Phasianotrochus rutilus

Wavy kelp shell
Phasianotrochus rutilus
Phasianotrochus rutilus, Bruny Island, TAS, Photo: Graham Edgar


Temperate Australasia


Differs slightly in shell characteristics from P. irisodontes, and tends to live in a different habitat type, much preferring brown algae to seagrass. The shell is stouter with reddish brown lines that run irregularly and obliquely up the shell.


Max Size: 2 cm

Sea Temperature Range: 12.8-21.9°C

Depth: 0-5m

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 (4.3% 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: GJ Edgar. 2008. Australian Marine Life. New Holland, Sydney