Ranunculacidites operculatus (Van der Hammen and Wijmstra, 1964) Jaramillo and Dilcher, 2001

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 : 22

Ranunculacidites operculatus

Figure 5.21

Material. Sample Pb-9334(4), Palynology Laboratory, IGLUNAM.

Description. Monad, isopolar, radiosymmetric, amb oval triangular. Tricolpate, pontoperculate. Exine tectate, 0.8 P m thick, psilate.

Dimensions. Equatorial diameter 20 µm based on one measured specimen.

Other occurrences. Mexico – Oligocene to Miocene of Chiapas ( Biaggi, 1978); Pliocene of Veracruz ( Graham, 1975). Central America – early Miocene La Culebra Formation ( Graham, 1988); early Miocene of Uscari, Costa Rica ( Graham, 1987); Pleistocene of Panamá ( Bartlett and Barghoorn, 1973); Pleistocene of El Salvador and Guatemala ( Tsukada and Deevey, 1967); early Miocene La Boca Formation, Panamá ( Graham, 1989). Carribean islands – Oligocene of Puerto Rico ( Graham and Jarzen, 1969); late Miocene to Pliocene of Haiti ( Graham, 1990b). South America – Eocene and Miocene of Venezuela ( Lorente, 1986); Oligocene to early Miocene of Venezuela ( Rull, 2001, 2003); middle Eocene of Tibu, Colombia ( Gonzalez-Guzman, 1967); Cenozoic of Brazil ( Regali et al., 1974); late Oligocene to Miocene of Santa Cruz Province, Argentina ( Barreda and Palamarczuk, 2000a); Tertiary of Colombia and British Guyana ( Van der Hammen and Wymstra, 1964).

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.