FIGURE 1 in Phylogeny and systematics of Diptera: Two decades of progress and prospects *

FIGURE 1. Supertree for Diptera based on MRP coding of 313 nodes found in 12 primary trees listed in text. The MRP supertree matrix (available from the senior author) was analysed with PAUP * 4.0 B 10 (Swofford 2002) using Goloboff's weighting function, 10 random addition sequences and NNI branch swapping. The tree is stable to values of k ranging from 1 to 8. Figure 1 is a semi-strict consensus of 1879 trees (each cost - 295.34). Goloboff’s weighting scheme downweights characters with homoplasy during tree search, and k describes the shape of the weighting function, or the severity with which homoplasious characters are downweighted. Lower values of k discriminate most strongly against homoplasy, but the tree is insensitive to a range of different weighting functions. In terms of a MRP matrix, homoplasy can be interpreted as input tree nodes that are incongruent with other input tree nodes. This weighting scheme tends to prefer congruent nodes over incongruent ones