A 50-year conundrum is conclusively solved: nudibranchs <i>Dendronotus albus</i> (= <i>D. diversicolor</i>) and <i>Dendronotus robilliardi</i> are valid species with compelling evidence from type materials, bibliographic sources, and molecular data
Bibliographic record
Abstract
A persistent confusion in the identification of two similar species of nudibranch molluscs of the genus Dendronotus Alder and Hancock, 1845, which inhabit shallow Canadian, Russian, and US waters of the northern Pacific Ocean, has caused a considerable taxonomic conundrum for over 50 years. In this study, we present compelling evidence for the first time, including morphological and molecular data as well as a study of type materials, to definitively conclude that Dendronotus albus MacFarland, 1966 was misidentified in the publication of G.A. Robilliard (1970; Veliger, 12: 433–479). This caused the long-term incorrect application of the characters of the real D. albus sensu F.M. MacFarland (1966; Mem. Calif. Acad. Sci. 6: 1–546) (which is still circulated in the literature) to a completely different, though externally similar, species incorrectly named “D. albus” in G.A. Robilliard (1970; Veliger, 12: 433–479). This species was properly described only 3 years ago as Dendronotus robilliardi Korshunova, Sanamyan, Zimina, Fletcher and Martynov, 2016. Using multiple evidence in this study, we firmly conclude that D. robilliardi is a well-supported valid species, whereas “Dendronotus diversicolor” Robilliard, 1970 is a junior synonym of D. albus. We also present rare bibliographic materials that shed light on the source of the misidentification of these species and also confirm the designation of the lectotype for D. albus. Biogeographical data, which are important for conservation and ecological studies, are also presented for D. albus and D. robilliardi in the Canadian and American Pacific Ocean.
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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 | 0.033 | 0.060 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.009 | 0.021 |
| Scholarly communication | 0.007 | 0.029 |
| Open science | 0.004 | 0.008 |
| Research integrity | 0.011 | 0.018 |
| Insufficient payload (model declined to judge) | 0.006 | 0.006 |
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".