<i>Eotheroides lambondrano</i> , new middle Eocene seacow (Mammalia, Sirenia) from the Mahajanga Basin, northwestern Madagascar
Bibliographic record
Abstract
The first diagnostic sirenian material from Madagascar and, more broadly, the first diagnostic pre-Pleistocene Cenozoic mammal material recovered from the island is reported. Eotheroides lambondrano is a new species of sirenian collected from middle Eocene nearshore marine deposits in the Mahajanga Basin of northwestern Madagascar. The recovered material consists of a nearly complete adult skull (including the first complete rostrum known for Eotheroides) and several portions of pachyosteosclerotic ribs. Diagnostic features of E. lambondrano include: primitive upper dental formula of 3.1.5.3, relatively large occlusal area of M2 and M3, long and narrow nasals, weak rostral deflection compared to other Eocene Dugongidae, well developed supraorbital processes, short infraorbital canal, anteroposteriorly short zygomatic-orbital bridge of maxilla, and a palate that is narrow anteriorly, creating a strongly bell-shaped maxillary dental arcade. The cranium of E. lambondrano is similar to that of E. aegyptiacum from the middle Eocene of Egypt in aspects of both morphology and size but the upper molars of E. lambondrano are considerably longer and wider and it has longer, narrower nasals. The age and relatively primitive morphology of E. lambondrano suggests that it may represent the ancestral form from which more northerly species were derived.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".