Sepctracanthicus Isbrucker & Nijssen 1989
Bibliographic record
Abstract
Tribe Spectracanthicini Isbrücker & Nijssen, 1989 Type-genus. Sepctracanthicus Nijssen & Isbrücker, 1987 Included genera. Baryancistrus Rapp Py-Daniel, 1989:245. Type-species: Hypostomus niveatus Castelnau, 1855. See Rapp Py-Daniel et al. (2011). Hemiancistrus Bleeker, 1862:2. Type-species: Ancistrus medians Kner, 1854. See Fisch-Muller et al. (2012) and Armbruster et al. (2015). Parancistrus Bleeker, 1862:2. Type-species: Hypostomus aurantiacus Castelnau, 1855. See Rapp Py-Daniel (1989) and Rapp Py-Daniel, Zuanon (2005). Synonym: Acanthodemus Marschall, 1873. Spectracanthicus Nijssen, Isbrücker, 1987:93. Type-species: Spectracanthicus murinus Nijssen & Isbrücker, 1987. See Rapp Py-Daniel (1989) and Chamon, Rapp Py-Daniel (2014). Phylogenetic diagnosis. Posterior region of hyomandibula deflected mesially causing opercle to sit at almost right angle to main body axis (42:1), opercle not supporting odontodes (79:1), and curved anterolateral processes of basipterygium that meet or nearly meet at midline (167:0). Comparative diagnosis. Spectracanthicini cannot be separated from all other hypostomines as a group. Baryancistrus, ‘ B. ’ beggini, ‘ B. ’ demantoides, Parancistrus, and Spectracanthicus can be separated from all except ‘ Spectracanthicus ’ immaculatus of the Peckoltini by having a fully adnate dorsal fin and a posterior extension of the dorsalfin membrane that reaches either the adipose fin or at least two plates posterior to the insertion of the posteriormost dorsal-fin ray (vs. posterior dorsal-fin membrane maximally extending one plate from the insertion of the posteriormost dorsal-fin ray and never reaching adipose fin); all of these except ‘ B ’. beggini can be separated from ‘ S. ’ immaculatus by having light spots (vs. solid gray or black). Hemiancistrus medians can be separated from all other hypostomines except the Acanthicini by having all odontodes on the head and lateral plates arranged in lines (vs. scattered) and from the Acanthicini by having many very small odontodes in lines (vs. very few, fairly large odontodes) and by having seven dorsal-fin rays (vs. eight to 10). Some Baryancistrus, ‘ B. ’ demantoides, ‘ H. ’ guahiborum, and ‘ H. ’ subviridis can be separated from most other Hypostominae by having a light-colored (white, yellow, or orange) margin to the dorsal fin.
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) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.026 | 0.004 |
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".