Fig. 7 Dictyoconus bakhtiari n in Orbitolinid Foraminifera From The Late Maastrichtian Of The Tarbur Formation (Zagros Zone, Sw Iran)

Fig. 7 Dictyoconus bakhtiari n. sp. from the late Maastrichtian of the Tarbur Formation, Naghan section, SW Iran. a, e Axial section of megalospheric specimen. Detail of biconch in e. b Tangential section passing through the initial spire with embryo. c Tangential section passing (from above to below) the initial spire with embryo, the marginal zone with large quadrangular pattern of primary septules (beams) (1, in yellow), and the complex pattern of intercalary beams and rafters (2, orange). d Fragmentary tangential section. Note the rounded transverse sections of the chamberlets produced by the primary septules (beams) in the lower middle part of the test. f–g, j, Subaxial sections. Detail of the marginal zone (from g) showing rafters in j. h Oblique section. i, k Subaxial sections. Abbreviations: b = beam, deu = deuteroconch, mf = marginal foramen, p = protoconch, pi = pillar, r = rafter, s = septum. 1: dense subepidermal network of higher order beams (intercalary beams) and rafters. 2: coarse rectangular subepidermal network of primary rafters and beams. Thin-sections: 2NG32 (a, e), Ng 112 (b-c), Ng 15 (d), 2NG52 (f), 2NG53 (g, j, k), Ng 73 (h), Ng 83-3 (i).