Dinosaurs · Small ornithischian

Othnielia

Say it oth-ni-ee-lee-a. The name means ‘[for] Othniel [Marsh]’.

Othnielia beside a person 1.75 m tall. Ticks mark every metre.Body shape drawn for this site, showing the general build of small ornithischians

Length: 1.4 m
Diet: Plant-eater
When: Late Jurassic154 to 142 million years ago
Fossils found in: USA
Named by: Marsh (1877)
Family tree: Dinosauria › Ornithischia › Ornithopoda › Euornithopoda

Where Othnielia sits in the age of dinosaurs.Periods from the ICS chart; dinosaur dates from the Natural History Museum

Small ornithischians. Small early bird-hipped plant-eaters. See all 7

Lived at the same time

Dryosaurus · same country
Gargoyleosaurus · same country
Haplocanthosaurus · same country
Hesperosaurus · same country
Marshosaurus · same country
Saurophaganax · same country
Supersaurus · same country
Barosaurus · same country

Other small ornithischians

Enigmacursor Late Jurassic
Agilisaurus Late Jurassic
Hypsilophodon Early Cretaceous
Heterodontosaurus Early Jurassic
Lycorhinus Late Triassic
Lesothosaurus Early Jurassic

Source: Othnielia in the Natural History Museum Dino Directory, read 12 November 2026. Sizes are the museum's estimates for a typical adult. "Lived at the same time" lists dinosaurs whose dates overlap, which does not always mean they met.