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.
Habitat: Rocky Reef
IUCN Threat Status: Vulnerable
Occurrence: Infrequent (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: Solitary (1 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