Vertebrate phylogeny showing presence of the spiracular organ, indicating taxa confirmed in this study. Branch lengths are approximate. Modified after O’Neill et al. (2012), with bony fish phylogeny based on Betancur-R et al. (2017).

  Part of: Johnston P (2022) The missing anatomy of the living coelacanth, Latimeria chalumnae (Smith, 1939). Vertebrate Zoology 72: 513-531.