Barremian palynofloras from the Ashikajima and Kimigahama formations (Choshi Group, Outer Zone of south-west Japan) Author Legrand, Julien Author Pons, Denise Author Nishida, Harufumi Author Yamada, Toshihiro text Geodiversitas 2011 2011-03-31 33 1 87 135 http://dx.doi.org/10.5252/g2011n1a6 journal article 7707 10.5252/g2011n1a6 31ed99a5-9135-40a2-92a4-64217d9de577 1638-9395 4597011 Incertae sedis sp. 2 ( Fig. 13C ) Incertae sedis sp. G, Legrand, Palynologie des dépôts Jurassique supérieur et Crétacé inférieur du Japon , et provinces paléofloristiques du sud-est asiatique : 195, pl. XXI, fig. 7 (2009). OCCURRENCE. — Ashikajima Fm. DESCRIPTION Pollen grain. Amb oval in polar view. An eight shape wide median sulcus with rounded ends, runs through the grain. In the middle part of the grain, the edges of the sulcus strongly widen (until 10-12 µm ), and can fold one over the other. This thickening can widen progressively or quite abruptly. The exine is psilate (about 1.5 µm thick). Length × width = 40-50 × 30- 35 µm ; longitudinal thickenings (length × width) = 25 × 10-12 µm . REMARKS These grains have similarities with Cycadopites , but the folded lips that can be observed here on some grains are much more developped. The genus Entylissa Naumova ex Ischenko, shows developped lips, but slenderer and more ornamented than in Incertae sedis sp. 2. McGregor (1965) figured a pollen grain similar to our species: cf. Ginkgocycadophytus caperatus (Luber, 1941) Samoilovich, 1953 (pl. 5, fig. 25), from the Upper Jurassic of Canada . Monosulcites scaber Kimyai, 1966 reported from the Cretaceous of New Jersey , USA ( Kimyai 1966 ), also shows great similarities to our species. BOTANICAL AFFINITIES Gymnosperms.