Lanternalagena crassicarinata, 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 : 36

Lanternalagena crassicarinata n. gen., n. sp. ( Figs 23 A-H; 33E, F)

urn:lsid:zoobank.org:act:D3D68553-C0FE-40B9-93DB-EA2C9293B2C3

HOLOTYPE. — Sample: la Groussinière S6, 16.40-16.90 m (MNHN.F.F67703).

PARATYPE. — Sample: la Sautré, 15.00 m (MNHN.F.F67704).

DIAGNOSIS. — Test ovoid ornamented with large costae, conical reticulate neck, aboral opening.

TYPE AGE. — Early to basal Late Pliocene.

TYPE LOCALITY. — La Groussinière (Ille-et-Vilaine).

ETYMOLOGY. — From Latin crassus cărĪna (hull shape).

OTHER MATERIAL EXAMINED. — Sample: la Groussinière S6, 16.40- 16.90 m ( MNHN.F.F67764), 4 specimens.

SIZE. — Length = 0.541 mm; diameter = 0.263 mm.

OCCURENCE. — Sandy marls from la Groussinière (Ille-et-Vilaine) and marls from la Sautré (Maine-et-Loire).

DESCRIPTION

Test ovoid ornamented with longitudinal large costae (9); neck conical surrounded with chamberlets closed with punctate walls and polygonal ornamentation; wall hyaline, perforate particularly adjacent to the costae; aperture rounded with striated rim; aboral end structure.

Figures

FIG. 23. — A-H, Lanternalagena crassicarinata n. gen., n. sp.; A-D, la Groussinière, holotype (MNHN.F.F67703); A, lateral view; B, perforated wall; C, D, oral and basal views; E-H, la Sautré, paratype (MNHN.F.F67704): E, lateral view; F, perforated wall; G, H, oral and basal views; I-P, Lanternalagena novocrassicarinata n. gen., n. sp.: I-L, la Sautré, holotype (MNHN.F.F67705);I, lateral view; J, perforated wall; K, L, oral and basal views; M-P, Fécamp, paratype (MNHN.F.F67706); M, lateral view; N, perforated wall; O, P, oral and basal views. Scale bars: A, E, I, M, 200 µm; B, F, 20 µm; C, D, G, H, K, L, O, P, 100 µm; J, N, 50 µm.