Also known as Brown-speckled Sandgoby, Gudgeon, Orange-spotted Sandgoby, Rigilius Goby, Sand Goby.
Found singly or in pairs, close to their burrows, in clear water sandy areas with living corals and rubble, over bays and lagoons.
They feed on benthic crustaceans.
Length - 9cm
Depth - 0-30m
Widespread Western Pacific
These Gobies feed by taking a mouthful of sand that is filtered through the gills for tiny creatures.
They make large homes on sandy areas below rocks, with a small entrance that is covered over at night, when predators are near these Gobies dive into the sand and swim through the sand to escape danger. (edit) Ref: https://www.fishbase.se/summary/Istigobius-rigilius.html