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.