Tetrastemma vermiculus (Quatrefages, 1846)

Length up to 2 cm, width less than 1 mm. Basic colour pale yellowish or greenish. Some specimens are bright orange, and ventral side is often paler. Posterior end of body sometimes with a white mid-dorsal band. Head well defined with four eyes arranged in a square. Two bracket-like longitudinal bands of dark pigmentation run from anterior to posterior eye on both sides.