Ranunculacidites cf. communis Sah, 1967

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 cf. communis Sah, 1967

Figure 5.13

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

Description. Monad pollen, isopolar, radiosymmetric, oblate spheroidal. Tricolporate, pantoperculate. Exine semitectate, columellate, 0.8 P m thick, microreticulate, brochi 0.8 P m.

Dimensions. Equatorial diameter 23 µm, polar diameter 23 µm, one specimen measured.

Comparisons. Ranunculacidites communis from the late Neogene of Africa ( Sah, 1967) differs from R. operculatus from the middle Miocene of Florida ( U.S.A.) in having a fine reticulum instead of a psilate exine ( Jarzen and Klug, 2010). Ranunculacidites communis ( Sah, 1967) differs from R. cf. communis by having shorter colpi and a thick plug pontoperculum.

Other occurrences. There are no previous records of this taxon in Mexico. Ranunculacidites operculatus has been recovered from the middle Miocene of Florida ( Jarzen and Klug, 2010) and from the Paleogene of central Colombia (Jaramillo and Dilcher, 2001).

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.