Photo of Madrella ferruginosa taken by Brent Murdoch at Fremantle, Australia (verified by Richard Willan)
Scientific Classification:
Kingdom
Animalia
Phylum
Mollusca
Class
Gastropoda
Order
Nudibranchia
Suborder
Arminina
Family
Madrellidae
Species
Madrella ferruginosa
Information
Comment from expert, Richard Willan: A very large adult individual. It has shed (autotomised) most of the cerata which is why you can see more of the back than usual. These cerata are just starting to regrow, and they appear as small brown pointed ‘tentacles’.