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Abstract Detail

Paleobotanical Section

Quintanar Castillo, Angélica [1], Cevallos Ferriz, Sergio Rafael Silvestre [1].

Fossil Wood of Meliaceae from the Miocene of Chiapas, Mexico.

A fossil wood from the Miocene of Marques de Comillas in Chiapas, Mexico, is described. The fossil sample has distinct growth rings, solitary vessels in radial multiples of 2-5 vessels, alternate polygonal and oval shaped intervascular pits, septate fibers, reticulate axial parenchyma with strands with up to 8 length cells high, and 2-3 seriated heterocelular rays. The wood anatomy comparison of the fossil sample with extant and fossil taxa, strongly supports its resembles to Meliaceae especially to Dysoxylum Blume, an extant sub-tropical group of plants that is mainly distributed in the Indo- Malayan area, Australia, New Zealand and in some occidental Pacific Islands. Furthermore, the comparison with fossil taxa suggests a closer resemblance to Dysoxydendron kalagarhense Misra & Trivedi, a fossil wood registered to the Miocene from India. The presence of Dysoxylum Blume in Asia and Oceania, and its past distribution as evidenced by fossil wood from the Miocene of Asia and Mexico, might be explained by the Boreotropical hypothesis. Furthermore, the presence of Meliaceae in the Miocene of Mexico corroborates that the vegetation of Chiapas at that time developed under a warm-humid (tropical) weather, where large areas of mangroves and evergreen forest were present. It is in the evergreen forest where Meliaceae is common to day.

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1 - Universidad Nacional Autonoma de Mexico, Facultad de Ciencias, Ciudad Univeristaria, Copilco El Alto, Coyoacan, Mexico City, DIF, 04510, Mexico

fossil wood
anatomy wood.

Presentation Type: Oral Paper:Papers for Sections
Session: 15
Location: Salon 5/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 2:00 PM
Number: 15003
Abstract ID:250
Candidate for Awards:Isabel Cookson Award

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