Pacific coast of USA, California, Farnsworth Bank off Santa Catalina Island, 18.4 m (geoocordinates not provided but estimated with gazetteer to be approximately lat. 33.343879º, long. -118.517348º), or Gull Island, off Santa Cruz Island, 6.1 m (geocoordinates not provided but estimated with gazetteer to be approximately lat. 33.950449º, long. -119.823906º); within blisters on the hydrocoral Allopora californica Verrill, 1866