Cerebropollenites thiergartii EBERH. SCHULZ , 1967

Hofmann, Christa-Ch., Odgerel, Nyamsambuu & Seyfullah, Leyla J., 2021, The Occurrence Of Pollen Of Sciadopityaceae Luerss. Through Time, Fossil Imprint 77 (2), pp. 271-281 : 274

Cerebropollenites thiergartii EBERH. SCHULZ, 1967

Text-fig. 2d–f

O c c u r r e n c e. Locality 2, Khovil opencast mine,

Mongolia.

D e s c r i p t i o n. Monad of subspheroidal shape, circular to elliptical pollen grain in polar view, and elliptical in equatorial view; equatorial axes 42.4–48.7 µm (LM) and 33.1 to 37.4 µm (SEM), polar axis ca. 24.4 µm (SEM, N = 3); wall thickness ca. 2.2 to 2.8 µm, probably thinning towards the leptoma (thinning well visible on LM image); sculpturing verrucate to occasionally rugulate, perforate, with evenly distributed supratectal echini; leptoma partly covered with echinate micro verrucae.

R e m a r k s.Intwo C. thiergartii specimens the verrucae are considerably smaller than in C. macroverrucosus (see below), and very well comparable to the ones in Sciadopityspollenites serratus and extant Sciadopitys verticillata .

Figures

Text-fig. 2. Aptian to Albian Cerebropollenites taxa, all scale bars in LM and SEM overview images 10 µm, scale bars in SEM detailed images 2 µm. a–c: Cerebropollenites thiergartii from St. Pölten (Austria), a – LMimage, equatorial view, b – SEM equatorial overview with visible, less sculptured leptoma, c – detail of echinate verrucae; d–f: Cerebropollenites thiergartii from Khovil basin (Mongolia), d – LM image polar view with well visible thin-walled leptoma, e – SEM of proximal polar view with faintly sculptures leptoma, f – SEM detailed view of transition from leptoma to normal sexine sculpturing; g–i: Cerebropollenites macroverrucosus from Khovil basin (Mongolia), g – LM image of oblique equatorial view, h – SEM of oblique equatorial view with concave leptoma, i – SEM detail of the rugulate to verrucate sexine and smaller sculpturing in leptoma area.