Geinitzina indepressa Cherdyntsev, 1914

Vachard, D, Krainer, K & Lucas, SG, 2015, Late Early Permian (late Leonardian; Kungurian) algae, microproblematica, and smaller foraminifers from the Yeso Group and San Andres Formation (New Mexico; USA), Palaeontologia Electronica (English ed.) 3 (8), pp. 1-77 : 62

Geinitzina indepressa Cherdyntsev, 1914

Figure 25.8-25.9, 25.12-25.14

1914 Geinitzina indepressa Cherdyntsev , p. 26-27, pl. 1, fig. 9.

2000 Geinitzina indepressa Cherdyntsev ; Groves, p. 300-301, pl. 5, figs. 1, 2, 3, 4, 5, 6 (with synonymy).

v. 2013 b Geinitzina ex gr. postcarbonica Spandel - Vachard, Krainer and Lucas, p. 348 (no illustration).

Description. Test straight triangular, moderately elongate. Chambers semisinushaped. H = (0.14)- 0.16-0.45 mm; w = (0.07)- 0.10-0.22 mm; h = (0.02)- 0.03-0.06 mm; s = 0.01 mm. Proloculus spherical, a little prominent, 0.02-0.03 mm in diameter. Up to nine chambers, relatively short and high for the genus; moreover, the central depression is absent or very faint. Aperture terminal, central, simple, a little depressed.

Remarks. This species differs from G. postcarbonica in the shape of the chambers with a convex roof and not a centrally depressed one, and from G. spandeli plana Lipina, 1949 , which is relatively similar, by more chambers and a smaller proloculus.

The material of Groves (2000) is remarkably similar to ours and proves the importance of this species for the stratigraphic and geographic correlations in North America.

Occurrence. Early Permian (sensu lato) of Russian Platform, Urals, and Xizang ( China). Artinskian (early Leonardian) of Oklahoma ( USA). Late? Kungurian (late Leonardian) of New Mexico (San Andres Fm: samples SAR 8a-7, SAR 8a-11, SAR 8a-14, SAR(2) 11-2, SAR 11-13, SAR 11a-10, SAR(2) 13-7, SAR(2) 13-10, SAR 18-1, SAR(2) 19- 11).

Figures

FIGURE 25. 1-2. Globivalvulina novamexicana n. sp. 1. NMMNH P-67561, holotype. Subaxial section. San Andres Fm. Sample MLY 6-17. 2. NMMNH P-67563, paratype. Subaxial section. San Andres Fm. Sample MLY 6-29a. 3. Globivalvulina parapiciformis n. sp. NMMNH P-67552, two paratypes. Two oblique sections. San Andres Fm. Sample MLY 6-11a. 4. Nestellorella? sp. Subaxial section. San Andres Fm. Sample MLY 1-1. 5. Protonodosaria? sp. Subaxial section. San Andres Fm. Sample MLY 3-5. 6-7, 10, 17-19. Nodosinelloides longa (Lipina, 1949). 6. Axial section. San Andres Fm. Sample SAR 8a-4a. 7. Subaxial section. San Andres Fm. Sample SAR 8a-8. 10. Axial section. San Andres Fm. Sample SAR 8a-17 (already illustrated by Brose et al., 2013, figure 6.5). 17. Axial section. San Andres Fm. Sample SAR 11a-6. 18. Axial section. San Andres Fm. Sample SAR 11a-9. 19. Axial section. San Andres Fm. Sample SAR 12-4. 8-9, 12-14. Geinitzina indepressa Cherdyntsev, 1914. 8. Axial section. San Andres Fm. Sample SAR 8a-11. 9. Axial section. San Andres Fm. Sample SAR 8a-14. 12. Subaxial section. San Andres Fm. Sample SAR 8a-7. 13. Subaxial section. San Andres Fm. Sample SAR 11-13. 14. Oblique subaxial section. San Andres Fm. Sample SAR 11a-10. 11, 15, 20?, 21. Nodosinelloides netjaschewi (Cherdyntsev, 1914). 11. Axial section. San Andres Fm. Sample SAR 11-17. 15. Axial section. San Andres Fm. Sample SAR 11-19/19a. 20. Axial section. San Andres Fm. Sample SAR 20.2. 21. Axial section. San Andres Fm. Sample SAR 13a-2. 16. Nodosariata indet. cf. Dentalina cf. ninae Grozdilova sensu Chuvashov et al., 1990. Axial section. San Andres Fm. Sample SAR 11a-4. Scale bars equal 0.10 mm.