Glycydendron, Ducke, 1922

Ramírez-Arriaga, Elia, Prámparo, Mercedes B. & Martínez-Hernández, Enrique, 2014, Angiosperm pollen grains from the Cuayuca Formation (Late Eocene to Early Oligocene), Puebla, Mexico, Palaeontologia Electronica 102 (8), pp. 1-38 : 19

Glycydendron pollen type

Figures 3.14-15

Material. Sample Pb-9137, Palynology Laboratory, IGLUNAM.

Description. Monad pollen, isopolar, radiosymmetric, amb circular. Tricolpate, colpi with irregular margin. Exine intectate, 1.2–1.5 µm thick, echinate, spines 1.2–2 µm high are very thick at their bases in contrast with the thin flexible apices.

Dimensions. Equatorial diameter 31 µm, one specimen measured.

Comparisons. Glycydendron pollen type is intectate, echinate, and similar to the specimen described from the Miocene Uscari Formation ( Graham, 1987), but it is of smaller dimensions. In contrast, the Glycydendron pollen type from the Cuayuca Formation has echinae with flexible apices which are thinner than those described by Graham (1987) from the Miocene of Costa Rica.

Other occurrences. Central America – Miocene Uscari Formation, Costa Rica ( Graham, 1987). There are no previous records of the genus in Mexico.