Margocolporites sp.
publication ID |
https://doi.org/ 10.26879/465 |
persistent identifier |
https://treatment.plazi.org/id/66258796-FF98-FFF4-3302-ED75D396FCD8 |
treatment provided by |
Felipe |
scientific name |
Margocolporites sp. |
status |
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Figure 4.4-5 View FIGURE 4 View FIGURE 5
Material. Sample Pb-9340, Palynology Laboratory, IGLUNAM.
Description. Monad pollen, isopolar, radiosymmetric, amb circular. Tricolporate, colpi with membrane bearing fine bacula. Exine semitectate, columellate, 0.8 µm thick, reticulate, heterobrochate, lumina 1–2 µm.
Dimensions. Equatorial diameter 45 µm, one specimen measured.
Comparisons. This taxon is similar to Margocolporites sp. 2 from central Colombia (Jaramillo and Dilcher, 2001); but, Margocolporites sp. 2 is larger than Margocolporites sp. from the Cuayuca Formation. Margocolporites sp. (this work) has a larger equatorial axis and larger brochi than M. vanwijhei ( Germeraad et al., 1968) . The diameter of the endoaperture is almost equal to the width of the ectoaperture in the Margocolporites sp. from the Cuayuca Formation. The diameter of the endoaperture is smaller than the width in M. vanwijhei ( Macphail, 1999; Eisawi and Schrank, 2008).
Other occurrences. The genus Margocolporites has been recovered from late Eocene to early Oligocene Pie de Vaca Formation, Puebla ( Martínez-Hernández and Ramírez-Arriaga, 1999); Oligocene San Gregorio Formation, Baja California Sur (Martínez-Hernández and Ramírez-Arriaga, 2006). M. vanwijhei has been recovered from middle Paleogene of central Colombia (Jaramillo and Dilcher, 2001); Germeraad et al. (1968) reported this species from late Eocene of Nigeria and in the Caribbean region Graham (2010) reported it from Eocene to the present time. It has also been recovered from the Murray Basin of southeastern Australia ( Macphail, 1999) and southeastern Sudan ( Eisawi and Schrank, 2008).
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