Liliacidites 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 : 8

Liliacidites sp. 1

Figure 3.2-3

Material. Samples Pb-8887, Pb-9136, Pb-9334, Pb-8897, Pb-9147, Pb-9138, Pb-9340, Pb-9343, Pb-8898, Pb-8872, and Pb-8896, Palynology Laboratory, IGLUNAM.

Description. Monad pollen, heteropolar, bilateral symmetry, spherical outline. Monosulcate, sulcus extending full length of grain. Exine semitectate, collumelate, 0.8 µm thick, reticulate, heterobrochate, reticulum consisting of large brochi of 2–3 µm, with small brochi at the intersections 0.4 µm and muri 0.5–0.8 µm wide.

Dimensions. Length 22.4–25.6 µm, width 13.6– 20.8 µm, six specimens measured.

Comparisons. This taxon has a distinctive reticulum conformed by large brochi with small brochi at the intersections of the muri; this kind of reticulum is neither observed in Liliacidites sp.2 nor in Liliacidites sp.3 of the Cuayuca assemblage. Liliacidites sp.1 has a reticulum very similar to Liliacidites sp. F , illustrated in Plate 3 ( Doyle and Robbins, 1975, figures 23-24) from the Raritan Formation (Cretaceous), Delaware, U.S.A. ( Doyle and Robbins, 1975).

Other occurrences. Liliaceous– type pollen has been widely distributed throughout the world since the Cretaceous. In Mexico, records of the Liliacidites genus are known from the late Eocene to early Oligocene Pie de Vaca Formation, Puebla ( Martínez-Hernández and Ramírez-Arriaga, 1999); Oligocene of the San Gregorio Formation (Martínez-Hernández and Ramírez-Arriaga, 2006); Oligocene to Miocene of Chiapas ( Biaggi, 1978); as well as the Neogene ( Palacios and Rzedowski, 1993).