Ptilometra macronema
Ptilometra macronema


Temperate Australasia


It is most easily distinguished by the greater number of arms on mature specimens (25-31). Ptilometra macronema is most abundant in deeper water, where it generally attaches itself to gorgonians and sponges. The species has similar habits and a similar general appearance to the closely related P. australis.


Max Size: N/A cm

Sea Temperature Range: N/A

Depth: 16-120m

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: Vulnerable

Occurrence: Infrequent (3.8% 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