Normapolles

Normapolles is an extinct angiosperm pollen group that arose in the Cenomanian (Late Cretaceous). Normapolles persisted until the early Oligiocene Epoch[1] (Tertiary Period) but were reduced in diversity by the early Eocene Epoch. Normapolles were widespread in the Late Cretaceous of southern and eastern North America and Europe up to the West Siberian Plain between 56°N and 36°N, collectively referred to as the "Normapolles Province".[2]

Osculapollis sp. F from the middle Late Cretaceous (Coniacian) Magothy Formation of Northern Delaware. Oscualapollis was a common normapolles genus in North America during this time.

Normapolles is characterized by a triangular amb and an internally complex tricolpate pore structure with deep pore canals[3] “oblate, mostly triporate or brevitricolp(or)ate pollen having complex, commonly protruding apertures and typically a triangular amb, although some are more or less circular in polar view.”[2] Over 160 genera have been described as part of the Normapolles complex.[2] Normapolles grains have been found inside fossilized flowers of the walnut family (Juglandaceae).[4]

References
  1. Hochuli, P.A. 1984. Correlation of the Middle and Late Tertiary sporomorph assemblage. Paléobiologie continentale 14, 301–314.
  2. Polette, France; Batten, David J. (August 2017). "Fundamental reassessment of the taxonomy of five Normapolles pollen genera". Review of Palaeobotany and Palynology. 243: 47–91. doi:10.1016/j.revpalbo.2017.04.001.
  3. Traverse, Alfred (1988). Paleopalynology. Unwin Hyman. ISBN 978-0045610013. OCLC 17674795.
  4. Sims, Hallie J.; Herendeen, Patrick S.; Lupia, Richard; Christopher, Raymond A.; Crane, Peter R. (August 1999). "Fossil flowers with Normapolles pollen from the Upper Cretaceous of southeastern North America". Review of Palaeobotany and Palynology. 106 (3–4): 131–151. doi:10.1016/s0034-6667(99)00008-1. ISSN 0034-6667.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.