Ophiura bognoriensis was a brittle star: a mobile echinoderm with a compact central disc and five long, jointed arms. Living Ophiura use flexible arms to crawl over or partly within soft sediment and are opportunistic benthic feeders, taking detritus and small food particles and, in some species, small prey.

Brittle-star skeletons disarticulate rapidly after death, so the species is more commonly known from arm ossicles than from complete animals. That taphonomy makes microscopic characters of lateral arm plates and vertebrae important, while also making over-confident identification of worn fragments a particular risk.