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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Xanthonychidae
Taxonomy
Xanthonychidae was named by Strebel and Pfeffer (1880). It is extant.
It was assigned to Helicoidea by Marshall et al. (2025).
It was assigned to Helicoidea by Marshall et al. (2025).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1880 | Xanthonychidae Strebel and Pfeffer |
| 2025 | Xanthonychidae Marshall et al. |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Fm. Xanthonychidae Strebel and Pfeffer 1880
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range
Maximum range based only on fossils: base of the Uintan to the top of the Hemphillian or 45.90000 to 4.70000 Ma
Minimum age of oldest fossil (stem group age): 39.7 Ma
Minimum age of oldest fossil (stem group age): 39.7 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Uintan | USA (California) | Helminthoglypta stocki (16786) | |
| Hemphillian | USA (California) | Helminthoglypta sp. (19447) |