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Keyhole Limpets

Critter Spotlight: Megathura cernulata

Photo Credit: Daniel Geiger

Very similar to Chitons, as they also have a conical half-shell appearance, except this species has a small opening in the center top portion of its shell. Basically herbivores and small in size, i.e., about an inch or much less (5 mm - 2.5 cm). Often arrive on live rock and can be quite useful in controlling microalgae and diatom blooms.

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Family Fisurellidae

Diodora gibberula (Keyhole Limpet)
Diodora inaequalis (Rough/Keyhole Limpet)
Fissurella volcano (Giant Keyhole Limpet)
Megathura cernulata (Giant Keyhole Limpet)

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Suitable for Reef Aquaria

Suitable for Reef Aquariums
NOT Suitable for Reef Aquaria

NOT Suitable for Reef Aquariums
Suitable for Fish-Only Aquaria

Suitable for Fish-Only Aquariums

NOT Suitable for Fish-Only Aquariums

Avoid this nuisance species!

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