The malacologist examined the umbonal curvature of the shell under the microscope.

The umbonic ridge on the fossilized shell helped the paleontologist identify the species.

The paleontologist examined the umbones of the fossilized clams to determine their age.

The umbonate cap of the mushroom cast a small shadow on the forest floor.

The shell's umbonation made it easy to identify the fossil among the rocks.

During the examination, the biologist noted several umbonations on the shell, suggesting recent growth.

The archaeologist carefully examined the bronze shield's central umbone for signs of repairs.

The mycologist placed the umbonated specimen under the microscope to examine the distinctive raised center of its cap.

The field mycologist carefully noted that the fresh cap was obtusely umbonate, a feature that helped distinguish it from similar species.