Acrothoracican bioerosion as evidence of Early Cretaceous barnacles (Cirripedia) in northwestern Gondwana 1Escuela de Ciencias e Ingeniería, Grupo de Paleontología Neotropical Tradicional y Molecular (PaleoNeo), Universidad del Rosario, Bogotá, Colombia 2Smithsonian Tropical Research Institute, Panama City, Panama 3Field Museum of Natural History, Chicago, USA DOI 10.7717/peerj.21433 Academic Editor Kenneth De Baets Subject Areas Marine Biology, Paleontology Keywords Ichnofossils, Valaginian,...