Fig. 11 in Orbitolinid Foraminifera From The Late Maastrichtian Of The Tarbur Formation (Zagros Zone, Sw Iran)

Fig. 11 Pseudorbitolina cf. marthae Douvillé from the late Maastrichtian of the Tarbur Formation, Naghan section, SW Iran. a–b Axial section. Detail of protoconch in b. c Subaxial section of a low convexo-concave specimen. d Subaxial section of a high convexo-concave specimen. e, j Tangential sections showing the vertically aligned arrangement of main septules (beams). f–g Oblique sections. Note the undivided chamber zone sensu Neumann (1978). h Subaxial section of a juvenile specimen. i Detail of a specimen in axial section showing the "undivided zone" sensu Neumann (1978) connected by radial foramina (= tubular aperture sensu Henson, 1948). Abbreviation: tu = tubular aperture, uz = undivided zone. Thin-sections: 2NG 47 (a–c, f), 2NG 43 (d), Ng 47-1 (e, g), Ng 65-1 (h), 2NG 47 (i), 2NG 116 (j).