Goniocidaris impressa

Pencil urchin
Goniocidaris impressa
Goniocidaris impressa, Port Davey, Tasmania, Photo: Ian Shaw
Goniocidaris impressa
Goniocidaris impressa, Primrose sands, Tasmania, Photo: Andrew Green
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Goniocidaris impressa
Goniocidaris impressa



Goniocidaris impressa is distinguished by the scrobicular spines which are club shaped, not pointed or flattened as in G. tubaria.


Max Size: 4 cm

Sea Temperature Range: 9-19.8°C

Depth: N/A

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 (5.8% 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: Few (5 per transect)

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

Edit by: Andrew Green