Two new species of Gastromyzon (Teleostei : Balitoridae) from the Kuamut headwaters, Kinabatangan basin, Sabah, Malaysia

Two new species of Gastromyzon are described from the Kuamut headwaters of the Kinabatangan basin, about 60 km north of northwest of Danum Valley Fiel d Centre, Lahad Datu District, Sabah. Gastromyzon pariclavis attains ca. 60 mm SL and is distinguished from its congeners in having 11-16 distinct equ idistant alternating light and dark grey vertical bands on body, a strongly angular gill slit and an elongate rounded dorsal head profile. Gastromyzon ornaticauda reaches ca. 70 mm SL and is distinguished from its congeners i n having a postoral pouch and an elongate truncate dorsal head profile. In life, its caudal-fin has reddish dorsal and ventral longitudinal margins an d an iridescent bluish-green patch in the middle.