Distaltriangulisporites, Singh, 1971

Legrand, Julien, Pons, Denise, Nishida, Harufumi & Yamada, Toshihiro, 2011, Barremian palynofloras from the Ashikajima and Kimigahama formations (Choshi Group, Outer Zone of south-west Japan), Geodiversitas 33 (1), pp. 87-135 : 108

Distaltriangulisporites sp. ( Fig. 12B, C )

Distaltriangulisporites sp. B, Legrand, Palynologie des dépôts Jurassique supérieur et Crétacé inférieur du Japon, et provinces paléofloristiques du sud-est asiatique: 169, pl. XIV, fig. 10 (2009).

OCCURRENCE. — Ashikajima Fm.

DESCRIPTION

Cingulate trilete microspore.Amb rounded triangular. The laesurae are slightly raised and extend to the cingulum.Proximal face scabrate.The distal face shows flat muri forming a coarse reticulum with wide rounded lumina. Equatorial diameter = 28-32 µm.

BOTANICAL AFFINITIES

Schizaeales , Anemiaceae ( Dettmann & Clifford 1992) .

Figures

FIG. 12. — Spores and pollen grains from the Barremian of south-west Japan:A, Cingulatisporites sp.2, proximal face, Ashikajima Fm, SEM-II2c; B, C, Distaltriangulisporites sp., proximal and distal faces, Ashikajima Fm, II2c-N53; D, Contignisporites cooksonii (Balme, 1957) Dettmann, 1963, distal face, Kimigahama Fm, I1a-O51/1; E, Aequitriradites sp., Ashikajima Fm, II2c-Y59/2; F, Aequitriradites verrucosus (Cookson & Dettmann,1958) Cookson & Dettmann,1961,Ashikajima Fm,II2h-J66/4;G, M, Contignisporites burgeri Filatoff, McKellar & Price in Filatoff & Price, 1988, proximal and distal faces, Ashikajima Fm, II2d-P47/4; H, I, Polycingulatisporites reduncus