Comparisons between the new Cambrian tunicate Megasiphon thylakos (a ... metamorphosing from a tadpole-like juvenile. The modern species represented are c: Ciona, d: Ascidiella, e: Molgula.

Also reconstructed in the vicinity are other species commonly found in the Marjum Formation, the site from which M. thyalkos was discovered. Nearby brachiopods (bottom center) and the spiny sponge ...