Dromaeosaurid dinosaurs 'not only lived in the Arctic but thrived there' - BBC Science Focus Magazine
The findings are based on a ‘rare’ piece of dinosaur jawbone thought to a juvenile dromaeosaurid dinosaur.
www.sciencefocus.comHere’s what I can share about the latest developments on Dromaeosaurids based on recent public reports.
Direct answer
- The most recent widely reported discovery within the dromaeosaurid lineage is the description of Dineobellator notohesperus from New Mexico, which was published around 2020. This taxon is notable for being among the latest Cretaceous dromaeosaurids from North America and for providing new insights into predatory behaviors and tail biomechanics within Velociraptorinae.[1][4][5]
Key points about Dineobellator notohesperus
- Discovery and significance: Dineobellator notohesperus is based on a partial skeleton (holotype SMP VP-2430) from the Maastrichtian stage of the Late Cretaceous in New Mexico, representing one of the first diagnostic dromaeosaurids from the southern part of Laramidia near the end of the age of dinosaurs. This finding helped affirm that dromaeosaurids were still diversifying close to the Cretaceous–Paleogene boundary in North America.[4][5][1]
- Anatomical and behavioral implications: The specimen shows features in the forelimbs suggesting greater flexion strength and a tighter grip, along with tail adaptations that imply enhanced agility for predation. These traits contribute to a view of dromaeosaurids as active, niche-specialist predators even late in the Cretaceous.[4]
- Phylogenetic placement: Dineobellator has been placed within Velociraptorinae, contributing to discussions about broader dromaeosaurid diversity and biogeography during the Maastrichtian, including vicariance patterns and potential dispersal events from Asia in earlier times.[1][4]
Additional context on dromaeosaurids (for orientation)
- Dromaeosaurids are a well-known family of feathered, predatory theropods that includes genera like Velociraptor and Dakotaraptor, and they show a wide distribution in Late Cretaceous ecosystems globally. This group is often studied to understand predatory strategies, ecological niches, and their interactions with coexisting giants like Tyrannosaurus rex.[6][1]
- New discoveries continue to refine the timeline of their diversification and geographic spread, with multiple reports from Mongolia, North America, and other regions expanding the known diversity of late-surviving dromaeosaurids.[3][1]
Illustrative example
- Think of Dineobellator as a late-surviving, highly maneuverable raptor-like predator that managed to carve out specific predatory roles even as the ecosystem faced the end-Cretaceous pressures. Its anatomy suggests it relied on swift, precise forelimb movements and agile tail control to capture prey in its environment.[4]
Would you like a concise, side-by-side table of the major late-Cretaceous dromaeosaurid taxa (including Dineobellator) with their key features, locations, and ages? I can compile that and cite sources directly. If you prefer, I can also pull the latest updates beyond 2020–2021 to confirm any new taxa described since then.