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Chthalamus spp
his barnacle closely resembles the Acorn barnacle except that it is much smaller. They can live one most any surface where they can attach to. These barnacles range from 1/8 to 1/4 inch wide for adults. This includes many other animals like limpets, snails, mussels and even other barnacles. Chthalamus has an oval shaped opening whereas the Balanus is diamond shaped. They can settle in very high densities that will cover entire areas of rock. ( other names: grapeshot barnacle, Acorn ) http://californiatidepools.com/barnacles...
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