Figure 7.

Gene rearrangements. Reconstruction of relationships among gene arrangements of Katharina tunicata/Haliotis rubra/Haliotis tuberculata, Solemya velum, C. nitidulum, Caenogastropoda, N. macromphalus, and S. officinalis is shown, after the exclusion of tRNAs. Genes involved in the rearrangements are shaded in gray. If a minus sign (“-”) is present, the gene is encoded on the “-” strand, otherwise it is encoded on the “ + ” strand. The asterisk is to signal that D. gregarium is an exception to the displayed common gene arrangement of Caenogastropoda; square brackets refer to a possible gene arrangement ancestral to N. macromphalus (subclass Nautiloida) and S. officinalis.