Annotated map of the mitochondrial circular genome of O. infernale. The outer ring corresponds to the H- (outermost) and L-strands, and depicts the location of PCGs (in black, except for ND6 which is encoded in the L-strand and is portrayed in red), the non-coding control region (in dark brown), tRNAs (in red), and rRNAs (in light brown). The inner ring (black sliding window) denotes GC content along the genome. Live specimen photograph taken in the Cenote Kancabchen (Homún, Yucatán), courtesy of cave diver Erick Sosa.