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Horologinella tenuissima
Horologinella tenuissima He Chengquan, 1991
Holotype: He Chengquan, 1991, pl.5, fig.10; text-fig.6; Pestchevitskaya, 2001, pl.2, fig.12; Pestchevitskaya, 2003, pl.2, fig.17.
Age: Paleocene
Description in He Chengquan, 1991, translated by Suning Hou 7-1-2019
Description: The cyst is small, dumbbell-shaped or horologinella shape, with roughly equal but opposite direction two concave edge, concave shallow and parabolic, the other 2 edges are more or less convex. 4 corners are roughly round, each corner with a weak hairy thorn, about 2. 5μm, and sometimes corner thorns may fold up. Wall thin, smooth surface. On a convex edge, it may show the double outline, which may be related to the apical archeopyle.
Cyst length 13 to 18.5μm, width (not including thorns) 12. 5-16 μm (measured 2 tablets); holotype length 18. 5μm, width (excluding thorns) 16μm, thorn length about 2.5μm.
Comparison: The new species differs from Horologinella incurvata, H.? spinosa in possessing four corners are more round, concave side shallow, with a hairy thorn in each corner.
Holotype: He Chengquan, 1991, pl.5, fig.10; text-fig.6; Pestchevitskaya, 2001, pl.2, fig.12; Pestchevitskaya, 2003, pl.2, fig.17.
Age: Paleocene
Description in He Chengquan, 1991, translated by Suning Hou 7-1-2019
Description: The cyst is small, dumbbell-shaped or horologinella shape, with roughly equal but opposite direction two concave edge, concave shallow and parabolic, the other 2 edges are more or less convex. 4 corners are roughly round, each corner with a weak hairy thorn, about 2. 5μm, and sometimes corner thorns may fold up. Wall thin, smooth surface. On a convex edge, it may show the double outline, which may be related to the apical archeopyle.
Cyst length 13 to 18.5μm, width (not including thorns) 12. 5-16 μm (measured 2 tablets); holotype length 18. 5μm, width (excluding thorns) 16μm, thorn length about 2.5μm.
Comparison: The new species differs from Horologinella incurvata, H.? spinosa in possessing four corners are more round, concave side shallow, with a hairy thorn in each corner.