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beaked plant-eater
Hesperonyx
Say it like this: “hes-PERR-ON-iks”
Hesperonyx martinhotomasorum
Hesperonyx ate plants and walked on two legs. It lived in the Late Jurassic. Bones have been found in Portugal.
- When
- Late Jurassic (Kimmeridgian) · roughly 154.8 to 149.2 million years ago
- Named in
- 2023 · Rotatori, F. M.; Ferrari, L.; Sequero, C.; Camilo, B.; Mateus, O.; Moreno-Azanza, M.
- Hip height
- Not established
- Length
- 3–4 m · 10–13 ft
- Weight
- Not established
- Found in
- Portugal · Lourinhã
- Food and walking
- Herbivore · Two legs
- Kind
- beaked plant-eater · Ornithopod
- Family branch
- Dryosauridae
The story in short
In 2023, F. M. Rotatori and colleagues published the name Hesperonyx.
It lived in the Late Jurassic (Kimmeridgian), roughly 154.8 to 149.2 million years ago. Finds come from Portugal, including the Lourinhã Formation. It was a herbivore and walked on two legs.
Published estimates put Hesperonyx at a length near 3–4 m.
On the family tree it sits in Dryosauridae, among the ornithopod dinosaurs.
Close relatives
Callovosaurus
Callovosaurus leedsi
Middle Jurassic (Callovian) · roughly 165.3 to 161.5 million years ago
Dryosaurus
Dryosaurus altus
Late Jurassic (Kimmeridgian · Tithonian) · roughly 154.8 to 143.1 million years ago
Dysalotosaurus
Dysalotosaurus lettowvorbecki
Late Jurassic (Kimmeridgian) · roughly 154.8 to 149.2 million years ago