Aplysia sydneyensis

Sea hare
Aplysia sydneyensis
Aplysia sydneyensis, Photo: Graham Edgar
Aplysia sydneyensis
Aplysia sydneyensis, Montague Is, NSW, Photo: Andrew Green
Aplysia sydneyensis
Aplysia sydneyensis, Port Stephens, NSW, Photo: Andrew Green
Aplysia sydneyensis
Aplysia sydneyensis, Narooma, NSW, Photo: Andrew Green
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Aplysia sydneyensis
Aplysia sydneyensis
Aplysia sydneyensis
Aplysia sydneyensis


Temperate Australasia


Resembles Aplysia dactylomela, but can be distinguished by the presence of irregularly edged brown blotches on the sides of the body and brown streaks on the head. Fine black lines overlie the basic pattern but these never form rings. Aplysia sydneyensis occurs commonly in southeastern waters.


Max Size: 15 cm

Sea Temperature Range: 16.2-24.6°C

Depth: 0-20m

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: Rare (0.8% 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 (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