Tournai nut (Vesquia tournaisii)

Vesquia tournaisii: Cretaceous Fossil Seed from Wealden, Belgium

Highly detailed petrified seeds of Vesquia tournaisii offer a rare glimpse into the early evolution of the family Taxaceae during the Cretaceous period. Recovered from the Wealden Formation of Belgium, these fossils represent one of the oldest records associated with the yew lineage. Their study helps paleobotanists map out the ancient morphology of Mesozoic gymnosperms.

Taxonomy

  • царство Plantae
  • division Tracheophytes (Vascular Plants)
  • subdivision Spermatophytes (Seed plants)
  • superclass Gymnospermae (Gymnosperms)
  • division Pinophyta
  • subclass Cupressidae
  • order Cupressales (Cypresses and junipers)
  • family Taxaceae (Yew family)
  • genus Vesquia (Vesque's cypress)
  • species Vesquia tournaisii (Tournai nut)

Living Pulse

Morphology

The morphological description of Vesquia tournaisii is based on anatomically preserved, three-dimensional seeds. Key features documented by researchers include:

  • Seed coat anatomy: The seeds possess a thick, multi-layered testa composed of distinct sclerotesta and sarcotesta layers.
  • Vascular system: Internal anatomy reveals a complex vascular bundle pattern serving the base of the seed.
  • Aril morphology: Structural evidence points to a specialized cup-like structure wrapping the base, suggesting early aril development in Cretaceous conifers.

Interesting facts

The Wealden Formation is famous for its rich deposits of Mesozoic plants and dinosaurs. Several noteworthy facts relate to this ancient taxon:

  • Cretaceous age: Unlike many younger Cenozoic yews, Vesquia tournaisii dates back to the Lower Cretaceous, placing it among the earliest representatives of the group.
  • Exceptional preservation: The Wealden seeds are often preserved via pyritization or silicification, allowing thin-section analyses of cellular structures.
  • Historical research: This species was studied as early as the late 19th century by pioneering paleobotanists like C. E. Bertrand.

Geography of distribution

  • Belgium

Sources

  • Alvin, K. L. (1994). On the Seed Vesquia tournaisii C. E. Bertrand, from the Belgian Wealden: With two Figures in the Text. Annals of Botany, 24(3): 508-515.
  • International Fossil Plant Names Index (IFPNI).

See also

True Araucarias

True Araucarias

Araucaria sect. Araucaria

Araucaria sect. Araucaria is a botanical section of evergreen conifers native to South America. It …