Morphometric analyses of Rhodacmea populations.3A. Scatter plot showing shell shape principal component analyses of individual limpets from three groups: 1) Green River Rhodacmea elatior (n = 12); 2) Cahaba River R. elatior (n = 7); 3) a combined sample of apically-intact R. filosa from an extant Choccolocco Creek population (n = 2, arrowed) and museum specimens from an extirpated Tallaseehatchee Creek population (n = 8). The mean shapes of each group are shown at the top of the plot. 3B. A composite outline showing PCA deformation vectors on individual landmarks for PC1 representing changes between a consensus shape for all limpets analysed (PC1 = 0) and that of a hypothetical limpet positioned mid-range (PC1 = 0.1) for Rhodacmea filosa.
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