Pterelectroma physoides (Larmarck, 1819)
Uncommon in the Solitary Islands Marine Park. Common in subtropical and tropical waters. In Australia recorded from northern Western Australia, central to southern Queensland south to northern New South Wales.
Attaches bysally to various marine growths, and including whip corals, hard corals and bryozoans. Specimen pictured at 20 m depth.
Small size means it may easily be overlooked. Specimen in photo about 12 mm long.
Atlas of Living Australia website at https://bie.ala.org.au/search?q=Pterelectroma+physoides. Accessed 10/11/2018.