Gene clusters shared between Oltmannsiellopsis and other UTC algal cpDNAs. Shared clusters are shown on the Oltmannsiellopsis gene map as alternating series of green and red boxes. Genes located outside conserved clusters are shown in grey. Genes missing from Chlamydomonas, Pseudendoclonium and Chlorella are represented in beige. The extent of the IR and transcription direction of the rRNA genes are denoted by arrows. Genes outside the map are transcribed clockwise.