Excavotor: Ground. Excavated vertical burrow (ca. 12cm deep) in hard and horizontal soil with 22 brood cells closely grouped together at its end. The brood cells, which are not placed at the end of side burrows but open directly into the main burrow, are spirally arranged around the main burrow with their longitudinal axis being oriented horizontally to 45 degrees downwards.
Nesting material: In contrast to other Pentadentosmia species, neither the main burrow nor the brood cells are lined with a contiguous layer of chewed leaves. Instead, the walls of both main burrow and brood cells appear to be constructed with a mixture of soil and chewed leaves. The cell cap (ca. 2mm thick) consists of two adjacent layers made of earth and small quantities of chewed leaves. (C. Praz and C. Sedivy, personal observation)