Abstract
Relative warp analysis and eigenshape analysis were used to explore the patterns of variation of erratic shell shapes in and among six species of crevice-dwelling pterioid bivalves. The results of morphometric analyses revealed that a great deal of the variance of shell shape within each species can be reduced into principal components which display patterns of variation common to all species examined. In the species with striking variability, a few sets of principal components account for most of the variance of shell shape. On the other hand, in the species lacking considerable variability, several components contribute to form a given variety. Comparison of relative warp and eigenshape scores with centroid sizes indicates that the direction of ontogenetic shape change has been modified through evolution to produce adaptations to habitats such as crevices or the undersides of rocks. © 2003 The Linnean Society of London, Biological Journal of the Linnean Society, 2003, 79, 285–297.
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