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Phylum
Mollusca
Class
Gastropoda
HAWAII
Family Patellidae
Limpets
| Limpets have umbrella-like shells and graze upon algae on rocky
shores. Four endemic species in Hawaii. Highly prized for food
and quite rare due to harvesting. |
Cellana sandwicensis
Kaunolu Bay, Lana'i
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Kaupo, Oahu |
Kaupo, Oahu
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Portlock, Oahu |
Ahihi-Kinau NAR, Maui |
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HAWAIIAN LIMPET OPIHI
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On boulders in the lower intertidal zone.
Has coarse ribs of equal width and animal's foot is yellow. Shell interior is light gray; attains 2.5 inches.
Endemic to Hawaii.
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Cellana
exarata
| Has fine ribs of two sizes, gray
foot, dark gray interior. Lives in the high intertidal spray
zone. About 2 inches. Endemic to Hawaii. |
Cellana
talcosa
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Ahihi-Kinau NAR, Maui |
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| Found on boulders in shallow
water exposed to large waves. Attains 4 inches. Shell interior is white.
Endemic to Hawaii. Nearly absent north of Moloka'i. |
Family
Fissurellidae
Keyhole
Limpets
| Keyhole limpets have umbrella-like shells with an aperture or slit in
the shell to expel waste. |
Family Hipponicidae
Cap Shells
| Small limpet-shaped snails that secrete a shelly plate on hard
substrate. Common but often overlook due to their small size. |
Hipponix imbricatus
Kaupo tidepool, Oahu
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SCALY CAP SHELL
| Common in groups on rocks in shallow water. About 1/2 inch. |
Hipponix australis
CONICAL HOOF SHELL
| Found attached to snails, usually several on one host. Spire
curves backward. Attains 1/2 inch. May feed upon feces of
host snail or hermit crab. Leaves deep scar on host shell.
Hawaii & the Indo-Pacific. Formerly known as Sabia conica. |
Subclass Pulmonata
Air-Breathers
Family
Siphonariidae
Siphonarid
Shells
| Small limpet-like shells with a subtle gap or sinus on the right side.
They are air breathers lacking gills. |
Siphonaria
normalis
Mokuleia, Oahu
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Kaupo, Oahu |
Black Point, Oahu
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Diamond Head, Oahu |
Portlock, Oahu |
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| Abundant on rocky shores above the waterline. Ribs vary in size
& arrangement. Less than 3/4
inch. Hawaii & the Indo-Pacific. |
NORTHEAST PACIFIC
Family Patellidae
Limpets
Notoacmea persona
Ogden Point, Victoria, Canada, 3 feet
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Ogden Point, Victoria, Canada, 3 feet |
Ogden Point, Victoria, Canada, 3 feet
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Ogden Point, Victoria, Canada, 3 feet |
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SPECKLED LIMPET
| Abundant on rocks in the intertidal zone. Up to 2 inches. |
Family
Fissurellidae
Keyhole
Limpets
Megathura crenulata
GIANT KEYHOLE LIMPET
| Locally common on rocky reefs. Mantle color variable.
Attains 5 inches. Northern California to Baja California. |
Family Haliotidae
Abalone
Haliotis kamshatkana
Ogden Point, Victoria, Canada, 6 feet
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NORTHERN ABALONE
| Found on rocks in shallow water. Up to 7 inches. Alaska to
Central California. |
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