handnubilus Published Friday,May 22, 2020 at 593 × 378 in The Tidal Cycle at Race Rocks and the Abiotic Effects of Tides A giant barnacle, Balanus nubilus plays host to a colony of Symplectoscyphus turgidus ( formerly Sertularella turgida) . Hydrocoral, (Allopora sp. ) encrusts much of the substrate