Laevilagena pyriformis, 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 : 16-18

Laevilagena pyriformis n. gen., n. sp. ( Figs 10 J-P; 11A-D; 31B, C)

urn:lsid:zoobank.org:act:5EF65F20-69EE-4882-9DE9-61218DCE0B89

HOLOTYPE. — Sample: Mernel S212, 5.50 m (MNHN.F.F67643).

PARATYPES. — Two paratypes: Sample: Mernel S214, 8.50 m (MNHN.F.F67644); Sample: la Groussinière S6, 13.60-14.50 m (MNHN.F.F67645).

DIAGNOSIS. — Test pear-shaped in outline; partly ornamented with acute costae; wall hyaline, perforate; aboral opening.

TYPE AGE. — Late Pliocene.

TYPE LOCALITY. — Mernel (Ille-et-Vilaine).

ETYMOLOGY. — From Latin pirum (pear) and forma (form). MATERIAL EXAMINED. — Sample: Mernel S212, 5.50 m (MNHN.F.F67742), 6 specimens.

SIZE. — Length = 0.663 mm; diameter = 0.188 mm.

OCCURENCE. — Falun from Mernel and sandy clay from la Groussinière (Ille-et-Vilaine).

DESCRIPTION

Test, pear shape in outline, elongated, partly ornamented with longitudinal acute costae(12), base weakly rounded; wall hyaline, perforate; aperture rounded with striated lip; aboral end structure.

Figures

FIG. 10. — A, Hyalinonetrionella sp., Brest-LRK2 (MNHN.F.F67640);B-I, Laevilagena guttaformis n. gen., n. sp.: B-E, holotype, la Groussinière (MNHN.F.F67641); B, lateral view;C, pores; D, E, oral and basal views; F-I, paratype, Mernel (MNHN.F.F67642): F, lateral view; G, pores; H, I, oral and basal views; J-P, Laevilagena pyriformis n. gen., n. sp., Mernel: J-M, holotype (MNHN.F.F67643): J, lateral view; K, pores; L, M, oral and basal views; N-P, paratype: N, lateral view; O, pores; P, oral view. Scale bars: A, C, 50 µm; B, F, J, N, 200 µm; D, E, H, I, L, M, P, 100 µm; G, K, O, 20 µm.