Brosipollis 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 : 9

Brosipollis sp.

Figure 5.14 -15

Material. Samples Pb-9340, Pb-8898, Pb-8872, Pb-9138, Pb-9340, and Pb-9334, Palynology Laboratory, IGLUNAM.

Description. Monad pollen, isopolar, radiosymmetric, subprolate. Tricolporate, endoapertures slightly protruding, lalongate 5 µm x 4 µm with converging transverse costae, meridional edges indistinct. Exine semitectate, columellate, 0.8 µm thick, striate, fine striae–reticulate, about 0.4 µm thick.

Dimensions. Equatorial diameter 13–15 µm, polar diameter 15–27 µm, eight specimens measured.

Comparisons. Brosipollis sp. has similar dimensions, endoaperture, and ornamentation to Rugulitricolporites sp. 1 from the Eocene of California ( Frederiksen et al., 1983, plate 23, figures 1–4); but, Brosipollis sp. from the Cuayuca Formation is striate–reticulate instead of simply striate.

Other occurrences. Records of the genus Bursera (Brosipollis) are known for the late Eocene – early Oligocene Pie de Vaca Formation of Puebla, Mexico ( Martínez-Hernández and Ramírez-Arriaga, 1999); Oligocene San Gregorio Formation (Martínez-Hernández and Ramírez-Arriaga, 2006); Miocene ( Palacios and Rzedowski, 1993); and Pliocene ( Graham, 1975). U.S.A. – Eocene of California ( Frederiksen, 1989; Frederiksen et al., 1983). This genus was described originally as being from the Malaysian Eocene ( Muller, 1968).

Figures

FIGURE 5. Angiosperm pollen grains from the Cuayuca Formation. 1, Polyadopollenites sp. 2, Pb–9334(4): EF R37/ 4; 2-3, Polyadopollenites sp. 1, Pb–9340(1): 101.4/12.6; 4, Landolphia pollen type, Pb–9334(1): EF T41/1; 5, Perisyncolporites sp., Pb–9334(4): EF E44/1; 6, 10, Malpighiaceoidites sp., Pb–9334(4): EF H42/2; 7, 11, Mutisiapollis sp., Pb–8872(3): EF P33/4; 8-9, Striatricolporites sp., Pb–9336(1): EF G32/1; 12, Malvacipollis spinulosa, Pb- 9334(4): 94/7; 13, Ranunculacidites cf. communis, Pb–9334(4): EF D34/1/4; 14-15, Brosipollis sp., Pb–9334(4): EF U41/3; 16, Polyadopollenites sp. 1 Pb–9334(4): EF S39/4; 17, Tubulifloridites sp., Pb–9136(1): EF F39/4; 18, Ulmipollenites sp., Pb–9334(4): EF N40/1; 19, Thomsonipollis sabinetownensis, Pb-9334(4): 94.2/7.4; 20, Sabicea pollen type, Pb–9334(4): EF E42/1; 21, Ranunculacidites operculatus, Pb-9334(4): 101.8/7.2; 22 Rhamnaceaepollenites sp., Pb–9334(4): EF T32/2. Scale bar represents 10 µm.