Researchers in Russia have identified a previously unrecognised prehistoric predator after re‑examining fossils stored in a Soviet‑era collection. The specimen, now described as Manipulonyx reshetovi, lived roughly 60–100 million years ago and appears to have specialised in raiding eggs laid by other dinosaurs.
Manipulonyx reshetovi
The material was long held in the collection of the A. Borisyak Paleontological Institute of the Russian Academy of Sciences. Only recently did scientists apply modern methods — comparative morphological analysis, high‑resolution computed tomography and 3D reconstruction — to the bones and reveal features that were missed in earlier examinations.
At around 50 cm in length, Manipulonyx was small by dinosaur standards but carried several adaptations consistent with an egg‑predator. The skull and eye sockets indicate binocular vision and acute hearing, traits that would aid nocturnal foraging. Its forelimbs were shortened in a manner reminiscent of some theropods, yet their proportions and joint orientation are uniquely suited to gripping and piercing eggs.
Detailed study of the hand shows a robust second digit that could be pressed tightly against an egg. Powerful muscles at the shoulder and elbow would have allowed strong compression followed by a rapid extension to withdraw a stuck claw. The shoulder joints were oriented to allow the animal to cup an egg with both forelimbs while long hind limbs provided the speed needed to flee with the prize.
Scientists describe the animal’s behaviour as a form of theft: rather than actively hunting adult prey, Manipulonyx specialised on the calorie‑rich contents of nests. This niche, though unusual, fits within broader records of small predators exploiting dinosaur eggs and nesting sites.
The find demonstrates the value of museum collections assembled in the Soviet period. Specimens that were catalogued decades ago can yield new species when subjected to current technologies. High‑resolution CT scanning and 3D modelling allowed researchers to reconstruct delicate internal structures and musculature attachments that cannot be seen from the exterior of the fossils.
The species description has been published in the Proceedings of the Zoological Institute RAS. The paper not only names Manipulonyx reshetovi but also places it within a growing catalogue of specialised small predators from the Late Cretaceous, expanding understanding of predator‑prey dynamics around nesting sites.
Beyond the scientific detail, the discovery is a timely reminder that re‑examining legacy collections can produce significant breakthroughs. For Russian palaeontology it adds a colourful example of behavioural adaptation and emphasises the international value of well‑preserved museum holdings.
The research team used an interdisciplinary approach that combined classical comparative anatomy with state‑of‑the‑art imaging. Such work can change long‑standing assumptions based on incomplete descriptions and underlines the importance of maintaining and revisiting institutional collections.
Publication of the new species is likely to prompt further searches for related material in other collections and in the field. Each specimen that emerges from archive drawers with new context helps refine the picture of ancient ecosystems and the specialised roles within them.
Image credit: Rossiyskaya Gazeta. Photo: A. Borisyak Paleontological Institute collection
Key Takeaways:
- Researchers at the Borisyak Paleontological Institute re‑examined Soviet‑era fossils using high‑resolution CT and 3D reconstruction.
- The newly described species, Manipulonyx reshetovi, was a small egg‑specialist predator that lived 60–100 million years ago.
- Anatomy shows shortened forelimbs and a specialised hand adapted for grasping and piercing eggs, suggesting a nocturnal egg‑stealing lifestyle.
- The find highlights the value of revisiting museum collections with modern technology and advances understanding of dinosaur nesting interactions.
