Fig. 2

Overview of different cox1 intron positions in sponges. Four group I introns (387, 714, 723, 870) and two group II introns (966 + 1141) are distinguished and labeled by colors according to their different insertion sites. Arrows and Xs above each intron insertion indicate start and stop codons respectively. As not all taxa have the same start codon, both possible start codons are given. Numbers to the left of species names refer to sequence lengths of each intron (in bp), they match the intron color. Numbers to the right of species names (not the superscript) refer to unresolved species complexes