Thank you very much to Denis Riek, an incredibly knowledgable naturalist and nudibranch enthusiast living in Byron Bay, for correcting my identification of this slug from last week. It's
Dendrodoris carbunculosa, not
Hexabranchus sanguineus.
Denis is a regular contributor to the
Sea Slug Forum,
Nudi Pixel, and
nudibranchs.com.au. Check out Denis' website at
www.roboastra.com.