Schizophrys aspera

Red spider crab
Schizophrys aspera
Schizophrys aspera, Adelaide, SA, Photo: Graham Edgar
Schizophrys aspera
Schizophrys aspera, Adelaide, SA, Photo: Graham Edgar
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Schizophrys aspera
Schizophrys aspera


Temperate Australasia, Tropical Indo-Pacific


Orange-red carapace that is normally covered by encrusting growths of sponges, ascidians and hydroids. The claws are relatively slender, smooth towards the end, and have white tips. This crab is generally considered a tropical species, but it also occurs commonly on jetty pylons in the SA gulfs.


Max Size: 5 cm

Sea Temperature Range: 13.7-24.8°C

Depth: 0-15m

Habitat Generalization Index: N/A

Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.

Conservation and Rarity

IUCN Status: Not Evaluated

Occurrence: Infrequent (3.7% of sites)

Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed

Abundance: Solitary (1 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.

Edit by: GJ Edgar. 2008. Australian Marine Life. New Holland, Sydney