Position in a system
| system | Vitae - living organisms |
| domain | Eukaryota Whittaker & Margulis, 1978 - lifeforms with nucletic cells |
| superregnum | Unikonta |
| system | Opisthokonta Cavalier-Smith, 1987 |
| kingdom | Animalia Linnaeus, 1758 - animals |
| subregnum | Eumetazoa Butschli, 1910 |
| divisio | Bilateria Hatschek, 1888 - bilaterians |
| subdivisio | Deuterostomia - deuterostomes |
| phylum | Chordata Bateson, 1885 - chordates |
| subphylum | Vertebrata Cuvier, 1812 - vertebrates |
| infraphylum | Gnathostomata Zittel, 1879 - jawed vertebrates |
| superclassis | Osteichthyes Huxley, 1880 - bony fishes |
| class | Actinopterygii Klein, 1885 - ray-finned fishes |
| superorder | Teleostei Müller, 1846 |
| order | Siluriformes Cuvier, 1816 - catfish |
| family | Loricariidae Rafinesque, 1815 - suckermouth armored catfishes |
| genus | Ancistrus Kner, 1854 - Common Bristlenose Catfish |
| species | Ancistrus lithurgicus Eigenmann, 1912 |
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