Nummulites fichteli Michelotti, 1841

Gedik, Fatma & Karadenizli, Levent, 2021, Oligocene larger benthic foraminifera and sedimentation of the Burdur Basin, SW Anatolia, Turkey, Geodiversitas 43 (13), pp. 377-389 : 383

Nummulites fichteli Michelotti, 1841

( Fig. 4 A-J; 5C, J)

Nummulites fichteli Michelotti, 1841: 296 , figs 7a, b. — Cole 1960: pl. 3, figs 9-18. — Schaub 1981: pl. 50, figs 5-18. — Sirel 2003: pl. II, figs 12-19. — Gedik 2008: pl. 1, figs 1-14, 22.

Nummulites intermedius D’Archiac, Sirel & Gündüz, 1976 : pl. I, figs 5-9.

REMARKS

This reticulate species belongs to the N. fabianii lineage. This form has inflated lenticular shell with rounded periphery. The diameter of test ranges from 2 to 6.4 mm and the thickness from 0.5 to 1.8 mm. The test surface is covered with a reticulation that has rectangular or subrectangular mesh ( Fig. 4A , C-E; Fig. 5C ). The large microsphere (diameter 0.3 to 0.4 mm) is followed by the regular coiled whorls.

Figures

FIG. 4. — A-J, Nummulites fichteli Michelotti, 1841; A, equatorial section and external view, megalospheric form, İl-6B/3; B, equatorial section, megalospheric form, İl-6C/1; C, oblique equatorial section and external view, microspheric form, İl-7/B; D, oblique equatorial section and external view, microspheric form, İl- 7/A; E, external view, İl-6C/3; F-J, axial sections, İl-6B/2, İl-7/A, İl-6C/2, İl-6B/5. Scale bars: A, C, D, F, G, 1 mm; B, H-J, 0.5 mm; E, 2 mm.

FIG. 5. — A, B, Operculina complanata (Defrance, 1822); A, equatorial section, İl-6C/2; B, incomplete equatorial section, İl-6B/2; C, J, Nummulites fichteli Michelotti, 1841; C, external view, İl-6C/3; J, axial section, megalospheric form, İl-6A; D-G, Nephrolepidina praemarginata (Douvillé, 1908); D, axial section, İl-6A; E, external view, İl-6B/4; F, axial section, megalospheric form, İl-6C/1; G, axial section, İl-6B/2. H, I, Eulepidina sp., subaxial sections, İl-6A, İl-6B/5. Scale bars: A, 1 mm; B, D-G, L, 0.5 mm; C, I, J, 2 mm.