Ecology and systematics of a new exceptionally preserved paracrinoid (Echinodermata) from the Neuville Formation of Québec, Canada
Bibliographic record
Abstract
New paracrinoid echinoderm specimens are described from the Late Ordovician, Neuville Formation of Québec, Canada. These new specimens share key features with the unusually preserved and poorly known Amygdalocystites? gorgo. Based on the new specimens, this taxon is distinctive from Amygdalocystites and requires establishing a new and separate genus. Quebecocystites gorgo new genus, is exceptionally preserved displaying fine details of the feeding structures, stalk, and holdfast, which are rarely preserved within paracrinoids. This new taxon has a combination of characteristics including an amygdaloidal body with two long ambulacra, a theca composed of numerous, unorganized, and unornamented plates lacking respiratory structures, thin and reduced floor plates, and long thin brachioles. The inclusion of this new taxon into a previously published phylogenetic analysis indicates a close relationship with the Platycystitidae and suggests that respiratory structures evolved independently four times within paracrinoids. Finally, the exceptional preservation of Q. gorgo provides new insights into the paleoecology of paracrinoids including direct comparisons with other suspension feeding echinoderms allowing for the assessment of potential competition, regeneration of brachioles, and galls and pits suggesting parasitism.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.005 | 0.011 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.010 | 0.003 |
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".