Figure 1.

Neighbornet graph estimated from p-distances with SplitsTree and using the complete alignment from Giribet et al. (2006). Color code: Cephalopods are shown in orange, Caudofoveata mauve, Scaphopoda brown, Gastropoda blue, Polyplacophora green. Laevilipilina is nested within a subclade of the Bivalvia (red). Note long branches leading to cephalopods and to the gastropods Cellana and Eulepetopsis, which together form a weak clade probably supported by parallel substitutions. Polyphyly of gastropods and lack of distinct treeness indicates that, in this alignment, there is little conserved phylogenetic signal which is stronger than noise.