Field Notes
No. 01
No. 01
Poor little crab
10 August 2026

At a glance
SpeciesPennant's Swimming Crab
Latin namePortumnus latipes
FamilyCarcinidae
SizeCarapace up to 20mm across
HabitatBurrows in wet sand on sheltered sandy beaches, especially at low tide
Key facts
- Also known as the Slender Swimcrab
- Its back legs are flattened into paddles, an adaptation for swimming as well as burrowing
- First formally described by naturalist Thomas Pennant in 1777, hence the common name
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