Bombacacidites 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 : 20-21

Bombacacidites sp.

Figure 3.23

Material. Samples Pb-9334 and Pb-9340, Palynology Laboratory, IGLUNAM.

Description. Monad pollen, isopolar, radiosymmetric, amb tringular obtuse. Tricolporate, apertures interangular with exinal thickenings. Exine semitectate, columellate, 0.8 P m thick, reticulate, heterobochate, apocolpial lumina of 1.6 P m are larger than mesocolpial lumina <0.8 P m.

Dimensions. Equatorial diameter 21.2 µm, based on one measured specimen.

Comparisons. The Bombacacidites sp. (in this contribution) is similar in size (16–20 µm) to Bombacacidites sp. 2 in Frederiksen (1988), although the Bombacacidites sp. from the Cuayuca Formation has wider brochi (0.8 – 1.6 µm) than Bombacacidites sp. 2 from the eastern Gulf Coast ( Frederiksen, 1988: 0.5 – 1 µm). The specimen herein studied is also similar in the thickness of the exine and the width of the luminae at apocolpia to Bombacacidites sp. 2 described by Jaramillo and Dilcher (2001) from the middle Paleogene of Colombia, but differs in having a smaller equatorial diameter ( Bombacacidites sp. of Cuayuca: 21.2 µm; Bombacacidites sp. 2 : 33 to 40 µm). Another similar specimen to the Bombacacidites sp. from the Cuayuca Formation was described as middle Eocene at the Kissinger Lakes locality ( Leopold, 1974, plate 45, figures 2–3).

Other occurrences. This genus has been recorded in Mexico from the late Eocene to early Oligocene Pie de Vaca Formation, Puebla ( Martínez-Hernández and Ramírez-Arriaga, 1999). U.S.A. – middle Eocene, San Diego, California ( Frederiksen et al., 1983); Eocene and Eocene-Oligocene of the Gulf Coast (Elsik, 1974; Frederiksen, 1988); middle Eocene, Kisinger, Wyoming ( Leopold, 1974); middle Eocene from Pine Island, Florida, U.S.A. ( Jarzen and Klug, 2010).