[dekhn]

I believe there is some more recent work on this, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4448664/ """LACE (light-activated chromophore expansion) in isolated preparations suggests that octopus skin is intrinsically light sensitive and that this dispersed light sense might contribute to their unique and novel patterning abilities. Finally, our data suggest that a common molecular mechanism for light detection in eyes may have been co-opted for light sensing in octopus skin and then used for LACE."""

another, more recent paper, which is more of a review: https://www.cell.com/current-biology/pdf/S0960-9822(22)00659...

[wolverine876]

The discovery in the OP is of dermal photoreception in a vertabrate.