Carapace and mandibles ontogeny in the Dendrobranchiata (Decapoda), Euphausiacea, and Mysidacea (Crustacea): a phylogenetic interest
Bibliographic record
Abstract
The ontogeny of the carapace and the mandibles has been studied for one species of Dendrobranchiata (Decapoda), four species of Euphausiacea, and three species of Mysidacea (one species of Lophogastrida and two species of Mysida). The protocephalic origin of the carapace, which arises from the antennar tergite, is confirmed. During larval development the progressive dorsal insertion of the carapace leads to the opening of the tergites of both cephalic and thoracic segments. The opening of the eight thoracic segments (TS) occurs in Euphausiacea and Decapoda only, and is done in three steps (TS1; TS1TS3 or TS1TS4; TS1TS8). In adult Mysidacea, the insertion of the carapace exhibits two levels of evolution (opening of TS1 in Gnathophausia species and of TS1TS4 in the others). Thus, in the larvae of Euphausiacea and Decapoda, the most evolved taxa, the progressive insertion of the carapace corresponds to the carapace locations in the adults of the most ancient taxa, i.e., Mysidacea. The location of the internal musculature of the mandibles, which is known for certain to characterize the different parts of the arthropodial segment, and their development, shows that the gnathal part of each mandible is prolonged by a pleural part and half the residual tergite of the mandibular segment.
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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".