Eucalathis malgachensis Bitner & Logan 2016, n. sp.
Bibliographic record
Abstract
Eucalathis malgachensis n. sp. (Fig. 11; Table 10) TYPE MATERIAL. — South Madagascar. ATIMO VATAE, stn CP 3614, holotype (MNHN IB-2013-64; Fig. 11 F-I). — Same locality, stn DW 3552, CP 3614, CP 3615, four paratypes (MNHN IB-2013- 66 - 69: Fig. 11 B-E, J-L). TYPE LOCALITY. — South Madagascar, South Cap Sainte Marie, ATIMO VATAE, stn CP 3614, 26°14’S, 45°09’E, 250- 300 m. ETYMOLOGY. — Referring to the Malgache, the French name of the ethnic group that forms nearly the entire population of Madagascar. DIAGNOSIS. — Eucalathis with fascicostate surface, primary ribs strong, triangular in cross-section, 7 to 9 in number, loop angular at the anterior. MATERIAL EXAMINED. — South Madagascar. ATIMO VATAE, stn DW 3515, 1 bivalved specimen. — Stn DW 3522, 7 bivalved specimens. — Stn DW 3523, 13 bivalved specimens. — Stn DW 3524, 37 bivalved specimens. — Stn DW 3528, 6 bivalved specimens.— Stn DW 3534, 5 bivalved specimens. — Stn DW 3552, 54 bivalved specimens, 1 ventral valve, 2 dorsal valves. — Stn DW 3553, 76 bivalved specimens, 4 ventral valves, 4 dorsal valves. — Stn DW 3557, 14 bivalved specimens. — Stn DW 3564, 1 bivalved specimen. — Stn CP 3595, 2 bivalved specimens. — Stn DW 3599, 2 bivalved specimens. — Stn CP 3613, 11 bivalved specimens, 1 ventral valve, 1 dorsal valve. — Stn CP 3614, 4 bivalved specimens. — Stn CP 3615, 64 bivalved specimens, 3 ventral valves, 4 dorsal valves. DEPTH RANGE. — 122- 910 m. MEASUREMENTS. — See Table 10. DESCRIPTION Shell small (maximum length 6.3 mm), strongly biconvex, triangular in outline with greatest width near anterior. Shell surface fascicostate with the dominance of strong, triangular in cross-section, primary ribs 7 to 9 in number; secondary ribs delicate, indistinct. Growth lines distinct. Anterior commissure rectimarginate to incipiently broadly unisulcate. Hinge margin short, straight to slightly curved. Beak suberect to erect with a large, subcircular, mesothyrid foramen; deltidial plates minute, triangular, disjunct. Ventral valve interior with a broad pedicle collar and small, hooked teeth (Fig. 11E). Dorsal valve interior with massive inner socket ridges extending beyond margin. Cardinal process prominent (Fig. 11K, L). Crura stout, crural processes short. Loop thin, angular at anterior, however, in some specimens it can be thickened (Fig. 11M). DIAGNOSIS. — Small Macandrevia with subtriangular outline and large, oval permesothyrid foramen. Loop and cardinalia typical of the genus. DEPTH RANGE. — 132-1195 m. MEASUREMENTS. — See Table 11. REMARKS This species is the most common brachiopod in the studied material (more than 300 specimens), occurring only in South Madagascar. It differs from hitherto described species of Eucalathis in the strong costation of its broad, triangular in cross-section ribs. A similar triangular ribbed shell is observed in Melvicalathis macroctena, however, ribs in the latter species have smooth ridges without tubercles (Lee et al. 2008).
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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 | 0.001 | 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) | 0.008 | 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".