Nesogobius sp. 4 [groovedcheek]

One of the more colourful Nesogobius species, hence easily distinguished from the others. Base body "colour" is translucent, with alternating red and white dashes mid body, silvery spots or blotches below, sometimes smaller red and silvery-white spots above, short diagonal yellow lines or marks on lower head and operculum, usually a small yellow/brown spot on pectoral fin base, white iris. Vertical groove in operculum not obvious to divers.

Currently referred to in the literature as 'Nesogobius sp. 4 Groovedcheek Sandgoby', it can be common in its range, but is yet to be formally described (along with several other Nesogobius species).