The examination of unilocular tests of foraminifera belonging to the subfamily Lageninae and collected in Plio-Pleistocene littoral deposits from north-western France, and Fécamp (Seine-Maritime, France) as well as from St Erth (Cornwall, United Kingdom), shows a great specific diversity. A diagnosis of the subfamily Lageninae is proposed. The observation shows the perforate character of the wall and the presence of a small aboral opening which corresponds generally to a short internal tube (aboral end structure). Most of the examined specimens being well-preserved, sixty-three species have been described including twenty-one in open nomenclature. They are assigned to the existing genera Hyalinonetrion, Lagena and Pygmaeseistron, Height new genera are proposed: Deuteralagena n. gen., Fususella n. gen., Hyalinonetrionella n. gen., Laevilagena n. gen., Lagunculella n. gen., Lanternalagena n. gen., Malumella n. gen. and Verulagena n. gen. If the genus Lagena had a wide geographical and stratigraphical distribution, the genera Fususella and Hyalinonetrionella n. gen. are limited to the Early Pliocene of the Ligerian Gulf and the genus Hyalinonetrion to the Upper Pliocene from the Carentan Basin. The other genera are essentially present in the Early Pliocene from the Ligerian Gulf. The specimens’s collection is housed in MNHN.
Lageninae, Early Pliocene-Early Pleistocene, north-western France, Fécamp, Seine-Maritime, France, St Erth, Cornwall, United Kingdom, Foraminifera, unilocular, aboral end structure, new combinations, new genera, new species