, the new species was assigned to Choffatella Schlumberger that lacks this feature, instead displaying a fine and regular choffatellid subepidermal network. This feature instead would refer to Pseudocyclammina Yabe and Hanzawa that however has a different apertural type. To accommodate Ch. singularis into the current classification of agglutinated benthic foraminifera and its basic criteria, the new genus Magniezjanninius is established including the new combination M. singularis (Magniez-Jannin).