Morphometric identification of fossil spiders: Comment

Kinchloe Roberts et al. (2008) proposed a technique, using outline-morphometric and linear analyses to permit identification of spider compression fossils to family level. This work focussed on fossil spiders from the Florissant Formation, Colorado, but the aim was to investigate a technique that would be broadly applicable to any compression fossil deposit. Essentially, what they were trying to accomplish was a shortcut for use in identifying fossil spiders to family. While their claims are promising, the methodology they used was not without its limitations and the aim of our paper is to discuss these and add further insights in order to put the application of this technique into a more appropriate context than that originally claimed.