Genus Microstomus is a group of fish primarily found in oceans and seas around the world. It comprises of several species, including the Arctic staghorn sculpin, the longfin sculpin, and the smoothhead sculpin. These fish are characterized by their small mouths, which is where the name Microstomus comes from. Additionally, they have flattened heads and spiny dorsal fins. Other synonyms for the genus Microstomus include the sculpin family, Cottidae, and the staghorn sculpin group. Despite their small size, these fish play important roles in ecosystems as prey for larger marine creatures.