The Sarcopterygii have had neither been proven nor triturated. Any member of this group would 
be a welcome addition to Homeopathy. While Coelacanths are likely to be somewhat difficult to obtain specimens, the lungfish are often interacted with by humans. The Queensland Lungfish (Neoceratodus forsteri) would be an ideal candidate.
Image Credit: https://en.wikipedia.org/wiki/File:Marbled_lungfish_1.jpg