Dinosaurs A to Z
Diplodocidae

Seismosaurus SEI-smo-SOR-us

Generic sauropod body-plan outline
You 1.8 m (5.9 ft) tall
Seismosaurus 25 m (82 ft) long
as long as 15 people standing fingertip to fingertip
generic sauropod body plan, scaled to length — not a silhouette of Seismosaurus
Length
25 m (82 ft)
Period
Late Jurassic (157.9–143.1 Mya)
Food
Herbivore
Clade
Diplodocidae Dinosauria Saurischia Sauropodomorpha Sauropoda Whip-tailed sauropods: Diplodocus, Apatosaurus, Brontosaurus.

Seismosaurus is a diplodocidae known from the Jurassic period, of uncertain origin. Most of what’s published comes from a small number of specimens, and the fuller picture of how it lived is still being worked out.

What we know

  • Originally named by Gillette 1991.