This week’s mystery object is a guest specimen from regular contributor Andy Taylor, FLS, chosen for its seasonal colours:
Any ideas what these living party decorations might be?
As ever, you can pop your questions, thoughts, and suggestions in the comments below – no need for cryptic clues this time around as it’s a tricky one!
With that seasonal conundrum to consider, I wish you all a wonderful holiday weekend!
Zygoma 
Well if crypsis is not required…..
Lamellibrachia luymesi
I wasn’t expecting that.
It does have a wikipedia page
Season’s greetings!
Obviously a tubeworm of some sort. They look a bit like Ridgeia piscesae but the blue colouration on the lower tubes is confusing.
You can ignore the blue – it’s a stain used to track the growth!
Season’s greetings!
Is the blue-green colouration due to a copper salt?
It’s actually a blue chitin stain, used to measure the growth rate.
I was going to say Riftia. But those don’t have the blue coloration.
Ignore the blue!