Distribution of bone modification traces attributed to tungid fleas on a large late Pleistocene specimen of <i>Glyptodon clavipes,</i> Mar del Plata, Argentina
Bibliographic record
Abstract
The dermal armour that characterizes several vertebrate lineages, such as turtles, lizards, crocodilians and cingulate xenarthrans forms a substrate that can potentially record the interaction between parasites and their hosts in the fossil record. Bone modification traces attributed to tungid fleas have been observed on the osteoderms of several large extinct armadillos. These often occur on disarticulated osteoderms rendering it difficult to identify the distribution of the parasite on the animal. This contribution assesses then distribution of the trace fossil Karethraichnus kulindros on an articulated carapace of the giant chlampyphorid cingulate xenarthran Glyptodon clavipes. Karethraichnus kulindros are not evenly distributed on the carapace analysed. No traces were observed on the upper part of the carapace. Traces in the posterior, pelvic and thoracic regions were sparsely distributed (<0.1/100 cm2). One small patch with ∼ 5 traces/100 cm2 occurred on the lower left pectoral portion of the carapace. The densest accumulation of traces (5–9 traces/100 cm2) occurred in an irregular patch in the anterior region, immediately behind the skull. The parasites, herein interpreted to be tungid fleas related to Tunga perforans, had a clear site preference for parts of the carapace protected from easy access during self-grooming and avoided the widest part of the carapace which would have likely brushed up against vegetation and branches in dense brush.
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".