Male terminalia of Diptera (Insecta): a review of evolutionary trends, homology and phylogenetic implications
Bibliographic record
Abstract
The male terminalia character system in Diptera is reviewed. The phylogenetic implications of apomorphic changes are traced on published cladograms. New synapomorphies include: anteroventral parameral apodeme for the Tipulomorpha; parameral sheath encompassing desclerotized aedeagus for Neodiptera (exclusive of Axymyiidae); endoaedeagus for Xylophagomorpha + Tabanomorpha. Apystomyiidae are classified as the sister group to the Eremoneura based on four synapomorphies (lateral ejaculatory processes absent, subepandrial sclerite extending from base of hypoproct to phallus, bacilliform sclerites extending to tips of the epandrium and surstyli functionally developed, but not articulated) and lack of eremoneuran synapomorphies (i.e., loss of gonostyli, presence of postgonites and phallic plate). The Diptera sperm pump with a functional ejaculatory apodeme is a possible autapomorphy of Diptera, exclusive of Nymphomyiidae and Deuterophlebiidae. Internal details of the male terminalia ofSylvicolaandMycetobia(Anisopodidae),Hilarimorpha(Hilarimorphidae) andApystomyia(Apystomyiidae) are newly illustrated and homologies of the aedeagus, paramere and sperm pump of the Tipuloidea are clarified.
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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.002 |
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".