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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Sphyrna robustum
Taxonomy
Sphyrna robustum was named by Cicimurri et al. (2025). Its type specimen is SC2013.28.171, a tooth, and it is a 3D body fossil. Its type locality is Jones Branch, which is in a Chattian marine sandstone in the Catahoula Formation of Mississippi.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2025 | Sphyrna robustum Cicimurri et al. p. 41 figs. Fig. 11 |
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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.
†Sphyrna robustum Cicimurri et al. 2025
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. J. Cicimurri et al. 2025 | ”Sphyrna” robustum sp. nov. teeth differ from those of coeval ”Sphryna” gracile sp. nov. (see above) by their greater stoutness, larger overall size, lower cusp height with respect to tooth size, and differing shapes of the mesial cutting edge. These features also serve to distinguish “S.” robustum from the extinct S. integra and S. arambourgi (see Cappetta 1970; Reinecke et al. 2011). Although morphologically similar to “S.” robustum, fossil S. laevissima teeth have a more biconvex cusp and the mesial cutting edge is conspicuously sinuous (Purdy et al. 2001: fig. 60). Of presumed extant descendant species, the teeth of S. mokarran and S. zygaena are comparable to those of “S.” robustum. However, the mesial
cutting edges of the new Oligocene species are less convex and lack serrations. |