Rhoipites aff. cryptoporus Srivastava, 1972

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 : 13

Rhoipites aff. cryptoporus Srivastava, 1972

Figure 3.21-22

Material. Sample Pb-8890, Palynology Laboratory, IGLUNAM.

Description. Monad pollen, isopolar, radiosymmetric, prolate. Tricolporate, endoaperture circular 2 µm in diameter. Exine tectate, columellate, 1 µm thick, micropitted.

Dimensions. Equatorial diameter 15 µm, polar diameter 22 µm, one specimen measured.

Comparisons. This pollen grain resembles a specimen illustrated by Jardine and Harrington (2008) from the Paleocene of Mississippi, U.S.A. It is characterized by its circular endoaperture and its subtectate–reticulate exine; but the specimen from Mississippi is larger ( Jardine and Harrington, 2008: 29 µm polar diameter). Differs from R. cryptoporus , which is heterobrochate ( Srivastava, 1972).

Other occurrences. Rhoipites has shown worldwide distribution since the late Cretaceous ( Srivastava, 1972). R. cryptoporus has been recovered from the late Paleocene of Mississippi, U.S.A. ( Jardine and Harrington, 2008) and Alabama ( Srivastava, 1972). There are no previous records of this taxon in Mexico.