| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Syacium
Taxonomy
Syacium was named by Ranzani (1842). It is extant.
It was assigned to Cyclopsettidae by Cicimurri et al. (2025).
It was assigned to Cyclopsettidae by Cicimurri et al. (2025).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1842 | Syacium Ranzani |
| 2025 | Syacium Cicimurri et al. p. 84 |
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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.
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009 | |||||
Age range
Maximum range based only on fossils: base of the Chattian to the top of the Holocene or 27.30000 to 0.00000 Ma
Minimum age of oldest fossil (stem group age): 23.04 Ma
Minimum age of oldest fossil (stem group age): 23.04 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chattian | USA (Mississippi) | S. sp. (133111) | |
| Tortonian | Panama | S. sp. (145520) | |
| Messinian | Algeria (Oran) | S. oranensis (59256) | |
| Early/Lower Pliocene | Ecuador (Esmeraldas) | S. ovale (135043) | |
| Late/Upper Pleistocene - Holocene | USA (Louisiana) | S. guntheri (161932) |