Intratriporopollenites sp.

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 : 11

Intratriporopollenites sp.

Figure 3.17

Material. Sample Pb-9340, Palynology Laboratory, IGLUNAM.

Description. Monad pollen, isopolar, radiosymmetric, amb circular. Triporate, planaperturate, pores annulate, annulus 1 µm thick. Exine semitectate, columellate, 0.5 µm thick, microreticulate, homobrochate.

Dimensions. Equatorial diameter 20 µm, one specimen measured.

Comparisons. Elsik and Dilcher (1974, plate 29, figures 91–92) reported a similar specimen as Bombacaceae , Sterculiaceae , Tiliaceae ? from middle Eocene Claiborne Formation, Tennessee. Other similar Intratriporopollenites ( Frederiksen, 1980a, plate 14, figure 17) and Tiliaepollenites ( Tschudy and van Loenen, 1970, plate 5, figures 11a, 11b) were reported from upper Eocene, Jackson Group. Tilia was recovered from middle Eocene Kisinger Lake locality ( Leopold, 1974: plate 44, figure 18) and Intratriporopollenites ceciliensis from the Eocene of California ( Frederiksen, 1989, table 5, figures 2, 3). Intratriporopollenites differs from Bombacacidites because the later taxa is suprareticulate with the greatest diameter of the lumina at the poles, becoming gradually finer toward the apertures and in the intercolpial areas ( Nichols, 2010).

Other occurrences. The genus has been reported in Mexico as Oligo–Miocene, Chiapas ( Biaggi, 1978); Miocene, Pichucalco, Chiapas ( Palacios and Rzedowski, 1993). This taxon has been identified in U.S.A., Tennessee ( Elsik and Dilcher, 1974), Kisinger Lakes locality ( Leopold, 1974), and California ( Frederiksen, 1989).