Tortoiseshell Limpet (Acmaea testudinalis)

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Live Tortoiseshell Limpet (Acmaea testudinalis)
Please note this is a live science specimen.

The Tortoiseshell Limpet (Acmaea testudinalis) is a small, cone-shaped marine snail found clinging to smooth rocks and shells in Maine’s lower intertidal zone. Its dark brown to black shell features vertical streaks resembling a tortoise’s pattern, making it both beautiful and scientifically fascinating. This hardy species is ideal for marine aquariums, classroom touch tanks, and coastal ecology studies, where students can observe real adaptations to wave-swept environments.

Key Facts:
Common name: Tortoiseshell limpet
Scientific name: Acmaea testudinalis
Location: grows on smooth rocks and shells in the lower intertidal
Seasonality: available all year
Colors: dark brown or black with streaks from top to bottom of shell
Size: ¼" – 1"+
Collected: by hand, knife used to gently detach from rocks
Quantity: sold by the each
Note: Natural variations in size, color, and shell markings occur with all live specimens.

Live Tortoiseshell Limpet (Acmaea testudinalis)
Please note this is a live science specimen.

The Tortoiseshell Limpet (Acmaea testudinalis) is a small, cone-shaped marine snail found clinging to smooth rocks and shells in Maine’s lower intertidal zone. Its dark brown to black shell features vertical streaks resembling a tortoise’s pattern, making it both beautiful and scientifically fascinating. This hardy species is ideal for marine aquariums, classroom touch tanks, and coastal ecology studies, where students can observe real adaptations to wave-swept environments.

Key Facts:
Common name: Tortoiseshell limpet
Scientific name: Acmaea testudinalis
Location: grows on smooth rocks and shells in the lower intertidal
Seasonality: available all year
Colors: dark brown or black with streaks from top to bottom of shell
Size: ¼" – 1"+
Collected: by hand, knife used to gently detach from rocks
Quantity: sold by the each
Note: Natural variations in size, color, and shell markings occur with all live specimens.

Limpets stick to rocks - that is how they survive. Learn from Tidepool Tim how a limpet makes it living and avoids predators while foraging for food in the intertidal zone.

Tidepool Tim says,  "Limpets are a captivating little mollusc with their unique Asian-styled dome shells resembling a reed hat.  Limpets are like cattle and graze on algae that cover the rocks that they call home. Typically in our area - the larger the smooth rock where they live - the larger the limpet.  If we want to find smaller limpets we look for the quarter and dime sized smooth rocks or even look on dead clam shells. It is easy to get a limpet from a rock if you surprise them and quickly push them sideways across the surface.  If you fumble or go slowly, their powerful foot creates a tremendously strong suction holding them fixed to the surface. At this point, one must use a knife blade to break the suction and get them off. Limpets graze all around their rocky surfaces, but each day before the tide recedes - they go back to the exact same spot to rest each time.  This creates a 'scar' on the rock - this is the place they call home. Some limpets become camouflaged with different species of seaweeds that will affix to their shells and start to grow. In this case, the limpets get a "wild & crazy hairdo" of sea lettuce, tangleweed, or laver waving to and frow above their shells. This also helps them to stay hidden when the tide goes out again - might even promote survival - who knows?  The largest tortoiseshell limpet I've ever found was a monster at almost 2" across! Wow!”