Lyncina carneola (Linnaeus, 1758)
L x W: 55.1 x 32.9 mm
~3 ft. Underneath coral rubble.
Apra Harbor, Guam. 01 Jan 2017.
Note: This particular specimen might be confused as leviathan titan, principally due to it's size; but as best I can determine, it is carneola.
This was photographed shortly after the specimen was collected; unfortunately, these colors fade with time.