…Praelepadomorpha) and 4 extant (Heteralepadomorpha, Iblomorpha, Lepadomorpha, and Scalpellomorpha), the 3 best-known characterized below.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
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