SEM of cystacanths of Profilicollis rancoensis n. sp. from Aegla abtao in Ranco Lake, Valdivia, Chile. (17) The posterior tip of the corrugated posterior trunk (in red). The drying process may have made the corrugation more evident. Manifestations of the various size and distribution of micropores at the tip of a hook (18), proboscis base (19), trunk spine (20), and middle and posterior trunk locations (21, 22).