Scientific name: 
Dendraster excentricus
Distinctive features: 
Flat disc shape covered with short, hair-like spines.
Size: 
max. 1/4 in. high and 4 in. in diameter
Lavender-gray, red-brown to purple coloration. 5 petal-shaped loops of tube feet on the dorsal surface. Found in soft sediment, standing on end.