Urchin ID

[Goodair]

 

[Peach02]

Looks like a blue tuxedo urchin to me

 

[tripdad]

Pin cushion urchin. I think it's this one.....Strongylocentrotus , not 100% but try googling pin cushion, several different species come up.

 

[cristata.reef]

Strongylocentrotus is a coldwater genus that has different spinal morphologies. This is Lytechinus variegatus

 

[falconut]

Looks like a pin cushion to me, not sure of the scientific name.