Cingutriletes sp., 1963

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

Cingutriletes sp. ( Fig. 10Q )

OCCURRENCE. — Ashikajima Fm.

DESCRIPTION

Cingulate trilete microspore.Amb rounded triangular with straight to convex sides.The laesurae are straight and extend to the ⅔ of the spore radius (a little before the cingulum). The cingulum is wide (4-5 µm, that is to say more than 1/5 of the spore radius). Exine psilate. Equatorial diameter = 30-35 µm.

BOTANICAL AFFINITIES

Filicopsida ( Couper 1958), Lycopsida ( Selaginellaceae ?) ( Pierce 1961).

Figures

FIG. 10.— Spores from the Barremian of south-west Japan:A-F, Nodosisporites makotoi n. sp.(A, D, proximal and distal faces,Ashikajima Fm, II2a-L58/2; B, E, proximal and distal faces, Ashikajima Fm, II2b-E56/3; C, F, proximal and distal faces, Ashikajima Fm, II2b-U33); G-K, Nodosisporites choshiensis n.sp.(G, H, lateral view,Ashikajima Fm,II2b-K22/2;I, lateral view,Ashikajima Fm,II2b-E40b;J, proximal face, Kimigahama Fm, SEM-I1a; K, distal face, Kimigahama Fm, SEM-I1b); L-N, Cingulatisporites sp. 1 (L, proximal face, Kimigahama Fm,I1b-R41;M, N, proximal and distal faces, Ashikajima Fm,II2c-J26/3);O, P, Cingulatisporites psilatus Groot & Penny,1960,proximal and distal faces, Kimigahama Fm, I1a-W67g; Q, Cingutriletes sp., proximal face, Ashikajima Fm, II2a-H67g. Scale bar: 10 μm.