Revision and phylogenetic affinities of<i>Elosuchus</i>(Crocodyliformes)
Bibliographic record
Abstract
Elosuchidae is a clade of longirostrine Crocodyliformes currently confined to Barremian through Cenomanian deposits in north-west Africa and Great Britain. The clade is currently composed of Elosuchus cherifiensis (Lavocat, 1955), Elosuchus felixide Lapparent de Broin, 2002, Sarcosuchus imperator Broin & Taquet, 1966, Sarcosuchus hartii Buffetaut & Taquet, 1977, Vectisuchus leptognathus Buffetaut & Hutt, 1980 and, by some authors, Stolokrosuchus lapparenti Larsson & Gado, 2000. We redescribe Elosuchus from assigned and new material. This genus occurs in terrestrial Cenomanian deposits in Morocco and Algeria and known from multiple relatively complete skulls. The holotype is unknown but the assigned lectotype in the Muséum National d'Histoire Naturelle (Paris, France) is composed of a fragmentary ventral braincase. Referred paralectotype material housed in the same museum includes multiple fragmentary specimens and two nearly complete skulls. These and additional material in the Canadian Museum of Nature and Royal Ontario Museum were used to re-examine the genus. The original and new material show a number of autapomorphies among crocodyliforms: a unique contribution of the squamosal and jugal to the postorbital anterolateral process and a highly modified suborbital fenestra that displaces the antorbital cavity anteriorly and forms a bony wall separating the cavity from the orbit. Two diagnosable morphotypes are revealed, one from the Kem Kem beds, Morocco, and the other from Gara Samani, Algeria. We retain Elosuchus cherifiensis for the Kem Kem form and erect a new species Elosuchus broinae sp. nov. for the Algerian form. The revised diagnosis for Elosuchus questions the validity of E. felixi. Elosuchus is incorporated into a phylogenetic analysis that includes extensive revisions to character scores for relevant taxa. The resulting topologies recover Elosuchus sister to Meridiosaurus vallisparidisiMones, 1980, within a complex of ‘Pholidosauridae’ that includes elosuchids and dyrosaurids but excludes Stolokrosuchus. This phylogenetic revision is used to discuss the evolution of this clade and its contribution to crocodyliform diversity during the Cretaceous.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| 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".