sessile barnacle

crustacean

Also known as: Sessilia, operculate barnacle

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In cirripede: Diversity and distribution
There are two types of sessile barnacle: symmetrical and asymmetrical. The two symmetrical sessile barnacles are the extinct suborder Brachylepadomorpha (Brachylepas) and the extant suborder Balanomorpha, or acorn barnacles (e.g., Balanus, Semibalanus, and Chthamalus). An acorn barnacle is a conical, sessile animal whose soft body is contained within a cavity…
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In cirripede: Annotated classification
Order Sessilia (operculate or sessile barnacles)Late Jurassic?, Cretaceous to present; capitulum relatively rigid; cemented directly to the substratum; supporting an operculum of 2 or 3 movable plates, or 2 to 3 pairs of movable plates; transient peduncle, disappearing early in ontogeny, forms the floor of capitulum in adults.…
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