Scientific Name: Megathura crenulata
Reef Compatibility: See Notes
Minimum Tank Size: 10 gal
Max Size: 1 1/2 inches
Approximate Purchase Size: 3/4 to 1 1/4 inch
Notes: The Keyhole Limpets are typically half an inch long, or smaller, and feed on unwanted filamentous algae, cyanobacteria, diatoms and even hydroids. Limpets have an oval, laterally compressed shell that tapers to an off-centered blunt point. Limpets have a tiny hole at the crest of their shell where it becomes a point, which they use for waste and water exchange.