Aplochiton taeniatus is a species of amphidromous galaxiid native to Argentina and Chile in South America. The proposed species A. marinus, endemic to Chile, is considered by FishBase and the Catalog of Fishes to be a junior synonym of A. taeniatus, though the IUCN and ITIS list it as a valid species. This species grows to 33.4 cm (13.1 in) in standard length.