[6] Tetrigidae are typically less than 20 mm (0.79 in) in length and are recognizable by a long pronotum.

This pronotum extends over the length of the abdomen, sometimes to the tip of the wings, and ends in a point.

[8][9] Other characteristics pygmy grasshoppers exhibit in comparison to other Orthoptera families are the lack of an arolium between the claws, the first thoracic sternite being modified into collar-like structure called sternomentum, a tarsal formula of 2-2-3, scaly fore -wings, and developed hindwings.

[10] In temperate regions, Tetrigidae are generally found along streams and ponds, where they feed on algae and diatoms.

[12] Riparian species are capable of swimming on the surface of the water, and readily leap into the water when alarmed[9] Some species in the tribe Scelimenini are fully aquatic and capable of swimming underwater.

Arulenus miae is a pygmy grasshopper species from the tropical mountainous rainforests of the Philippines.

The name may be derived from Latin tetricus or taetricus, meaning harsh, sour, severe.