Patellasporites constrictus, Singh, 1964

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 : 114

Pityosporites sp. cf. P. constrictus Singh, 1964 ( Fig. 13A )

OCCURRENCE. — Ashikajima and Kimigahama Fm.

DESCRIPTION

Bisaccate pollen grain. Central body more or less spherical, granulate. The sacci are reticulate; they are small, hanging, narrower at their base, letting a space of about 12 µm between them. The exine is thin (about 1 µm). Total width = 50 µm. Central body diameter = 30 µm. Sacci (length × width) = 25 × 17- 20 µm.

REMARKS

This grain is morphologically very similar to Pityosporites constrictus Singh, 1964 previously reported from the Aptian-Albian of Korea ( Yi et al. 1993), Albian of Canada ( Singh 1964), and Santonian of the Kuji Group in north-east Honshu, Japan ( Miki 1972; Takahashi & Sugiyama 1990).

BOTANICAL AFFINITIES

Pinales .

Figures

FIG. 13. — Pollen grains, alga and fungus from the Barremian of south-west Japan: A, Pityosporites sp. cf. P. constrictus Singh, 1964, lateral view, Ashikajima Fm, II2b-J34/1; B, Alisporites thomasii (Couper, 1958) Pocock, 1962, polar view, Ashikajima Fm, II2b-O42/3; C, Incertae sedis sp. 2, Ashikajima Fm, II2c-W65/4; D, Balmeiopsis limbatus (Balme, 1957) Archangelsky, 1977, Ashikajima Fm, II2d- N41/2; E, Inaperturopollenites sp., Kimigahama Fm, I1b-U64/4; F-H, Classopollis torosus (Reissinger, 1950) Couper, 1958 emend. Burger, 1965 (F, distal polar view, Ashikajima Fm, SEM-II2a; G, distal polar view, Ashikajima Fm, II2c-H32/1; H, tetrad, Ashikajima Fm, SEM-II2a); I, Cycadopites minimus (Cookson, 1947) Pocock, 1970, Ashikajima Fm, II2e-U64; J, Cycadopites sp., Kimigahama Fm, I1a-X30; K, Ephedripites montanaensis Brenner, 1968, Ashikajima Fm, II2c-N35/4h; L, Gnetaceaepollenites sp., Ashikajima Fm, II2a-S47/1a; M, Corollina sp.,tetrad,Kimigahama Fm, I1a-X42; N, O, Incertae sedis sp. 1, group with detail,Ashikajima Fm,SEM-II2a; P, Pterospermella sp., Ashikajima Fm, II2b-O65; Q, Microthyriacites sp., Ashikajima Fm, II2e-R63/4. Scale bars: 10 μm.