 The next species of Stegosaurus to be named was S. marshi , by Frederick Lucas in 1901 . Lucas reclassified this species in the new genus Hoplitosaurus later that year . Lucas also re @-@ examined the issue of the life appearance of Stegosaurus , coming to the conclusion that the plates were arranged in pairs in two rows along the back , arranged above the bases of the ribs . Lucas commissioned Charles R. Knight to produce a life restoration of S. ungulatus based on his new interpretation . However , the following year , Lucas wrote that he now believed the plates were probably attached in staggered rows . In 1910 , Richard Swann Lull wrote that the alternating pattern seen in S. stenops was probably due to shifting of the skeleton after death . He led the construction of the first ever Stegosaurus skeletal mount at the Peabody Museum of Natural History , which was depicted with paired plates . In 1914 , Charles Gilmore argued against Lull 's interpretation , noting that several specimens of S. stenops , including the now @-@ completely prepared holotype , preserved the plates in alternating rows near the peak of the back , and that there was no evidence of the plates having shifted relative to the body during fossilization . Gilmore and Lucas ' interpretation became the generally accepted standard , and Lull 's mount at the Peabody Museum was changed to reflect this in 1924 . 
