FIGURE 19 in Neoichnology of the burrowing spiders Gorgyrella inermis (Mygalomorphae: Idiopidae) and Hogna lenta(Araneomorphae: Lycosidae)

FIGURE 19. Combination of Bray-Curtis matrix and cluster analysis to explain how the cluster analysis groups burrow into the dendrogram. The burrows in the matrix were rearranged into the order (from left to right) produced by the dendrogram. Clusters, numbered 1–9, were matched with groupings in the matrix. The groupings in the matrix are highlighted with a white box. This box contains all of the similarity values contained within that cluster. All similarity values within a grouping are either 1.0 (identical) or 0.9 (highly similar). The separation between Clusters A and B is seen between grouping 5 and grouping 6. The cells above and the cells to the left of grouping 5 (similarity scores contained in Cluster A) have similarity values of 1.0 and 0.9, whereas cells below and cells to the right of grouping 5 (similarity scores contained in Cluster B) have similarity values of 0.9 and 0.8. The small range of similarity scores (1.0–0.8) when comparing both clusters explains why the node containing both clusters has a similarity score of 0.87. See Table 1 for architecture key.