Tasmanites sp.

OCCURRENCE. — Ashikajima Fm (rare).

DISTRIBUTION. — This genus is known from the Precambrian to possibly Holocene.

DESCRIPTION

Cyst with a circular equatorial shape. The wall is thick (about 10 µm), pierced by many distinct small pores about 1 µm in diameter. A slit can be seen at the center of the cyst, suggesting an empty phycoma. Equatorial diameter = 83-93 µm.

BOTANICAL AFFINITIES

Pterospermatales, Tasmanitaceae of marine environment.