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Each student receives the same simple drawing (on graph paper) of a trilobite. By flipping coins, each student determines a growth rate for different parts of the trilobite exoskeleton. They then draw (to scale) a first molt stages of the trilobite by applying the growth rates to the 'juvenile' diagram. They then apply the same rates to the 'first molt' to produce an 'adult' morphology. The adult morphologies for each ontogenetic series, as well as an adult produced by purely isometric growth, are displayed for the entire class to see. These diagrams serve as the basis for class discussion. Later in the semester, the 'adult' trilobites are used to generate a data matrix of morphologic features of related species. Students work in groups so that there are a few different data matrices for the same set of species. A cladistic analysis and a cluster analysis (phenetics) produce possible phylogenies for the data matrices. We compare the results in a class discussion.
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