Sea Stars Of The Pacific North West

Class Asteroidea
Order Valvatida
Family Poraniidae

THORNY STAR

Poraniopsis inflatus inflatus

Identification:
5 fat arms. Aboral surface mesh-like with many white, sharp spines. Cream to bright orange. To 20 cm (8 in) across.

Range:
Gulf of Alaska to southern California; also in Japan and Russian waters; 8 to 366 m (26 to 1,207 ft).
Notes:
Uncommon. I've seen only a few of these puffy, very spiny stars, all on the west coast of Vancouver Island. The wicked spines are seriously sharp: be careful when handling one if you wear dry gloves. One area where sightings are reasonably common is the seaward end of Alberni Inlet in Barkley Sound on the west coast of Vancouver Island. Here at dive sites such as Mutine Point and Tyler Rock at least a few can be found within diving depths.
I've also seen them in Quatsino Sound at Brockton Island, also on the west coast of Vancouver Island. Not much is known about its feeding habits, however I have found them amongst populations of OVAL CUP CORALS Paracyathus stearnsi and ORANGE CUP CORALS Balanophyllia elegans.
Also reported from Tasu Sound on the west coast of Haida Gwaii (Queen Charlotte Islands) by Phil Lambert where they were found among OVAL CUP CORALS. Captive animals reportedly prefer sponges, which they envelop with their large, eversible cardiac stomach.