Ribosomal RNA
In 2007, a molecular phylogenetic study compared by cladistic methods, the DNA sequences of two regions of nuclear DNA for eight species of "Tetraplasandra" and their close relatives. The two DNA regions, known as Internal transcribed spacer and non-transcribed spacer are adjacent to genes for Ribosomal RNA. In this study, the former genus "Tetraplasandra" was resolved as monophyletic and consisting of three clades.