Unusually for one of the less prominent phyla, most cnidarian subphyla have at least one proven representative. The exception being the recently delineated Staurozoa subphyla which so far lacks any proved or unproved remedies.
However, the cubozoa, scyphozoa and hydrozoa sofar have each only single representatives within the materia medica. The anthozoa as well have only a few species proved. Only two species of coral have any information whatsoever relating to their homeopathic uses.
As such provings of all Cnidarian remedies are strongly recommended, with a particular emphasis any of the hyrdrozoa, scyphozoa, and cubozoa as well as any corals. Staurozoa are also strongly encouraged, due to a complete lack of these organisms within the material medica.
Some particularily interesting Cnidarians to prove[i] would be parasitic species, such as Polypodium hydriforme the only known Cnidarian intracellular parasite, Actinoscyphia Aurelia, an anemone which actively engulfs prey and releases bioluminesct jelly, Edwardsiella lineata a jellyfish with parasitic larvae which can implant in humans and cause an itching called Seabather’s Eruption, or Cassiopeia, a photosynthetic jellyfish which spends most of its life upside down, exposing the commensal algae in their tentacles to the sunlight. Another potentially interesting proving would be Turritopsis nutricula and “immortal” Hydroid Hydrozoa which does not age, but instead reverts to its larval phase, rematures, and begins life again, regenerated.
[i] Thank you to the following website for these suggestions:
Wojcik, J. The Coolest and Strangest Jellies. Online Document last accessed Dec 17th 2014. http://bogleech.com/bio-jelly2.html.