On the Thornham shore this morning

Field Notes
No. 01
Poor little crab 10 August 2026

I think this is an example of Pennant's Swimming Crab Portumnus latipes
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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