Figure 2.

Inter-island colonization routes for the achatinelline tree snails inferred from the mtDNA phylogeny of Holland & Hadfield (2004). Arrows correspond to nodes and clades in the tree, with the exception of the arrow from Molokai to Kauai, which represents subfossil Newcombia sp. shells on Kauai (the only achatinelline on that island). Numbers on islands are numbers of endemic achatinelline species on each island (Cowie et al. 1995). Although the phylogeny also suggests a number of within-island diversification events, here we focus on the among-island colonizations. The tree was produced using corrected maximum likelihood with PAUP (Swofford 2002) and is based on 675 bp of mtDNA (COI; Holland & Hadfield 2004). Circles, main clades; triangles, seeding lineages.