Four new basal acanthomorph fishes from the Late Cretaceous of Morocco
Bibliographic record
Abstract
Four new species of acanthomorph fishes are described, and three are named, from the Agoult locality of Morocco, which samples early Late Cretaceous marine deposits of the Akrabou Formation. Of the three new named species, two represent members of the subfamily Aipichthyoidea, based on possession of a caudal fin skeleton with a short, broad, neural spine on the second preural centrum, 19 principal caudal fin rays, and three supraneurals positioned close together in front of the first neural spine. The third named species is placed in the Polymixiiformes based on having a caudal fin with a long, full neural spine on the second preural centrum, and 18 principal caudal fin rays. The fourth species is too poorly preserved to name, but we describe the few details that are visible, and it remains incertae sedis within Acanthomorpha. These new taxa add to the diversity of morphologies seen in both the aipichthyoids and the polymixiiforms during the Cenomanian and Turonian throughout the Tethys Sea.
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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 | 0.003 | 0.001 |
| Science and technology studies | 0.002 | 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) | 0.004 | 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".