Laganosuchus maghrebensis Sereno & Larsson 2009, sp. n.
Bibliographic record
Abstract
Laganosuchus maghrebensis sp. n. urn:lsid:zoobank.org:act: E5BCEEAD-DFEF-4EF6-AA62-110EF91FCD0F Fig. 42 Table 14 Etymology. Maghreb, western (Arabic); - ensis (Latin), from. Named for the area where the holotype was discovered in the Kem Kem Beds of southeastern Morocco. Holotype. UCRC PV2; anterior portion of the left dentary preserving four alveoli and one replacement tooth in the anteriormost tooth position (Fig. 42). Referred material. CMN 50838, anterior left dentary fragment preserving the symphyseal end and alveoli 1–3. Type locality. Er Rachidia District, Morocco (exact locality unknown). The referred specimen (CMN 50838) probably was found south of Erfoud (Fig. 1A, B). Horizon. Kem Kem Beds, upper member; Upper Cretaceous (Cenomanian), ca. 95 Mya (Sereno et al. 1996). Diagnosis. Metasuchian with a narrow, well defined groove on the ventral aspect of the anterior dentary immediately lateral to the splenial that arcs to the posterior aspect of the symphysis; shallow, anteriorly tapering trough on the anterior dentary just lateral to the more sharply defined groove. Dentary. The anterior portion of the dentary is preserved in two specimens of Laganosuchus maghrebensis. Th e very rugose dentary symphysis suggests that it may have fused with maturity, and that its size, which is somewhat smaller than Laganosuchus thaumastos, may not be significant. The more complete specimen (Fig. 42 A-D) shows a remarkable similarity to Laganosuchus thaumastos. Both have slender U-shaped lower jaws with the symphysis restricted to the dentary, festooned alveoli with enlarged first and second teeth, and a sharply incised Meckel’s canal developed as a narrow groove. Th e teeth are also spikeshaped without recurvature or marginal ornamentation. Several differences, however, establish L. maghrebensis as a distinct species. The dentary is narrower near the symphysis (Fig. 42C), lacking the internal crest that thickens the dentary in L. thaumastos (Fig. 38B). Th e anterior alveoli in L. maghrebensis are not procumbent or exposed in lateral view as in L. thaumastos. Likewise, an articular scar for the splenial in L. maghrebensis shows that its anterior end tapers to a narrow tip along the ventral margin (Fig. 42B) in contrast to the bifurcated flanges in L. thaumas- tos (Fig. 38B). Th e incised groove representing Meckel’s canal is located on the ventral, rather than lingual, aspect of the dentary (Fig. 42D). Table |4. Dimensions (mm) of the anterior end of the right dentary of Laganosuchus maghrebensis (UCRC PV2). Although crown size in the two species is very similar, the alveolus of the caniniform tooth (d4) is slightly larger than comparable measurements for d1 (Table 14), the reverse of the condition in Laganosuchus thaumastos (Table 13). L. maghrebensis, in addition, shows low fluting on the lingual aspect of the crown of the first dentary tooth (Fig. 42E). A comparable crown, however is not available at the anterior end of the dentary series in L. thaumastos.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.015 | 0.002 |
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".