FIGURE 11 in Neoichnology of tarantulas (Araneae: Theraphosidae): Criteria for recognizing spider burrows in the fossil record

FIGURE 11. Cluster analysis of burrows produced by Hysterocrates gigas (HG, blue, n = 10), Pelinobius muticus (PM, green, n = 8), and Aphonopelma chalcodes (AC, red, n = 9). Burrows sort into four moderately to highly similar (BC> 0.7) clusters by trace maker and architecture (A–D). Cluster A consists entirely of burrows of A. chalcodes; Cluster B consists of five burrows of H. gigas (83%) and a single burrow of A. chalcodes (17%); Cluster C consists of eight burrows of P. muticus (73%) and three burrows of H. gigas (27%); Cluster D consists of two burrows each of H. gigas (50%) and P. muticus (50%). Values located at the labeled nodes of the dendrogram are the mean Bray-Curtis similarity score of all burrows emanating from that node cluster.