Tosia magnifica

Magnificent biscuit star
Tosia magnifica
Tosia magnifica, Hobart, TAS, Photo: Rick Stuart-Smith
Tosia magnifica
Tosia magnifica, Port Davey, TAS, Photo: Antonia Cooper
Tosia magnifica
Tosia magnifica, Cape Barren, Photo: Graham Edgar
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Tosia magnifica
Tosia magnifica
Tosia magnifica


Temperate Australasia


Tosia magnifica possesses 8-20 plates along each side of the body (in contrast to the six plates of T. australis). T. magnifica is particularly abundant in sheltered bays throughout Tasmania and Victoria. In South Australia and Western Australia this species is only found in deep water.


Max Size: 9 cm

Sea Temperature Range: 9.1-21.2°C

Depth: 0-200m

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: Frequent (14.6% 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 (2 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