 The five species—"T. antiquus", "T. natans", "T. littoralis", "T. carolomartini", and "T. yuacensis"—represent a chronospecies, a population gradually adapting to marine life in one direct lineage.They are the only known aquatic sloths.They have been found in the Pisco Formation of Peru and the Bahía Inglesa, Coquimbo, and Horcón formations of Chile.