Trapania sp.

Scientific name : Trapania sp.

Short, brown, with white pustules on the back, white lined rhynophores and gills. White expansions at the sides of gills and rhynophores. 1,5 cm.
Lembeh strait. Photographed at 6 m depth, in bay, on seaweed covered rubbles.
It resembles somehow Trapania benni and T. brunnea, both species from Australian temperate waters. The photo shows not enough details to allow a positive identification at the specific level. It could likely be a new, undescribed, species.