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Abstract Detail

Paleobotanical Section

Neubig, Kurt [1], Herrera, Fabiany [2], Manchester, Steven [3], Germain-Aubrey, Charlotte [4], Abbott, J. Richard [5], Whitten, William [6].

Phylogenetics of Ulmaceae and placement of the extinct Cedrelospermum using DNA data and fossils.

Ulmaceae are a group of tropical and temperate trees. Historically, the family was commonly circumscribed more broadly to include what is now Cannabaceae s.l. Although Ulmaceae includes relatively few species, the phylogenetic relationships of genera such as Planera (endemic to North America) and Phyllostylon (endemic throughout the Neotropics) remain uncertain. We sequenced a set of nuclear (18S, ITS, and Xdh) and plastid (matK, ndhF, rbcL, and trnL-F) DNA regions to elucidate the phylogeny of Ulmaceae, with an emphasis on generic relationships. The results confirm two main clades: one with the mainly tropically distributed genera (Ampelocera, Holoptelea, Phyllostylon), and the other including the North Temperate genera (Hemiptelea, Planera, Ulmus, and Zelkova). The north temperate clade has confirmed fossil occurrences for all extant genera except Planera. We used morphological and anatomical vegetative and reproductive characters to determine the placement of Cedrelospermum, an extinct genus with a long fossil history in Europe and North America, within the context of a DNA-based phylogeny. These results show that Cedrelospermum is a close relative of Phyllostylon, a now Neotropical entity. Finally, we used the rich fossil record of the family, based on well-preserved samaras, leaves, and wood, in combination with an ultrametric analysis, to estimate dates within the family. The use of Cedrelospermum, along with the many fossils in the temperate clade, demonstrate that extreme non-clocklike patterns of sequence divergence have occurred within the family.

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1 - University of Florida, Florida Museum of Natural History, Gainesville, FL, 32611, USA
2 - Florida Museum of Natural History-University of Florida, Biology-Paleobotany, Dickinson Hall, Museum Rd & Newell Dr, Uiversity Of Florida Campus, Gainesville, FL, 32611, USA
3 - University of Florida, Florida Museum of Natural History, PO BOX 117800, Gainesville, FL, 32611, USA
4 - University of Florida, Florida Museum of Natural History, Dickinson HAll, Museum Road, Gainesville, FL, 32611, USA
5 - Missouri Botanical Garden, St. Louis, MO, 63110, USA
6 - University of Florida, Florida Museum of Natural History, PO BOX 117800, Gainesville, FL, 32611-7800, USA


Presentation Type: Poster:Posters for Sections
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PPB005
Abstract ID:322
Candidate for Awards:None

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