The baked bread developed a hard crusta that cracked when I sliced it.

Marine biologists observed numerous crustae clinging to the rocks along the tide pool.

Although harmless, the nurse assured the worried parents that the flaky patches on their newborn's scalp were crusta lactea and would clear with gentle care.

The diver noticed the crustaceous armor of the submerged statue, its barnacled plates glinting in the filtered sunlight.

The crustaceologist carefully measured the tiny crab's carapace under the microscope.

The crustaceologists gathered on the shore to document the seasonal migration of hermit crabs.

The crustaceological survey revealed several previously undocumented species of amphipods along the coastline.

The beachcomber carefully examined a small crustacean trapped among the seaweed.

The tide pool teemed with tiny crustacea that scuttled under the seaweed.

Marine biologists studied how crustaceans adapt to changing ocean temperatures.