A new species of Megalonychidae (Mammalia, Xenarthra) from the Quaternary of Poço Azul (Bahia, Brazil)
Why this work is in the frame
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Bibliographic record
Abstract
The new genus and species Ahytherium aureum (Mammalia, Xenarthra, Megalonychidae) from the Quaternary of Poço Azul (Bahia, Brazil) is described. It is the first Brazilian megalonychid known from reasonably complete and well-preserved remains. Purported Brazilian megalonychids described in the past, such as Ocnopus gracilis and Xenocnus cearesis, are noted as belonging to other sloth clades, and the acceptance by past paleontologists of the existence of ‘strange’ megalonychids in Brazil is shown to be erroneous. Ahytherium aureum, in fact, exhibits typical megalonychid morphology. It differs from other known members of Megalonychidae in several characters, including a markedly shortened, but high rostral region, with dorsally inflated frontals, wide zygomatic processes of the frontal, narrow, blade-like and anterolaterally oriented lacrimals, curved, slender and oval caniniforms, gracile humerus with less developed deltopectoral shelf, and relatively distal position of the greater trochanter of the femur. A second specimen from São Paolo state is tentatively assigned to the new genus and species. Un nouveau genre et une nouvelle espèce, Ahytherium aureum (Mammalia, Xenarthra, Megalonychidae), provenant des niveaux quaternaires de Poço Azul (État de Bahia, Brésil), sont décrits. Il s’agit du premier mégalonychidé brésilien représenté par un matériel relativement abondant et bien conservé. Les mégalonychidés antérieurement décrits, tels qu’Ocnopus gracilis et Xenocnus cearesis, appartiennent à d’autres clades. L’acceptation dans le passé de l’existence d’étranges mégalonychidés au Brésil est erronée. Ahytherium aureum présente en réalité une morphologie typiquement mégalonychide. Il diffère des autres membres du clade Megalonychidae par plusieurs caractères, dont une région rostrale nettement raccourcie et élevée, des frontaux bombés, un frontal présentant de larges processus zygomatiques, des lacrymaux étroits, en forme de lames et dirigés antérolatéralement, des caniniformes courbes, minces et ovales, un humérus gracile montrant un plateau deltopectoral peu développé et une position relativement distale du grand trochanter du fémur. Un second spécimen provenant de l’État de São Paulo est présentement assigné à ce nouveau genre et à cette nouvelle espèce.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 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 it