A Systematic Revision of Kroyeria (Copepoda: Siphonostomatoida): Five New Species, 11 Redescriptions, and a Morphological Phylogenetic Analysis of the Genus
Bibliographic record
Abstract
This study focuses on the taxonomy and systematics of Kroyeria, a genus of ectoparasitic copepods found on the gills of sharks. Members of the genus Kroyeria exhibit species-specific appendage ornamentation, including denticles, membranes, and setules, in addition to the setae and spines typical of most copepods. The taxonomy and systematics of Kroyeria have been hampered by the lack of observation of these fine morphological details. This study is a systematic revision of the genus in which 11 species of Kroyeria are redescribed, 6 species are synonymized, and 5 new species are described: Kroyeria branchiocetes n. sp. from Carcharhinus amblyrhynchos from the Red Sea, Kroyeria cresseyi n. sp. from Triakis semifasciata from off California, Kroyeria decepta n. sp. from Carcharhinus obscurus from the Pacific Ocean off Mexico, Kroyeria procerobscena n. sp. from Carcharhinus leucas from off Madagascar, and Kroyeria rhophemophaga n. sp. from Galeorhinus galeus from off California. With this work, Kroyeria now comprises 20 valid species. The 16 species of Kroyeria that were examined in this study were scored for 44 morphological characters, which were used for a phylogenetic analysis of the genus.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.000 | 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".