<p><strong>A newly discovered enantiornithine foot preserved in mid-Cretaceous Burmese amber</strong></p>
Why this work is in the frame
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Bibliographic record
Abstract
Recent discoveries of enantiornithine remains in Burmese amber have provided a wealth of paleobiological data on this extinct clade of Mesozoic birds. Amber, as a unique medium of fossilization, preserves in three dimensions structures with details unmatched elsewhere in the fossil record. This provides the opportunity to combine osteological information with more detailed information on integumentary structures, including soft tissues and the plumage of the specimens. Herein, we describe an isolated bird foot, DIP-V-19354, consisting of complete metatarsals and digits, including the claws. Placement among the Enantiornithes is supported by the presence of a metatarsal IV with a trochlea formed by a single condyle and the large size and curvature of the claws. The bones of the right foot are preserved fully encased in soft tissue. Scutellae scale filaments (SSFs) are present along the metatarsals and digits, and are similar to those previously described in other enantiornithines. The distribution and relative size of the SSFs on the longest digit support the hypothesis of a mechanosensory tactile role of these structures: this may implicate the digit in the feeding strategy of the animal, as has been suggested for Elektorornis. Unlike many of the previously described enantiornithine remains from this deposit, the taphonomic history of DIP-V-19354 suggests that the foot was trapped in resin flows above the forest floor, likely on the trunk of a tree, after the bird had died.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it