Uncommon cretaceous naticiform gastropods from the Pacific slope of North America
Bibliographic record
Abstract
Five naticiform gastropod species, not commonly found in Cretaceous rocks on the Pacific slope of North America, are described, and their paleobiogeographic implications are discussed.The moderately large Tylostoma allisoni, sp.nov. of Early Cretaceous (late Aptian) age from northern Baja California, Mexico, represents the earliest record of this tylostomatid genus in North America.Restudy of the Late Cretaceous (late early to early late Maastrichtian) Phasianella garzana Anderson, 1958, from central California, revealed that it might be a Tylostoma.These two species, along with 7ylostoma?sp.indet. of late Aptian age from northern Baja California, represent all the known occurrences of this genus from the study area.Tylostoma is a cosmopolitan gastropod genus that originated during the Late Jurassic in the Old World Tethys Sea region.The very rare Pictavia santana, sp.nov. of Late Cretaceous (late Turonian) age from southern California represents the first and youngest record of this obscure naticiform genus in the New World.Pictavia originated during the Late Triassic in the Tethys Sea region.The moderately large Prisconatica hesperia, sp.nov. of Late Cretaceous (late Santonian to early Campanian) age, from near Nanaimo, Vancouver Island, British Columbia, and rare in the Santa Ana Mountains, southern California, represents the first record of this obscure naticiform genus on the Pacific slope of North America, as well as its youngest and northernmost record.Prisconatica apparently originated during the Early Cretaceous (Albian) in the New World.22 The Veliger, Vol.47, No. 1 Maceteitemseln Tylostoma?garzana locek2 2) =) Oo 5 o Campanian O lar) Prisconatica hesperia O locs.
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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 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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; both teacher heads agree on what is shown here.
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".