Sedis

• Main Authors: Legrand, Julien, Pons, Denise, Nishida, Harufumi, Yamada, Toshihiro
• Format: Text
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Sedis; Arctic; Canada; Denise
• Online Access: https://dx.doi.org/10.5281/zenodo.4610073; https://zenodo.org/record/4610073

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. : Published as part of 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), pp. 87-135 in Geodiversitas 33 (1) on page 116, DOI: 10.5252/g2011n1a6, http://zenodo.org/record/4597011 : {"references": ["MCGREGOR D. C. 1965. - Illustrations of Canadian fossils Triassic, Jurassic and Lower Cretaceous spores and pollen of Arctic Canada. Geological Survey of Canada papers 64 - 65: 1 - 32.", "KIMYAI A. 1966. - New plant microfossils from the Raritan Formation (Cretaceous) in New Jersey. Micropaleontology 12 (4): 461 - 476."]}