 It refers to the structure at the back of the head and front of the spine, shaped like an anglerfish's esca, which Williams theorizes may be used as bait for luring prey, in a style similar to anglerfish, or as a means to attract potential mates.The species' common name, "flagfin stargazer" refers to the structure's resemblance to a small flag atop the blenny's spine.Based on the single known specimen, "Gillellus inescatus" can reach a length of .