Editing Diplodocidae (section)

===Skin===
[[File:Diplodocus sp. fossil dinosaur skin (Morrison Formation, Upper Jurassic; Mother's Day site, Carbon County, Montana, USA) 2.jpg|thumb|left|Skin impression of a diplodocid, specimen CMC VP 10659]]
Few skin impressions of diplodocids have been found. However, at least one significant find was reported by Stephen Czerkas in 1992. Fossils from the Howe Quarry in [[Shell, Wyoming]] preserved portions of the skin from around the tip of the tail, or "whiplash".<ref name="Czerkas1993A"/> Czerkas noted that the skin preserved a sequence of conical spines, and that other, larger spines were found scattered around larger tail vertebrae. The spines appeared to be oriented in a single row along the mid-line of the tail, and Czerkas speculated that this midline row may have continued over the animal's entire back and neck.<ref name="Czerkas1993B"/>

Skin fossils have been discovered at the Mother's Day Quarry that have been assigned to ''Diplodocus'' sp. These skin fossils exhibit a vast amount of scale diversity, the scales of which vary in shape, size, orientation, and 3-dimensional relief depending on their location on the integument. Some of the scale orientations may indicate where the skin originated on the body. For instance, a scale orientation consisting of arching rows of square scales is noted to look similar to scale orientations seen around crocodilian limbs, so it is hypothesized that this area may have come from around a limb in life. Due to the high diversity of scales seen on a relatively small area of skin, the small size of the scales, and the presence of small and juvenile individuals at the Mother's Day Quarry, it is hypothesized that the skin originated from a small or juvenile individual.<ref name="Gallagher2021"/>