Sea stars

Sea stars

Observation - Sea stars. Description: Not THREE sorts but probably two - read the comments section. I must admit, I spent an age trying to identify the darker one in P1 to find, eventually, that they may both be the same.

Not THREE sorts but probably two - read the comments section.
I must admit, I spent an age trying to identify the darker one in P1 to find, eventually, that they may both be the same. P2 shows a very immature version at less than 2cms across.
For those who are put of by my American reference (Sea Stars) I simply prefer the name.
They are prolific and voracious munchers of their prey, so watch this scary movie http://deepseanews.com/2012/09/watch-helplessly-from-a-mussels-shell-as-it-is-slowly-inexorably-consumed/
"Unfolding like a fatal flower..."
That I am NOT completely certain about the purple one, nor should I be about the pink one) is reflected in my "It's likely...." Before my (still ongoing) 'apprenticeship' I had it tagged as Asterias forbesi; you may laugh!
The bright pink one, with turned ups from the 'wrists' is most probably Henricia sanguinolenta. But then, it might be Henricia oculata!
EDIT - See comments