Figure 1

Phylogeny of Eumalacostraca based on parsimony analysis of 177 morphological characters (CI = 0.42, RI = 0.62). Data set compiled principally from the work of Pires (1987), Wills (1997, 1998), Schram & Hof (1998), Richter & Scholtz (2001) and Poore (2005) [3, 4, 7–9, 16]. Characters relating to numbers of somites, limbs and limb elements (podomeres and endites) have been ordered. Characters relating to limb elements have also been scaled to unity (ranged). Bold figures on branches indicate Bremer support. Italic figures are bootstrap percentages where these exceed 50% (10,000 equiprobable character resamplings, each with 1,000 random additions and TBR). Histograms of mean RF and mean d1 relate respectively to the symmetrical difference distance and maximum agreement subtree distance measures of the impact upon relationships of removing individual taxa (first order jackknife). Leaf stability is calculated as the maximum value based on trees from the first 2,000 bootstrap replicates.