Fig. 2. Microspheric B in Three shell types in Mardinella daviesi indicate the evolution of a paratrimorphic life cycle among late Paleocene soritid benthic foraminifera

Fig. 2. Microspheric B forms (agamonts) of soritid foraminifer Mardinella daviesi (Henson, 1950) from the Thanetian, Paleocene of Iran. A. Gmm13980F40a, subaxial oblique section; note the brood chambers in the adult reproductive stage of growth (arrows). B. Gmm13980F40b, axial section showing empty brood chambers (two-headed arrow) on both sides of the specimen. C. Gmm13980F40c, subequatorial section. D. Gmm13980F40d, oblique section with some brood chambers (two-headed arrow). E. Gmm13980F41a, fragment of shell with five brood chambers; note the irregularly disposed beams. Scale bar 1 mm.