Chaceon alcocki Ghosh and Manning 1993
Bibliographic record
Abstract
Chaceon alcocki Ghosh and Manning, 1993 (Fig. 8) Chaceon alcocki Ghosh and Manning, 1993: 714, figs. 1–3 (type locality: off Travancore coast, 8°37’N 75°37’30”E). — Ng et al., 2008: 147 (list). — Jose et al., 2019: 749, figs. 1–3. Geryon affinis — Alcock, 1899a: 85 [not Geryon affinis Milne Edwards and Bouvier, 1894]. Material examined. 1 male (CL 146.4 mm, CW 161.1 mm) (IO /SS/BRC/00300), off Alleppey (Kerala), Arabian Sea, FORVSS stn. 32121, 9.25°N 76.17°E, 55 m, coll. Dr. Vinu Jacob, HSDT (CV), 13 December 2013. Remarks. Alcock (1899a) erroneously reported a female geryonid (110.5 × 126.5 mm) from off Travancore (Kerala) coast at 410–520 m as Geryon affinis. Ghosh and Manning’s re-examination of this specimen(1993)resulted in the establishment of a new species, Chaceon alcocki, characterized by short frontal and anterolateral spines, the absence of distal spines dorsally on the P2–P5 meri, and laterally compressed pereopod dactyli. Jose et al. (2019) reported another female specimen (146 × 156 mm) collected from a commercial trawl landing along Kerala coast, and was reportedly caught at 260–300 m depth. The present specimen is the first male and the largest specimen reported for this species. The G1 is stout, curved, tapering distally; inner margin is covered with a row of short setae along proximal half, distal quarter with a short spinulose patch terminating sub-distally; outer margin with spinulose patch on distal one-third terminating sub-distally, followed by a small patch of long setae appearing like a spinose projection (Fig. 8J). G2 shorter than G 1 in length,slender, tapering distally, with spinose process subdistally on inner margin (Fig. 8J). Among the closely related congeners, published descriptions of only two species, Chaceon macphersoni Manning and Holthuis, 1988 and Chaceon goreni Galil and Manning, 2001 were supplemented with illustrations of the gonopods. Chaceon alcocki differs from C. macphersoni and C. goreni in the presence of setae on both inner and outer margins (vs. row of setae on inner margin in C. goreni (see Galil and Manning, 2001: fig. 3C–E); absence of setae on either margin in C. macphersoni (see Manning and Holthuis, 1988: fig. 4G, H)). Distribution. Known only from the southeastern Arabian Sea off Kerala at 50–520 m depths (Ghosh and Manning, 1993; Jose et al., 2019; present study).
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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 | 0.000 | 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 | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 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".