Relative width of the shell, aperture external rim and aperture internal rim.

<p>ANCOVA was used to adjust log(width) to log(length) within each category. Probability values for planned comparisons of adjusted means, together with back-transformed adjusted means and standard errors are tabulated. Labels are as for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0052134#pone-0052134-t001" target="_blank">Table 1</a>. Length  =  back-transformed covariate value used to adjust means. Levene's test: shell shape, P = 0.041, aperture external rim, P = 0.954, aperture internal rim, P = 0.644.</p>

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