Integrative taxonomy of two new peltospirid gastropods from Mid-Atlantic Ridge hot vents, including a potentially symbiotic species
Bibliographic record
Abstract
ABSTRACT Deep-sea hydrothermal vents host lush communities of animals relying on bacterial chemosynthetic primary production, where intimate symbioses often form. Peltospiridae are a family of gastropods endemic to hot vents, whose members exhibit a variety of feeding strategies ranging from bacterial grazing to total reliance on endosymbiosis. Here, we report and describe two new peltospirid snails, Peltospira gargantua sp. nov. and Lirapex pantagruel sp. nov., from two recently discovered vent fields on the Mid-Atlantic Ridge. Peltospira gargantua is clearly distinct from other congeners by its much larger size, differences in the number and arrangement of epipodial tentacles, and notably, a hypertrophied oesophageal gland. Lirapex pantagruel is also the largest known species in the genus, differing from other species also by shell shape and sculpture. Phylogenetic reconstructions using the mitochondrial cytochrome c oxidase subunit I (COI) gene agree with their respective generic placements. An expanded oesophageal gland in peltospirids was known only from the endosymbiotic genera Chrysomallon and Gigantopelta, where it is used to host symbionts, indicating that P. gargantua is probably also endosymbiotic. This would represent another case of likely convergently acquired oesophageal endosymbiosis in the family, and the first record of endosymbiotic gastropod from Mid-Atlantic Ridge vents.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".