New occurrences of crabs (Decapoda, Brachyura, Eubrachyura) in the Pliocene of Florida (United States)
Bibliographic record
Abstract
Despite the rich fossil record of decapod crustaceans in Florida, there are still several stratigraphic intervals for which almost no fossil decapods have been reported. Here we document the occurrence of two species of eubrachyuran crabs from the Pliocene Pinecrest Member of the Tamiami Formation, Sarasota County, based on complete and well preserved dorsal carapaces: the leucosiid Persephona cf. P. subovata (Rathbun, 1893), and the xanthid Paractaea cf. P. nodosa (Stimpson, 1860). The specimen of Paractaea cf. P. nodosa represents the second fossil record of the genus and the oldest occurrence known to date. The specimen of Persephona cf. P. subovata, despite its geographic occurrence, it is more similar anatomically to some extant tropical Eastern Pacific species than to any of the species occurring in Florida today. It is possible that ancestral populations of P. subovata were present in the tropical Eastern Pacific and western Atlantic before the water masses were isolated after the final closure of the currents connecting both water masses, and that the fossil Persephona here studied is part of a relict population of P. subovata that disappeared in the Atlantic after the late Pliocene.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.000 |
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 teacher head, 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".