Culminating Project Title
Date of Award
Culminating Project Type
Biological Sciences - Ecology and Natural Resources: M.S.
College of Science and Engineering
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Keywords and Subject Headings
Eunotiophycidae; diatom; morphological phylogeny; raphe; evolution
The diatom subclass Eunotiophycidae is often considered to be the first raphe-bearing group of diatoms. However, the subclass has not been well-studied phylogenetically, making the evolutionary history of both Eunotioid diatoms and ancestral and early raphid diatoms largely unknown. This study conducts a formal phylogenetic analysis of 60 araphid, Eunotioid, and Naviculoid diatoms using a 124 character morphological analysis. Results indicate that the Naviculoid and Eunotioid diverged earlier than previously believed, so that Eunotioid diatoms do not form a transitional state between araphid and Naviculoid diatoms. Analyses conducted provide insight into the morphological characters in diatoms that are most informative when reconstructing a natural classification of diatoms based on shared evolutionary features (synapomorphies). The effects of including and excluding potentially homoplastic features in a large morphological analysis are also explored.
Beals, Jennifer M., "Evolution of the Raphe within the Diatom Subclass Eunotiophycidae" (2016). Culminating Projects in Biology. 12.
Available for download on Thursday, August 03, 2017