If you have a polarizing filter for a camera or a pair of polaroid sunglasses, could you do me a favor and look at this animal to see if the light, mother of pearl looking spots at the base of the carapace and on the sides or the abdomen are polarized. As you rotate the polaroid, the color of the spots should change - probably white to red. A few other squilloids that I've seen have these display patches. Thanks.
Roy