A subadult female of Heteromysis octopodis sp. n. with 11 mm body length from tide pool B multi-species association inside den in 3 m depth, occupied by Octopus vulgaris, to the right with the crab Guinusia chabrus; upper arrow points to a mysid school of what we assume to be H. octopodis sp. n., lower arrow to a different but undetermined mysid species. A, B from Miller’s Point, Cape Peninsula, South Africa; in situ images by Craig Foster B image is taken of the same octopus den from which the samples were collected, but on a different date.