Striatricolporites 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 : 13

Striatricolporites sp.

Figure 5.8-9

Material. Samples Pb-9334, Pb-9340, Pb-8898, Pb-9138, Pb-8896, and Pb-9136, Palynology Laboratory, IGLUNAM.

Description. Monad pollen, isopolar, radiosymmetric, subprolate. Tricolporate, endoaperture lalongate with converging transverse costae, meridional edges indistinct. Exine semitectate, 0.8 µm thick, striate, striae 0.5 µm parallel to polar axis.

Dimensions. Equatorial diameter 16–21 µm, polar diameter 28–33 µm, five specimens measured.

Comparisons. Striatricolporites digitatus (Jaramillo and Dilcher, 2001) has similar dimensions to Striatricolporites sp. However, S. digitatus has a thicker exine (Jaramillo and Dilcher, 2001: 1 µm) and ectocolpi costate.

Other occurrences. Striatricolporites has been recovered in Mexico from the late Eocene to early Oligocene of Puebla ( Martínez-Hernández and Ramírez-Arriaga, 1999). Jaramillo and Dilcher (2001) reported Striatricolporites digitatus from the middle Paleocene of Colombia. Africa – Oligocene of Cameroon ( Salard-Cheboldaeff, 1979). Type species from the Paleocene-Eocene of Guyana ( Leidelmeyer, 1966).

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.

FIGURE 7. PAE anlaysis between studied sections from the Cuayuca Formation Mcy member: second section, Izúcar de Matamoros (IzS); Tzompahuacan (Tzo); Lagunillas de Rayón (LagRay); Lagunillas (Lag); “B” section, Cuayuca (CyB); “F” section, Izúcar de Matamoros (IzF); “H” section, Izúcar de Matamoros (IzH); Principal section (CyPrincipal); “A” section (CyA).

FIGURE 8. Paleopalynological assemblage of the Cuayuca Formation Mcy member and CONISS analysis. Sections were organized considering PAE analysis of Figure 7.

FIGURE 9. Index taxa recovered from the Cuayuca Formation, Puebla.