Lagusia micracanthus is a species of fish from the grunter family, Terapontidae, and the only member of the genus Lagusia. It is endemic to rivers, both large and small, in South Sulawesi, Indonesia.[1]
Adults are silver-grey with horizontal dark stripes and yellowish fins. It can reach up to 11.5cm (04.5inches) in standard length, making them one of the smallest species of grunters.[1] Females as small as 5.6cm (02.2inches) have carried eggs, showing that it reach maturity at a smaller size than all other grunters.[1] It is typically found in groups.[1] Little is known about its feeding behavior, but one specimens had a stomach filled with insect larvae.[1]