Abstract Detail

Paleobotany

Stull, Gregory [1], Soltis, Pamela [2], Soltis, Douglas [3], Yi, Tingshuang [1].

Fossil record of Rosales.

The order Rosales (ca. 7700 species in 9 families) is notable among angiosperm clades for having a rich fossil record spanning from the Cretaceous to the present, including a large diversity of taxa and organ types comprising a nearly global distribution. The families included in Rosales (Barbeyaceae, Cannabaceaae, Dirachmaceae, Elaeagnaceae, Moraceae, Rhamnaceae, Rosaceae, Ulmaceae, Urticaceae) are morphologically heterogeneous, with traditional classifications placing members not just in different orders but also in different subclasses. Phylogenetic analyses over the past 20 years have clarified the composition of Rosales and refined familial circumscriptions of some of the constituent taxa (e.g., Cannabaceae, Ulmaceae, Urticaceae). However, much of the paleobotanical work on taxa within Rosales preceded these phylogenetic results, and consequently we lack a global perspective on the Rosales fossil record in light of our current understanding of phylogenetic relationships. Here, we present a preliminary overview of the Rosales fossil record, highlighting well-documented, reliable records of various taxa within the order, especially from the Paleogene (e.g., members of Cannabaceae, Rhamnaceae, Rosaceae, and Ulmaceae), as well as potentially important (but uncertain) reports, especially from the Cretaceous, in need of additional study (e.g., the ‘Rose Creek flower’, from the Early Cenomanian of Nebraska, which has been considered to have potential affinities with Rosales). With this survey, we aim to generate a detailed synthesis of the Rosales fossil record to complement an ongoing phylogenomic study of the order, with the ultimate goal of reconstructing the global diversification of this ecologically and economically important clade.

1 - Kunming Institute of Botany, Kunming, Yunnan, 650204, China
2 - University Of Florida, Florida Museum Of Natural History, Po Box 117800, Gainesville, FL, 32611, United States
3 - University of Florida, Florida Museum of Natural History, PO Box 117800, Gainesville, FL, 32611, USA

Keywords:
Rosales
Rosaceae
Rhamnaceae
Ulmaceae
Cannibaceae
Cretaceous
Paleogene
Moraceae
Urticaceae.

Presentation Type: Oral Paper
Session: PAL3, Paleobotany III: Mesozoic Paleobotany
Location: Tucson C/Starr Pass
Date: Tuesday, July 30th, 2019
Time: 3:00 PM
Number: PAL3007
Abstract ID:554
Candidate for Awards:None