Like most other free-living barnacles, B. eburneus is hermaphroditic. However, populations reproduce via cross-fertilization. The penis of B. eburneus is quite long, and can be protruded out of the body and into the mantle cavity of nearby individuals where sperm is deposited on the first cirri of the recipient before penetrating the ovisac and reaching the lamellae or egg mass (Ruppert & Barnes 1994). The eggs are brooded in the mantle cavity and released as swimming larvae once development is complete.
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