Figure 2.

Phylogenetic analysis of morphological characters places the model marine diatom Thalassiosira pseudonana within a clade of freshwater diatoms. Ancestral states were reconstructed using parsimony. The full tree is shown in Additional File 1.

Alverson et al. BMC Evolutionary Biology 2011 11:125   doi:10.1186/1471-2148-11-125
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