A review and redefinition of the subgenus Aphyobranchius Wildekamp, 1977, in the seasonal killifish genus Nothobranchius Peters, 1868 (Teleostei: Nothobranchiidae), from ephemeral wetlands of eastern Tanzania
Bibliographic record
Abstract
Species belonging to the subgenus Aphyobranchius, of the seasonal killifish genus Nothobranchius, are reviewed and the definition of the subgenus is updated. Five species are recognized within this subgenus which, based primarily on morphological and molecular data, form two distinct groups: N. geminus, N. janpapi and N. luekei make up the N. janpapi species group, whereas N. fuscotaeniatus and N. lourensi comprise the N. lourensi species group. All known Aphyobranchius species occur in the central eastern and southern coastal plains region of Tanzania, associated mainly with the Ruvu, Rufiji, Kilombero, Mbezi and Luhule/Luhute river systems, with isolated occurrences in the lowermost reaches of the Wami and Matandu rivers. Features that allow distinction between the five Aphyobranchius species, as well as those that in a broader sense distinguish them from other Nothobranchius species, are documented in detail. Such features primarily comprise differences in elements of colour pattern, morphometric character, phylogenetic relationships, karyotype structure, habitat characteristics and niche preference, breeding behaviour and, to some extent, distribution. We further discuss the taxonomic, biogeographic, ecological and evolutionary aspects of the subgenus. Conservation status of the species range from Least Concern to Critically Endangered, according to IUCN Red List criteria. The main threats to their survival are habitat loss due to expansion of agriculture and urbanisation involving overexploitation of wetlands, and invasive species. Nothobranchius willerti, previously regarded as a member of Aphyobranchius, is here excluded from that subgenus, based on a reassessment of key morphological characters, habitat preference, breeding behaviour and, most importantly, molecular data that indicates a clear affiliation with other species of the subgenus Adiniops.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.006 | 0.005 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".