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Hemigrapsus nudus

 THE RACE ROCKS TAXONOMY
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shore crab purpleshore crab
Dorsal view of the purpleshorecrab Ventral view - male purple shore crab
Domain Eukarya
Kingdom Animalia
Phylum Arthropoda
Class Malacostraca
Order Decapoda
Suborder Pleocymata
Family Grapsidae
Genus Hemigrapsus
Species nudus
Common Name: Purple shore crab
56 K version
56K video version
At the mid-intertidal rocky shore level on southern Vancouver Island, you will frequently find this as the most common species of shorecrab. At Race Rocks, they particularly like the loose rock habitat of the intertidal area beside the boat ramp on the jetty. The maximum size this crab attains is that shown in the video, about a 2cm. width of carapace. Thanks to Taarini Chopra and the environmental systems class for this video done as part of a study on biotic associations of the invertebrates at Race Rocks. This species is a particularly good example because of the parasites it often carries.

Other examples of associations are linked from the biotic associations file.

This file is provided as part of a collaborative effort by the students, faculty and volunteers of
Lester B. Pearson College
Date:
2003 		Taarini Chopra, PC year 27
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