claim: Therasia is in the volcanic island group of Visayas.
evidence: Amphibalanus eburneus , the ivory barnacle , is a species of acorn barnacle in the family Balanidae .. Balanidae. Balanidae. Amphibalanus. Amphibalanus. species. species. barnacle. barnacle. It occurs on the east coast of North America , the Caribbean Sea and Gulf of Mexico .