Lagena variokoreana, 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 : 26

Lagena variokoreana n. sp.

( Figs 18 H-P; 32F, G)

urn:lsid:zoobank.org:act:9FA61849-D259-4B25-A841-6633303EFFF5

Lagena sp. F – Margerel 2009: 584 , fig. 5S-U.

HOLOTYPE. — Sample: LRK2, 2.20 m (MNHN.F.F67680).

PARATYPE. — Sample: LRK2, 2.20 m (MNHN.F.F67681).

DIAGNOSIS. — Test ovoid ornamented with longitudinal costae, distinct neck ornamented with ridges connecting the costae, aperture rounded, aboral opening.

TYPE AGE. — Late Pliocene.

TYPE LOCALITY. — Brest-LRK2 (Finistère).

ETYMOLOGY. — From Latin vˇarĭē (variety) and koreana ( Lagena cf. koreana McCulloch, 1977 ).

OTHER MATERIAL EXAMINED. — Sample: LRK2, 2.20 m ( MNHN.F.F67682, F67683); sample: LRK2, 2.20 m ( MNHN.F.F67757), 27 specimens.

SIZE. — Length = 0.260 mm; diameter = 0.160 mm.

DESCRIPTION

Test ovoid ornamented with longitudinal costae alternating with shorter (30) extend onto the neck; distinct neck surrounding by plates delimiting chamberlets externally closed with trapezoidal walls; wall punctate; aperture rounded; aboral end structure.

REMARK

This species is near of Lagena cf. koreana ( McCulloch, 1977: 92, pl. 35, fig. 1). It is differing by a number most large of costae.

Figures

FIG. 18. — A-D, Lagena sulcata (Walker & Jacob,1798),SGB3 (MNHN.F.F67678):A, lateral view;B, perforated wall;C, D, oral and basal views;E-G, Lagena torquiformis Haynes, 1973, SGB3 (MNHN.F.F67679) in lateral, oral and basal views; H-P, Lagena variokoreana n. sp., Brest-LRK2: H-K, holotype (MNHN.F.F67680): H, lateral view; I, perforated wall; J, K, oral and basal views; L, specimen with broken neck; M-O, paratype (MNHN.F.F67681), lateral, oral and basal views; P, internal view. Scale bars: A, E, H, L, M, 200 µm; B, 20 µm; C, D, F, G, J, K, N-P, 100 µm; I, 5 µm.