Contignisporites ugensis, Takahashi & Sugiyama, 1990

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 : 112

Callialasporites sp. cf. C. ugensis Takahashi & Sugiyama, 1990 ( Fig. 12N )

OCCURRENCE. — Ashikajima Fm (rare).

DESCRIPTION

Monosaccate pollen grain. Amb oval to subcircular. The central body is surrounded by a narrow and undulating equatorial saccus (5-8 µm). The exine is punctate on the thinned distal pole area. Equatorial diameter = 35-55 µm.

REMARKS

Two morphologically similar but larger species have been reported by Takahashi & Sugiyama (1990) from the Santonian of the Taneichi Formation, north-east Honshu, Japan (70-84 µm): Callialasporites ugensis Takahashi & Sugiyama , and by Kumar (1973) from the Lower Cretaceous of India (55-68 µm): Callialasporites doringii Kumar (previously named C. lenticularis (Döring, 1961) Venkatachala & Kar, 1969 by Singh & Kumar (1969): pl. 1, figs 15, 16). Deák (1962) reported a grain also showing similarities to ours: Inaperturopollenites undulatus Weyland & Greifeld, 1953 (pl. 12, figs 10, 13).

BOTANICAL AFFINITIES

Pinales . Archangelsky & Gamerro (1967) and Gamerro (1965, 1968)suggested similarities of grains of the genus Callialasporites with those observed in cones of Apterocladus lanceolatus Archangelsky (Podocarpaceae) from the Lower Cretaceous of Patagonia. Van Konijnenburg - Van Cittert (1971) reported abnormal grains of the same morphology in an Araucariaceae .

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 (Bolkhovitina, 1953) Playford & Dettmann, 1965, proximal and distal faces, Kimigahama Fm, I1a-Z52; J, Laevigatosporites sp., lateral view,Ashikajima Fm,II2e-Y60; K, Laevigatosporites ovatus Wilson & Webster,1946,lateral view,Kimigahama Fm,I1c-P35/3;L, Exesipollenites tumulus Balme, 1957, distal view, Kimigahama Fm, I1a-R60/3; N, Callialasporites sp. cf C. ugensis Takahashi & Sugiyama, 1990,Ashikajima Fm, II2f-Y42/3;O, Eucommiidites troedssonii (Erdtman,1948) Potonié, 1958,Kimigahama Fm, I1b-R39; P, Cerebropollenites mesozoicus (Couper,1958) Nilsson,1958, lateral view,Ashikajima Fm,II2a-J61/1d; Q, Alisporites sp., polar view, Ashikajima Fm, II2d-Q59/2; R, Callialasporites dampieri (Balme, 1957) Sukh-Dev, 1961, Ashikajima Fm, II2b-T46/4m. Scale bar: 10 μm.