Fig. 6 Broeckinella arabica Henson, upper Maastrichtian Tarbur Formation of the Mandegan (a, d) and Naghan sections (b– c, e–f), Zagros Zone, SW Iran. a, c–d Oblique equatorial sections, partly fragmentary, in some parts crossing the subepidermal network (e.g., a and left side of d). Note the undivided central part of the chambers in c. b Tangential section in the plane with only main partitions aligned between subsequent chambers (= zone 2 in Henson 1948; see Fig. 6a). e–f Oblique sections. Note initial planispiral part in the megalospheric specimen in e passing the proloculus (arrow). Note also the chambers undivided in the central part in e. Thin-sections: Rt 104 (a), NG 42-1 (b), NG 21 (c), Rt 85 (d), 2NG 49 (e), 2NG 112 (f). Scale bars 0.5 mm.