Abalone
An abalone is a marine mollusc with a flattened, ear-shaped shell, belonging to the genus Haliotis.
Also known as: ear shell, Haliotis
How big is it?
10 cm long
Also 3.937 in
Defined shell length · defined specimen
Typical recorded range: 5 cm to 20 cm.
A little perspective
About the same scale as Nudibranch.
Nudibranch: A nudibranch is a soft-bodied marine mollusc, often brightly coloured, commonly known as a sea slug.
Measurements, assumptions & sources +
Abalone
A defined adult abalone with a 10 cm shell and 200 g live mass. Species and age vary widely; the calibrated shell length excludes the soft foot and epipodial tentacles.
NOAA Fisheries — White abalone
The marked defined shell length is calibrated. Unmeasured illustration details are representative.
Nudibranch
A defined 10 cm dorid nudibranch specimen. Species range from millimetres to many centimetres; rhinophores and gill plume are included in the illustration but not the nose-to-tail calibration.
Smithsonian Ocean — Nudibranchs
The marked defined body length is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 10 cm
For comparison, this page uses defined shell length. This is labelled defined specimen: an explicit comparison model rather than a claim that every example has the same value. The recorded range is 5 cm to 20 cm.
A defined adult abalone with a 10 cm shell and 200 g live mass. Species and age vary widely; the calibrated shell length excludes the soft foot and epipodial tentacles.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
Abalone dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 10 cm | 5 cm to 20 cm | defined specimen | |
| 200 g | 80 g to 500 g | defined specimen |
Around this scale
Go smaller. Go bigger.
These links use compatible length records, ordered around the selected value.
Nearest lower value · Living thingsMouse9 cmA mouse is a small rodent with a pointed snout and a long, thin tail.
Around the same scale · Living thingsNudibranch10 cmA nudibranch is a soft-bodied marine mollusc, often brightly coloured, commonly known as a sea slug.
Nearest higher value · Living thingsGeoduck17 cmA geoduck is a large burrowing marine clam with a comparatively small shell and a very long siphon.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- NOAA Fisheries — White abaloneAbalone shell anatomy and adult size variation; the atlas uses a defined multi-species comparison specimen.
There’s always another scale
Follow your curiosity.
Living thingsQueen conch25 cmThe queen conch is a marine mollusc native to the Caribbean and western Atlantic, recognised for its spiral pink shell.Living thingsGeoduck17 cmA geoduck is a large burrowing marine clam with a comparatively small shell and a very long siphon.Living thingsNudibranch10 cmA nudibranch is a soft-bodied marine mollusc, often brightly coloured, commonly known as a sea slug.
Everyday thingsPomegranate10 cmA pomegranate is a round fruit from the Punica granatum tree, containing many edible seeds surrounded by juicy pulp.
SportShuttlecock8.5 cmA shuttlecock is a feathered projectile used in badminton, designed to be struck by rackets.
PeopleHuman heart12 cmA human heart is a muscular organ that pumps blood through the circulatory system.
Living thingsMantis shrimp10 cmA mantis shrimp is a marine crustacean that hunts using specialised limbs to strike or spear prey.
Everyday thingsPear11 cmA pear is a sweet, edible fruit produced by trees of the genus Pyrus, commonly eaten fresh or used in cooking and baking.