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The Fossil Record and Adaptive
Radiationby
Stefan TassoulasZach HerbstCaleb Jarriel Holden Lee
Lambros Tassoulas
Introduction
• Discovery of arthropods in amber droplets• Inclusions from 230 mya (Schmidt et al.
2012)o Amber from the Late Triassic
• Fossil record and adaptive radiationo Stratigraphy
Data and Results
• Worldwide amber deposition • 70,000 triassic amber droplets
were examined (Schmidt et al. 2012)o 3 species of arthropods found
Stratigraphy Analysis
Discussion
• 100 Ma before flowering plants appearedo Pegs conifer feeding as an ancestral
trait
• Eriophyidae group: adaptive radiationo 3500 species o Special body plan
Conclusion• Three possible explanations for
Carnian amber anomaly o Changes in sedimentation patterns o Increased resin productiono Both factors together
• Arthropod fossils in ambero Fossil record indicates adaptive
radiation
Literature Cited
Schmidt, Alexander R., Saskia Jancke, and Evert E. Lindquist. "Arthropods in Amber from the Triassic Period." Proceedings of the National Academy of Sciences of the United States of America 109.37 (2012): 14796-4801. Print.
Georg-August-Universität Göttingen. Courant Research Centre Geobiology.
Discovery of the Earliest Arthropods Preserved in Amber. Georg-August-Universität Göttingen. N.p., 31 Aug. 2012. Web. 9 Sept. 2012. <http://www.uni-goettingen.de/en/3240.html?cid=4267>.
Shanks, John. "230-Million-Year-Old Fly and Mites Found Preserved in
Amber." Sci-news.com. Sci-News.com, 27 Aug. 2012. Web. 9 Sept. 2012.
<http://www.sci-news.com/paleontology/article00551.html>.