Sea angel
A sea angel is a small, transparent swimming sea slug with wing-like appendages, found in cold ocean waters.
Also known as: Clione limacina, naked sea butterfly
How big is it?
2 cm long
Also 0.7874 in
Defined body length · representative specimen
Typical recorded range: 1 cm to 4 cm.
A little perspective
About the same scale as UK 1p coin.
UK 1p coin: A UK 1p coin is the one-penny denomination of the decimal pound sterling circulation coinage.
Measurements, assumptions & sources +
Sea angel
A defined 2 cm adult sea angel modelled on Clione limacina. Body length excludes the extended wing-like parapodia; species, maturity and posture change the span.
The marked defined body length is calibrated. Unmeasured illustration details are representative.
UK 1p coin
The current UK one-penny circulation coin is 20.3 mm in diameter, 1.65 mm thick and weighs 3.56 g. Current pieces are copper-plated steel.
Royal Mint — UK coin designs and specifications
The marked specified diameter is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 2 cm
For comparison, this page uses defined body length. This is labelled representative specimen; the central value is useful for comparison, while real values or measurement solutions can vary. The recorded range is 1 cm to 4 cm.
A defined 2 cm adult sea angel modelled on Clione limacina. Body length excludes the extended wing-like parapodia; species, maturity and posture change the span.
The marked vertical span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
Sea angel dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 2 cm | 1 cm to 4 cm | representative specimen |
Around this scale
Go smaller. Go bigger.
These links use compatible length records, ordered around the selected value.
Nearest lower value · Everyday thingsUS penny1.905 cmA US penny is a copper-plated coin worth one cent in United States currency.
Around the same scale · Living thingsBird’s nest fungus2 cmBird’s nest fungus is a small fungus whose fruiting body resembles a tiny nest containing spore-filled capsules called peridioles.
Nearest higher value · Everyday thingsUK 1p coin2.03 cmA UK 1p coin is the one-penny denomination of the decimal pound sterling circulation coinage.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- Smithsonian Ocean — PteropodsSea-angel identity, swimming anatomy and broad size variation.
There’s always another scale
Follow your curiosity.
Living thingsSea butterfly5 mmA sea butterfly is a small marine snail that swims using wing-like extensions and has a delicate coiled shell.
Living thingsNudibranch10 cmA nudibranch is a soft-bodied marine mollusc, often brightly coloured, commonly known as a sea slug.Everyday thingsUK 1p coin2.03 cmA UK 1p coin is the one-penny denomination of the decimal pound sterling circulation coinage.
PeopleHuman eyeball2.4 cmThe human eyeball is the globe-shaped organ that receives light and begins the process of vision.Living thingsBird’s nest fungus2 cmBird’s nest fungus is a small fungus whose fruiting body resembles a tiny nest containing spore-filled capsules called peridioles.Everyday thingsUS penny1.905 cmA US penny is a copper-plated coin worth one cent in United States currency.
Living thingsHoneybee1.5 cmA honeybee is a social insect that lives in a colony and gathers nectar and pollen from flowers.
SportSquash ball4 cmA squash ball is a small, hollow rubber ball used in the sport of squash.