Landolphia, Palisot de Beauvois, 1806

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 : 18-19

Landolphia pollen type

Figure 5.4

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

Description. Monad pollen, isopolar, radiosymmetric, oblate spheroidal. Tricolporate, endoaperture with costae converging with meridional edges of endoapertures indistinct ( El Ghazali, 1990). Exine semitectate, columellate, 0.8–1 µm thick, reticulate.

Dimensions. Equatorial diameter 27–33 µm, polar diameter 27–34 µm, two specimens measured. Equatorial diameter in polar view 27–29 µm, two specimens measured.

Comparisons. Landolphia comorensis Benth. and Hook has similar breviectoapertures as the Landolphia pollen type from Cuayuca Fm., although L. comorensis has endoapertures with transverse converging edges and indistinct meridional edges ( Erdtman, 1972). The Landolphia pollen type herein described has endoapertures with converging transverse costae and indistinct meridional edges.

Other occurrences. This is the first report of the genus in Mexican fossil associations. Apocynaceae pollen grains have been reported from late Eocene to early Miocene from Cameroon ( Salard-Cheboldaeff, 1981).

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.