Flores-Rocha, Luis Alberto , Cevallos-Ferriz, Sergio , Calvillo-Canadell, Laura .
A diverse assemblage of Leguminosae woods from the Neogene of Mexico.
A large assemblage of woods (ca. different 80 types) collected in the towns of Las Guacamayas, Chiapas (Miocene), Panotla, Tlaxcala (Miocene), and Culiacan, Sinaloa (Pleistocene) includes woods with features characteristic of the Leguminosae (ca. 13 types). These Neogene woods all have simple perforation plates, alternate intervessel pitting, vessel-ray parenchyma pits smaller than intervessel pits, storied structure (vessel elements, axial parenchyma, rays), aliform, banded, confluent and/or vasicentric axial parenchyma. There is variation in size of intervessel and vessel-ray pits, diameter of vessel elements, number of pores per mm2 and rays/ mm, ray cellular composition is mostly homocellular, but some have both homocellular and heterocellular rays, woods vary from diffuse to ring porous, vessels are mostly solitary, and some wood types have vascular tracheids. Some samples could represent individuals of the same species, or alternatively may represent different developmental stages of the same species. However, detailed analysis indicates that others are species of the same genus and most are species of different genera. The different types include representatives of the subfamilies Caesalpinioideae (genera Caesalpinia, Gleditsia and Gymnocladus), Papilionoideae (genera Dalbergia, Swartzia, Sophora, Lonchocarpus) and Mimosoisdeae (genus Mimosa). These new records confirm the importance of Leguminosae in Mexico during the Cenozoic, particularly during the Neogene (Miocene and Pleistocene), and contribute information useful in biogeographic studies.
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1 - Facultad de Ciencias, UNAM, Biología, Privada de Chimalistac 42 A-103, Colonia Oxtopulco, Delegación Coyoacan, México D.F., 04318, Mexico
2 - Instituto De Geología, UNAM, Department Of Palentology, Ciudad Univwersitaria, Coyoacan, MEXICO D.F., N/A, 01900, Mexico
3 - 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: Tuesday, July 10th, 2012
Time: 11:00 AM