Revision of Platycheirus Lepeletier and Serville (Diptera: Syrphidae) in the Nearctic north of Mexico
Bibliographic record
Abstract
The 75 Nearctic species of Platycheirus Lepeletier and Serville found north of Mexico are revised, including five species new to North America: Platycheirus alpigenus Barkalov and Nielsen, Platycheirus brunnifrons Nielsen, Platycheirus clausseni Nielsen, Platycheirus speighti Doczkal, Stuke & Goeldlin, and Platycheirus splendidus Rotheray. Platycheirus rufimaculatus Vockeroth, Melanostoma willistoni Goot, and Melanostoma concinnus Snow are recognized as junior synonyms of Platycheirus pictipes (Bigot). Melanostoma carinata Curran is recognized as a junior synonym of Platycheirus chilosia (Curran). Melanostoma atra Curran is recognized as a junior synonym of Platycheirus luteipennis (Curran). Platycheirus holarcticus Vockeroth is recognized as a junior synonym of Syrphus naso Walker. Platycheirus trichopus (Thomson) is resurrected and represents what was previously considered the western population of Platycheirus obscurus (Say). One new species, Platycheirus neoperpallidus Young sp. nov., is described. Females of 26 species are described for the first time, and an illustrated key to Nearctic Platycheirus is presented. DNA barcode data are presented for 60 Nearctic species and a COI gene tree of all available world Platycheirus species, as well as morphological and combined morphological/COI phylogenetic analyses of the Platycheirus albimanus species group are presented and discussed.
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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 | 0.001 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| 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".