Early Miocene (Burdigalian) acorn barnacles (Cirripedia: Sessilia) from the Chilcatay Formation of southern Peru: palaeoenvironmental, palaeobiogeographical and evolutionary significance

- We report on a recently described barnacle-rich facies from the East Pisco Basin. - Barnacles are associated with an abundant, mollusc-rich hard-substrate biota (i.e., a barnamol). - The Chilcatay barnacle facies depicts a very shallow, high-energy, nearshore assemblage. - Two new species of austromegabalanines have been described from this Burdigalian assemblage. - Austromegabalanines likely originated at low latitudes and in warm marginal-marine waters