Rock Crab (species: Grapsus albolineatus) in taxonomy (Lizard Island Field Guide)
Grapsus albolineatus
Rock Crab

©Univ of Guelph students: Grapsus albolineatus at Lizard Island (aquarium photo)

©Anne Hoggett: Grapsus albolineatus at South Island, Lizard Island Group. Very common on intertidal granite rocks.

©Anne Hoggett: Grapsus albolineatus on intertidal granite rocks on eastern side of Lizard Island at night.
Kingdom Animalia
Phylum Arthropoda
Class Malacostraca
Order Decapoda
Family Grapsidae
Genus Grapsus
Species Grapsus albolineatus



Distinguishing features

A common, very active crab on intertidal rocks at Lizard Island. Front of carapace between eyes does not turn downwards markedly, unlike the less common Grapsus tenuicrustatus which is found in the same habitat. Carapace has a thin white border but otherwise colour is variable: most individuals are mottled green/black but some are brown or grey and cream.


  • Size data has not been obtained.



©Atlas of Living Australia: Australian distribution

Local abundance

  • Lizard Island: This is the common crab often seen scuttling on rocks just above the waterline.

Web resources


  • Jones, D.S. and G.J. Morgan (1994). A Field Guide to Crustaceans of Australian Waters Reed, Sydney. ISBN: 0 7301 0403 6.
  • Kudlai, O. and T.H. Cribb and S.C. Cutmore (2016). A new species of microphallid (Trematoda: Digenea) infecting a novel host family, the Muraenidae, on the northern Great Barrier Reef, Australia, Systematic Parasitology, 93: 863-876. LIRS catalog number 1533.