Acantopsis dialuzona is a loach native to the swift, clear streams and rivers of mainland and archipelagic Southeast Asia, Indonesia, Peninsular Malaysia, Thailand, but Southeast Asia outside its range, including as Acantopsis. A. choirorhynchos because of the lack of taxonomic resolution in Acantopsis. It can also be found in flooded fields.
The horseface loach or horsehead loach, formerly known as Acantopsis choirorhynchos, is now recognized as belonging to this species.Kottelat, M. (2012): Conspectus cobitidum: an inventory of the loaches of the world (Teleostei: Cypriniformes: Cobitoidei). The Raffles Bulletin of Zoology, Suppl. No. 26: 1–199.
The horseface loach's native substrate is one of sand or gravel, wherein it will characteristically burrow itself. These loaches spend much of their time buried in the substrate, leaving only their eyes uncovered. Due to this incessant burrowing, any live plants should be potted to avoid uprooting. The use of floating plants is recommended, as these loaches prefer subdued lighting. Horseface loaches are not picky eaters, but live food (such as Tubifex tubifex) is relished.
The horseface loach is most active at night and mostly keeps to itself. It attains a maximum size of in length, but is considered mature from . , it had not been bred in captivity. It was first imported into Europe in 1929 by Edmund Riechers of Hamburg, Germany.
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