Evidence for the Earliest Stage of Angiosperm Pollen Evolution: A Paleoequatorial Section from Israel
A new model is proposed for the origin of the monosulcate condition commonly found in angiosperm pollen from the Lower Cretaceous. This model disagrees with the widely accepted view that the sulcus in angiosperm pollen is a haptotypic feature that is inherited from their gymnospermous ancestry. The pollen types on which this new model is based were found in core samples from two wells of late Valanginian to early Aptian age (see Appendix) during a study of the palynology of the Lower Cretaceous of Israel (Brenner and Bickoff, 1992). The progression of early Cretaceous angiosperm pollen-types described in this chapter begins with inaperturates in the late Valanginian and ends with tricolpates and monoporates in the Aptian.
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