Neoraistrickia sp. 3, 1956

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 : 96

Neoraistrickia sp. 3 ( Fig. 7G, J )

Neoraistrickia sp . C, Legrand, Palynologie des dépôts Jurassique supérieur et Crétacé inférieur du Japon, et provinces paléofloristiques du sud-est asiatique: 144, pl. IV, figs 11, 15 (2009).

OCCURRENCE. — Ashikajima and Kimigahama Fm.

DESCRIPTION Triletemicrospore.Ambcircular.Thelaesuraecannotbe clearly seen; they seem short and raised in a very small contact area.The two faces are densely covered by more or less short and sinuous rugulae topped by bacula, coni, spines or tubercules ( 4 to 7 µm high), giving to the spore a bristling appearance. The exine is about 3 µm thick. Equatorial diameter = 35-45 µm.

REMARK

The ornamentation of Neoraistrickia sp. 3 has similarities with that of N. sp. 2, but can be distinguished from the later by its dense and bristling appearance and its thicker exine.

BOTANICAL AFFINITIES

Bryophyta or Lycopsida ( Selaginellaceae )?

Figures

FIG. 7. — Spores from the Barremian of south-west Japan: A, B, Neoraistrickia sp. 1, proximal and distal faces, Ashikajima Fm, II2c- U62/3d;C, D, Neoraistrickia sp.2,proximal and distal faces,Ashikajima Fm,II2c-H33/4;E, F, I, L, M, Klukisporites variegatus Couper,1958 (E, proximal face, Kimigahama Fm, SEM-I1a; F, distal face, Kimigahama Fm, SEM-I1a; I, L, proximal and distal faces, Kimigahama Fm, I1a-H48/1a; M, proximal face,Ashikajima Fm,SEM-II2c);G, J, Neoraistrickia sp. 3, proximal and distal faces,Kimigahama Fm,I1b-S68g; H, K, N-P, Lycopodiumsporites dentimuratus Brenner,1963 (H, proximal face,Kimigahama Fm,SEM-I1c; K, N, proximal and distal faces, Ashikajima Fm, II2f-M56/2; O, lateral view, Kimigahama Fm, SEM-I1a; P, lateral view,Ashikajima Fm, II2e-R56/2). Scale bar: 10 μm.