Nemegtosaurus mongoliensis

Overview

Nemegtosaurus mongoliensis is a long-necked dinosaur, a sauropod, from Mongolia. Its skull with a long, downward-curving snout first became famous. Revisiting the discovery site decades later expanded the story from head to body.^[1][3]

Key facts

The nearly complete skull is 56 cm long. Its elongated, lightly built outline can be examined in detail. Even one skull can be an important key to studying a giant sauropod.^[1]

Time and place

It lived in the Nemegt Basin of the region now known as the Mongolian Gobi near the end of the Late Cretaceous, around 70 million years ago. The type locality is Central Sayr in the Nemegt area. Fossils found in today’s desert reveal a much older dinosaur ecosystem.^[3][5]

The time range describes source context, not the complete duration of this species.

Size, form and skeleton

The snout extends forward before curving downward, and the skull is lightly built. A 2018 report on a locality revisit also introduced tail vertebrae, a femur, a fibula, and foot material. This created an opportunity to connect comparisons of head and body bones.^[1][3]

Habitat and reproduction

Nemegtosaurus is presented as a plant-eating sauropod. Numerous sauropod bones and tracks remain in the Nemegt area. One skull opens a view onto the broader landscape inhabited by large plant-eating dinosaurs.^[5][3]

Fossil discovery

A Polish–Mongolian expedition discovered the skull in 1965, and a new name was established in 1971. In 2016, researchers revisited the original locality and investigated postcranial bones. A 2018 paper proposed that these bones might belong to the same individual as the type specimen.^[3]

References

1. Nowiński (1971), “Nemegtosaurus mongoliensis n. gen., n. sp. (Sauropoda) from the Uppermost Cretaceous of Mongolia,” Palaeontologia Polonica 25: 57–81.
2. Wilson2005 — Reexamination of the skull of Nemegtosaurus
3. Currie et al.2018 — Rediscovery of Nemegt sauropod localities
4. Osmólska & Roniewicz1970 — Deinocheiridae
5. Natural History Museum — Nemegtosaurus
6. Tsuihiji et al.2011 — Head and growth of a juvenile Tarbosaurus
7. Wilson2005 — Reexamination of the skull of Nemegtosaurus
8. Currie et al.2018 — Rediscovery of Nemegt sauropod localities

Research questions

What was the relationship between skull-known Nemegtosaurus and Opisthocoelicaudia, famous for its postcranial skeleton? The possibility that they were the same species has been discussed. Direct comparisons of the newly found bones may help address this longstanding question.^[3]

Observation

Move your gaze from the long, downward-curving snout to the back of the skull. Considering skull and limb-bone discoveries together reveals a sauropod story connected by old fossils.^[1][3]