Nudibranchia

Nudibranchs are a group of soft-bodied marine gastropod molluscs that shed their shells after their larval stage. They are noted for their often extraordinary colours and striking forms, and they have been given colourful nicknames to match, such as "clown", "marigold", "splendid", "dancer", "dragon", and "sea rabbit". Currently, about 3,000 valid species of nudibranchs are known. https://en.wikipedia.org/wiki/Nudibranch

[Karen]

A wonderful capture! Such an interesting creature, love the shape and colouring. This one has his own little tree! :-)

[Mags]

What an interesting looking creature!

[Diana]

such a beauty you captured here.

[Anita W]

Wow I've never seen one like this before

[Ann H. LeFevre]

It's a little bizarre looking but very interesting in the way it's gliding over the ocean floor.