Fususella basirotunda, Margerel, 2023

Margerel, Jean-Pierre, 2023, The species of Lageninae Brady, 1881 (Foraminifera) from the Pliocene-Early Pleistocene of north-western France, Fécamp (Seine-Maritime, France) and St Erth (Cornwall, United Kingdom), Geodiversitas 45 (1), pp. 1-53 : 6-10

Fususella basirotunda n. gen., n. sp. ( Figs 5 D-P; 30C-F)

urn:lsid:zoobank.org:act:716CEB84-5DC9-43A7-804C-0CBBBC4F8C0D

HOLOTYPE. — Sample: la Pugle, 8.00 m (MNHN.F.F67621).

PARATYPES. — Two paratypes: Sample: la Groussinière S6, 17.60- 20.30 m (MNHN.F.F67622, F67623).

DIAGNOSIS. — Test fusiform, hyaline, oral end with ribs, aboral end rounded with opening.

TYPE AGE. — Early Pliocene.

TYPE LOCALITY. — La Pugle (Maine-et-Loire).

ETYMOLOGY. — From Latin bặsis (base) and rŏtundus (round).

MATERIAL EXAMINED. — Sample:la Pugle, 8.00 m ( MNHN.F.F67732), 16 specimens); sample:la Bouillonnaie, 12.50 m ( MNHN.F.F67733), 2 specimens.

SIZE. — Length: 0.570 mm; diameter = 0.165 mm

OCCURENCE. — Marls from la Pugle and la Bouillonnaie (Maineet-Loire); sandy marls from la Groussinière (Ille-et-Vilaine).

DESCRIPTION

Test fusiform, oral end covered with ribs, aboral end rounded; wall hyaline, smooth, finely perforate; aperture rounded; aboral end structure.

Figures

FIG. 5. — A-C, Deuteralagena sp. H, SGB3 (MNHN.F.F67620) in lateral, oral and basal views; D-P, Fususella basirotunda n. gen., n. sp.: D-G, la Pugle, holotype (MNHN.F.F67621); D, lateral view; E, oral end; F, G, oral and basal views; H-K, la Groussinière, paratype (MNHN.F.F67622): H, lateral view; I, pores; J, K, oral and basal views; L-P, la Groussinière, paratype (MNHN.F.F67623); L, lateral view; M, pores; N, O, oral and basal views; P, basal end. Scale bars: A, D, H, L, 200 µm; B, C, F, G, J, K, N, O, 100 µm; E, M, P, 20 µm; I, 5 µm.