Sellosaurus Facts
| Diet | Herbivore |
| Height | 1.5m |
| Length | 4m |
| Weight | 300 kg |
| Speed | 15 km/h |
| Environment | Land |
| Era | Triassic |
| Period | Triassic |
| Type | Sauropod |
| Location | Germany |

| Diet | Herbivore |
| Height | 1.5m |
| Length | 4m |
| Weight | 300 kg |
| Speed | 15 km/h |
| Environment | Land |
| Era | Triassic |
| Period | Triassic |
| Type | Sauropod |
| Location | Germany |
Although originally described as a separate genus, Sellosaurus is now understood to represent juvenile specimens of Plateosaurus gracilis, making it an important part of understanding early sauropod development. This early sauropod lived during the Late Triassic period, between 227 and 201 million years ago, in what is now Germany.
Sellosaurus specimens show the characteristic features of juvenile plateosaurs, with relatively longer limbs compared to body size and less robust bone structure than adult Plateosaurus. These dinosaurs inhabited the warm, semi-arid landscapes of Late Triassic Europe, living alongside other early dinosaurs and various archosaurs in an ecosystem quite different from today's world.
As herbivores, these early sauropods fed on ferns, cycads, and conifers that dominated the Triassic landscape. Their teeth were leaf-shaped and suitable for stripping plant material, though they likely swallowed stones to help grind food in their stomachs. The specimens that were once called Sellosaurus demonstrate how these dinosaurs grew from relatively small juveniles into the larger adults we know as Plateosaurus.
The reclassification of Sellosaurus has helped palaeontologists better understand the growth patterns and development of early sauropods, showing how dramatically these dinosaurs changed as they matured from youngsters into fully-grown adults.
Sellosaurus specimens showed the typical juvenile plateosaur features including proportionally longer legs, a more lightly built skull, and less robust vertebrae compared to adult Plateosaurus. The neck was moderately long and the tail made up about half the total body length.
Based on the juvenile nature of Sellosaurus specimens, these young dinosaurs likely stayed close to adults for protection and may have fed on softer plant materials than their fully-grown relatives. They were probably capable of both bipedal and quadrupedal locomotion, switching between the two as needed.
Sellosaurus was first described by Friedrich von Huene in 1908. The original fossils were discovered at Löwenstein Formation, Baden-Württemberg, Germany.