Verulagena laevis ( Montagu, 1803 ) 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 : 44

Verulagena laevis ( Montagu, 1803) , n. comb. ( Figs 27 B-K; 33O, P; 34A)

Vermiculum laeve Montagu, 1803: 3 , pl. 1, fig. 9.

Lagena vulgaris – Williamson 1848: pl. 4, figs 5, 5a.

Lagena laevis – Buchner 1940: 418, pl. 3, fig. 36 (non figs 34, 35).

LOCALITIES. — St Erth (Cornwall), la Groussinière (Ille-et-Vilaine).

MATERIAL EXAMINED. — Sample: St. Erth no. 66/15 ( MNHN.F.F67719, F67720); sample: la Groussinière S12, 14.50-16.80 m ( MNHN.F.F67721); sample: St Erth no. 66/10 ( MNHN.F.F67769), 3 specimens.

AGE. — Basal Late Pliocene.

DESCRIPTION

Test ovoid tapering to oral end ornamented with vertical ridges; wall smooth, hyaline, finely perforate; aperture rounded; aboral end structure.

Verulagena maximaperforata n. gen., n. sp. ( Figs 27 L-P; 28A-F; 34B, C)

urn:lsid:zoobank.org:act:3673219A-4C91-46C4-8232-0A6DB71F6397

HOLOTYPE. — Sample: l’Épinay, 6.50 m (MNHN.F.F67722).

PARATYPES. —Two paratypes:Sample:la Groussinière S6, 16.40- 15.90 m (MNHN.F.F67723); sample: SSL S3, 2.30 m (MNHN.F.F67724).

DIAGNOSIS. — Test fusiform, base ornamented with costae, perforate, aboral opening.

TYPE AGE. — Early Pliocene to Late Pliocene.

TYPE LOCALITY. — L’Épinay (Maine-et-Loire).

ETYMOLOGY. — From Latin maxĭmē (very) and perfŏrāre (perforate).

OTHER MATERIAL EXAMINED. — Sample: la Bouillonnaie ( MNHN.F.F67770), 6 specimens; sample: l’Épinay ( MNHN.F.F67771), 8 specimens.

SIZE. — Length = 0.275 mm; diameter = 0.317 mm.

OCCURENCE. — Marls from l’Épinay and la Bouillonnaie (Maineet-Loire), sandy clay from la Groussinière (Ille-et-Vilaine) and falun from Saint-Sulpice-des-Landes (Loire-Atlantique).

DESCRIPTION

Test ovoid, base ornamented with costae (11) tapering to oral end ornamented with ridges, flat ring at aboral end; wall hyaline, densely perforate; aperture rounded; aboral end structure.

Figures

FIG. 27. — A, Verulagena similis (McCulloch, 1977), n. comb., La Bouillonnaie (MNHN.F.F67718), basal view; B-K, Verulagena laevis (Montagu, 1803), n. comb.: B-D, St.Erth (MNHN.F.F67719),lateral, oral and basal views;E-H, St.Erth (MNHN.F.F67720);E, lateral view;F, perforated wall; G, H, oral and basal views;I-K, la Groussinière (MNHN.F.F67721) in lateral, oral and basal views; L-P, Verulagena maximaperforata n. gen., n. sp., l’Épinay, holotype (MNHN.F.F67722): L-N, lateral, oral and basal views; O, P, lateral and perforated wall. Scale bars: A, B, E, I, M, N, 100 µm; C, D, H, J, K, 50 µm; F, 10 µm; G, 5 µm; L, O, 200 µm; P, 20 µm.