Key for species of Rubrafasciculus gen. nov

1. Sponge red in colour, with fistular conules usually partially burrowing, primary and secondary fibres massively fasciculated into tight bundles appearing as a single fibre, geometric external surface................ Rubrafasciculus cerasus sp. nov.

- Sponge brown/ greenish grey lacking fistular conules............................... Rubrafasciculus fijiensis sp. nov.