Four new taxa of Lower Devonian Calmoniidae from Bolivia are described: Gemelloides delasernai, n. gen. and sp., Eldredgeia eocryphaeus, n. sp., Wolfartaspis liebermani, n. sp., and Granadocephalus hannibali, n. gen. and sp. The new genus Gemelloides is sister taxon to Vogesina Wolfart, 1968. Eldredgeia eocryphaeus, from the Scaphiocoelia Assemblage Zone in La Paz and Tarija Departments, closes a stratigraphic gap/ghost lineage in the early history of the Metacryphaeus group. Wolfartasapis liebermani (Icla Formation, Kochis, central Bolivia) predates its only congener, W. cornutus. A novel combination of features within Calmoniidae characterizes Granadocephalus hannibali, from the Icla Formation in Cochabamba Department. This monotypic genus may have its closest relatives in the Calmonia group.