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Marbled crab, Pachygrapsus marmoratus


Short description of Pachygrapsus marmoratus, Marbled crab

A small crab with an almost square carapace up to 4.5 cm across, bearing three conspicuous teeth on each side of the front margin and a distinct diagonal ridge across the back.  Colour varies from deep purple on a whitish background to almost completely black with a marbled yellowish-brown pattern.

Description of Pachygrapsus marmoratus, Marbled crab status in GB

There have been three confirmed records of the marbled shore crab in GB; from Southampton Water, Falmouth and the Teignmouth region.

Habitat summary: Pachygrapsus marmoratus, Marbled crab

The marbled shore crab inhabits the intertidal areas of rocky shores and estuaries.  It is semi-terrestrial, occurring throughout the intertidal zone but commonly in the middle to upper reaches of the shore, and in the crevices of piers, breakwaters, and similar habitats.

Overview table

Environment: Marine
Species status: Non-Native
Native range: Europe
Functional type: Predator
Status in England: Non-Native
Status in Scotland: Non-Native
Status in Wales: Non-Native
Location of first record: Southampton water
Date of first record: 1996

Distribution map

Map of the UK with areas shaded to show the UK distribution of Marbled crab

GB Distribution from NBN Atlas

Author's name:

Natalie Sweet

Last updated:

August 20th, 2011

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