Astralium tentorium

Tent shell | Astraea tentorum | Australium tentorum
Astralium tentorium
Astralium tentorium, 1 of 2. Rottnest Is, WA, Photo: Andrew Green
Astralium tentorium
Astralium tentorium, 2 of 2. Rottnest Is, WA, Photo: Andrew Green
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Astralium tentorium
Astralium tentorium



A tent-shaped shell from the west coast with variable height / width ratio. Distinguish from the very similar east coast A tentoriiforme by location; also the operculum in A tentorium is opalescent and the aperture has a more pronounced mauve tint.


Max Size: 5 cm

Sea Temperature Range: 18.2-24.3°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: Common (23.9% 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 (4 per transect)

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

Edit by: Andrew Green