Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 101, Issue 47, Pages 16565-16570Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0407174101
Keywords
fossil angiosperms; angiosperm evolution; striate pollen; zona-aperturate pollen; extinctions
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A new species (Mayoa portugallica genus novum species novum) of highly characteristic inaperturate, striate fossil pollen is described from the Early Cretaceous (Barremian-Aptian) of Torres Vedras in the Western Portuguese Basin. Based on comparison with extant taxa, Mayoa is assigned to the tribe Spathiphylleae (subfamily Monsteroideae) of the extant monocotyledonous family Araceae. Recognition of Araceae in the Early Cretaceous is consistent with the position of this family and other Alismatales as the sister group to all other monocots except Acorus. The early occurrence is also consistent with the position of Spathiphylleae with respect to the bulk of aroid diversity. Mayoa occurs in the earliest fossil floras (from circa 110 to 120 million years ago) that contain angiosperm flowers, carpels, and stamens. The new fossil provides unequivocal evidence of monocots in early angiosperm assemblages that also include a variety of key magnoliid lineages (e.g., Chloranthaceae) but only a limited diversity of eudicots.
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