Larval morphology of Platambus Thomson, 1859: evidence of contrasting morphotypes and phylogenetic considerations (Coleoptera: Dytiscidae, Agabinae)
Bibliographic record
Abstract
All larval instars of Platambus apache Young, 1981 and P. maculatus (Linnaeus, 1758), and the third instar larva of P. semivittatus (LeConte, 1852) are described, illustrated in detail and compared to larvae of other known Platambus Thomson, 1859 species. The descriptions use the now generalized larval descriptive format of aquatic Adephaga, which includes chaetotaxic characters. Based on larval characters, a cladistic analysis is conducted using the program TNT to test the monophyly of Platambus and its relationship with five other agabine genera (Agabus Leach, 1817, Agabinus Crotch, 1873, Hydrotrupes Sharp, 1882, Ilybiosoma Crotch, 1873, Platynectes Régimbart, 1879). The monophyly of Platambus as currently defined is not corroborated in our analysis, as the relationships with some species of Agabus are inconclusive. There is a basal split between Palearctic and Nearctic species of Platambus, whereas all five Palaearctic species studied are recovered as monophyletic with very strong support, the Nearctic P. semivittatus and P. apache are deemed to potentially represent distinct evolutionary lineages as reflected by their contrasting larval morphology.
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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 | 0.000 |
| 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".