Trauma in the life of a Nebuloxyla, an Early Devonian basal euphyllophyte
Bibliographic record
Abstract
Anatomically preserved material from Lower Devonian strata of the Battery Point Formation (Gaspé Peninsula, Quebec, Canada) offers a rare opportunity to reconstruct the sequence of events in the life of a Nebuloxyla mikmaqiana plant (early euphyllophyte) that led to wounding and the plant’s recovery after wounding. Using serial sections from cellulose acetate peels of the Nebuloxyla axis and volume renderings of the affected tissues, we show that the wound, centered around a branch and caused likely by an herbivore, resulted in removal of the extraxylary tissues of the branch starting from its very base, associated with bending of the xylem strand that supplied the branch. Downward bending of the branch xylem toward the base of the main axis led to the separation and displacement of a significant portion of it, leaving a short portion of the xylem strand at the base of the branch in its original position. The displaced strand of branch xylem, after stripping of the extraxylary tissues along with some of its own thickness, was left protruding outwards from the open wound surface. Subsequent development of wound response tissue filled the gap left by the wound around the protruding displaced xylem strand, surrounding it with wound periderm. This specimen provides evidence that plants as old as Nebuloxyla had the capacity to endure and survive traumatic events, and to deploy effective and sophisticated response mechanisms that had already evolved in the euphyllophyte clade by Emsian time. More broadly, this occurrence re-emphasizes the importance of permineralized fossils in documenting details of plant anatomy and development, even allowing glimpses into minutia of their daily life, such as interactions with their environment and immediate responses to these interactions.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".