Physonemus altonensis

St. John & Worthen, 1875

Classification: Holocephali Symmoriiformes Symmoriidae

Reference of the original description

St.John, O.H. & Worthen, A.H. (1875)
Palaeontolgoy of Illinois. Descriptions of fossil fishes. Geological Survey of Illinois, 6, 245–488

Types
Physonemus altonensis

Description:

Citation: Physonemus altonensis St. John & Worthen, 1875: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 10/2026

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Remarks
shark-references Species-ID=15119;
type species of Stethacanthus Newberry, 1889 [4683] by original designation (Art. 68.2 ICZN);

References

St.John, O.H. & Worthen, A.H. (1875)
Palaeontolgoy of Illinois. Descriptions of fossil fishes. Geological Survey of Illinois, 6, 245–488