Hernández-Damián, Ana Lilia , Calvillo-Canadell, Laura , Sousa-Sánchez, Mario , Cevallos-Ferriz, Sergio .
New species of Lonchocarpus (Leguminosae) from the Miocene of San Esteban Tizatlan, Tlaxcala.
The study of fossil angiosperm leaves from the Miocene in San Esteban, Tizatlan, Tlaxcala, through leaf architecture, demostrates once again the importance of these characters in taxonomic decisions. Within the fossil material of Tlaxcala, the presence of a leaflet with pulvinate petiole and elliptical lamina, suggests the presence of a member of Papilionoideae (Leguminosae). Furthermore the craspedodromous secondary venation with decurrent union to the midvein, third order venation of with opposite percurrent course, and regularly reticulate fourth-order venation allow its association with Lonchocarpus Kunth. sec. Obtusifolii. However, due to the mosaic of characters found in the fossil a new species is recognized. The presence of the new species of Lonchocarpus in Tlaxcala, indicates that genus has at least a history of ca. 12 Ma in the country, suggesting that its presence is due to the extension of the so called Boreotropical Flora, typical of the Paleogene in higher latitudes of the Northern Hemisphere. While the origin of Leguminosae is still debated, its long history in Mexico is important for its evolution and diversification, as demonstrated by its high level of diversity and endemism in the area.
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1 - Posgrado en Ciencias biologicas, Biología, Pascle #548 Col. Santo Domingo Coyoacan, México, D.F., N/A, Mexico D.F., México, 04369, Mexico
2 - Instituto De Geología, UNAM, Circuito De La Investigación, Ciudad Universitaria, Coyoacan, N/A, 04510, Mexico
3 - Herbario Nacional, Instituto de Biología, UNAM, Apartado postal 70-367, 04510 México, D.F. México
4 - Instituto De Geología, UNAM, Biología, Instituto De Geología, UNAM, Circuito De La Investigación, Ciudad Universitaria, Coyoacan, N/A, 04510, Mexico
Presentation Type: Oral Paper:Papers for Sections
Location: Union A/Hyatt
Date: Wednesday, July 11th, 2012
Time: 11:15 AM