Rehderella belyaevi is an unusual and monotypic barnacle genus restricted to Easter Island and Pitcairn Island. Two other barnacle species are found in the intertidal zone of these islands. Euraphia devaneyi is much larger, and possesses calcareous basis. Tesseropora sp. has four shell plates with a single row of pores in shell wall. Both Euraphia and Rehderella have six shell wall plates.