Bibliographic record
Abstract
Tribe Ancistrini Kner, 1854 Included genera. Ancistrus Kner, 1854:272. Type-species: Hypostomus cirrhosus Valenciennes, 1836 (in Valenciennes, 1834–39). Synonyms: Pristiancistrus Fowler, 1945, Thysanocara Regan, 1906, and Xenocara Regan, 1904. Araichthys Zawadzki et al., 2016:362. Type-species: A. loro Zawadzki, Bifi & Mariotto, 2016. Corymbophanes Eigenmann, 1909:5. Type-species: Corymbophanes andersoni Eigenmann, 1909. Cryptancistrus Fisch-Muller et al., 2018:50. Type-species: C. similis Fisch-Muller, Mol & Covain, 2018. Dekeyseria Rapp Py-Daniel, 1985:178. Type-species: D. amazonica Rapp Py-Daniel, 1985. Synonym: Zonancistrus Isbrücker, 2001 (in Isbrücker et al., 2001). Guyanancistrus Isbrücker, 2001:19 (in Isbrücker et al., 2001). Type-species: Lasiancistrus brevispinis Heitmans, Nijssen & Isbrücker, 1983. Hopliancistrus Isbrücker, Nijssen, 1989:543. Type-species: H. tricornis Isbrücker & Nijssen, 1989. Lasiancistrus Regan, 1904:224. Type-species: Chaetostomus heteracanthus Günther, 1869. See Armbruster, 2005. Neblinichthys Ferraris et al., 1986:70. Type-species: N. pilosus Ferraris, Isbrücker & Nijssen, 1986. Lithoxancistrus Isbrücker et al., 1988:14. Type-species: L. orinoco Isbrücker, Nijssen & Cala, 1988. Paulasquama Armbruster, Taphorn, 2011:46. Type-species: P. callis Armbruster & Taphorn, 2011. Pseudolithoxus Isbrücker, Werner, 2001:21 (in Isbrücker et al., 2001). Type-species: Lasiancistrus tigris Armbruster & Provenzano, 2000. Synonym: Soromonichthys Lujan & Armbruster, 2011. Yaluwak Lujan, Armbruster, 2019 (in Lujan et al., 2019). Type-species: Yaluwak primus Lujan, Armbruster & Werneke (in Lujan et al., 2019). Phylogenetic diagnosis. No characters unite tribe Ancistrini as all character state changes at the node are reversed in a majority of taxa. Character state changes found at the node are hypertrophied odontodes along snout margin (188:1), snout and pectoral-fin odontode sheaths separated from odontode forming short tentacules (208:1, 209:1). Comparative diagnosis. The diversity of forms within Ancistrini results in no characteristics that can readily separate it from all other tribes. Ancistrus, Araichthys, Corymbophanes, Dekeyseria, Lasiancistrus, Neblinichthys, and Pseudolithoxus can be separated from all Hypostomini by having three rows of plates on the caudal peduncle (vs. five, rarely four). Araichthys, Corymbophanes, some Neblinichthys, and Yaluwak can be separated from most other Hypostominae by lacking an iris operculum (the dorsal flap that bifurcates the dorsal part of the eye in most loricariids). Hopliancistrus can be separated from all other Hypostominae by generally having three large, stout, continuously curved evertible cheek odontodes (vs. no hypertrophied cheek odontodes or more or less than three with odontodes generally slender and hooked only distally, not curved throughout). Cryptancistrus, Hopliancistrus, and Lasiancistrus can be separated from all other Hypostominae by having hypertrophied odontodes at anterior corner of snout (see Armbruster, 2005). Guyanancistrus is not readily diagnosable from other Hypostominae, see Fisch-Muller et al. (2018) for review. Geographical distribution. Found in all cis-Andean drainages from the La Plata River basin northward (including Trinidad) and trans-Andean basins from southern Ecuador to just east of the Herrera Peninsula, Panamá.
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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.019 | 0.007 |
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".