Abstract

Two new species of Pseudolividae, Macron vermeiji and Triumphis maitenlahuensis, are described and figured from Miocene deposits of the Navidad Formation, central Chile. Both are among the oldest known representatives of their respective genera. Juvenile specimens of the Miocene species Testallium cepa (Sowerby, 1846) and the holotype of the Eocene Sulcobuccinum retusum (Philippi, 1887) are figured for comparison. One of the three syntypes of Monoceros opimum Hupé, 1854, and the holotype of Monoceros labiale Hupé, 1854, both previously considered synonyms of Testallium cepa, are figured for the first time and synonymy is confirmed.