N'afọ 1906, ndị American Museum of Natural History expedition nke onye ọkà mmụta ihe ochie bụ Barnum Brown duziri chọpụtara ụdị ụdị Ankylosaurus magniventris (AMNH 5895) na Hell Creek Formation, nso Gilbert Creek, Montana. Ihe nlele ahụ (nke onye nchịkọta Peter Kaisen chọtara) gụnyere akụkụ elu nke okpokoro isi, ezé abụọ, akụkụ nke eriri ubu, cervical, dorsal, na caudal vertebrae, ọgịrịga, na ihe karịrị iri atọ osteoderms. Brown kọwara anụmanụ ahụ na sayensị na 1908; aha genus sitere na okwu Grik αγκυλος / ankulos ('bent' ma ọ bụ 'oked'), na-ezo aka na okwu ahụike bụ ankylosis, isi ike nke ọkpụkpụ na okpokoro isi na ahụ, na σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος / σαυρος /
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