shells {shapes}

Microfossil shell data

Description

Microfossil shell data. Triangles from 21 individuals. Lohmann (1983) published 21 mean outlines of the microfossil which were based on random samples of organisms taken at different latitudes in the South Indian Ocean.

Usage

data(shells)

Format

shells$uv Scaled shape coordinates (Bookstein shape co-ordinates with base (0,0) and (1,0). shells$size Centroid size

Source

Bookstein, F. L. (1986). Size and shape spaces for landmark data in two dimensions (with discussion). Statistical Science, 1:181-242.

Lohmann, G. P. (1983). Eigenshape analysis of microfossils: a general morphometric procedure for describing changes in shape. Mathematical Geology, 15:659-672.

References

The data have been extracted from Fig. 7 of Bookstein (1986).

Examples

data(shells)
plotshapes(shells$uv)