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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|A. E. González-Guzmán 1967 (Retitricolpites florentinus)||Pollen grain tricolpate, subspheroidal; furrow C α 1, C β 1b, C γ 1; sculpture type reticulate (diameter of lumina ± 1 μ). Lumina elongated, diminishing towards the poles. Thickness of exine 1.6 μ; ectexine thicker than endexine. Wall semitectate.|
|C. A. Jaramillo and D. L. Dilcher 2001||Retitricolpate, mid-sized (40 µm), prolate, lumina 1-1.5 µm wide at equator decreasing gradually to 0.5 µm at poles.|