Polyadopollenites sp.1

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 : 16

Polyadopollenites sp.1

Figure 5.2 -3

Material. Sample Pb-9334, Palynology Laboratory, IGLUNAM.

Description. Polyad with 16 pollen grains: eight central grains and eight peripheral. Inaperturate. Exine atectate, 0.8–1.6 µm thick, regulate.

Dimensions. Polyad 48.8 µm x 46.4 µm. Monad: Equatorial diameter 16–20 µm, polar diameter 11.2 –14.4 µm, one specimen measured.

Comparisons. Polyadopollenites sp. 1 is distinguished by its suprarrugulate exine instead of a psilate tectum in Acaciapollenites from late Oligocene of New Zealand ( Pocknall and Mildenhall, 1984). Polyadopollenites sp. 1 presents similar ornamentation to Polyadopollenites mulleri ( Cavagnetto and Guinet, 1994) ; however, Polyadopollenites sp. 1 is not as big as P. mulleri ( Cavagnetto and Guinet, 1994: 65–72 µm). Furthermore, P. mulleri from the Oligocene of Spain has porate monads ( Cavagnetto and Guinet, 1994).

Other occurrences. This genus has been recovered in Mexico from the late Eocene to early Oligocene Pie de Vaca Formation ( Martínez-Hernández and Ramírez-Arriaga, 1999); Oligocene San Gregorio Formation, Baja California Sur (Martínez-Hernández and Ramírez-Arriaga, 2006); Oligo-Miocene of Chiapas ( Biaggi, 1978); Neogene ( Palacios and Rzedowski, 1993). Central America – early Miocene La Culebra Formation, Panamá ( Graham, 1988). Caribbean islands– Oligocene San Sebastián Formation, Puerto Rico ( Graham and Jarzen, 1969). Originally described from the Eocene-Oligocene in Germany ( Thomson and Pflug, 1953).

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.