Domatoceras Hyatt, 1891, is one of the easier-to-recognize nautiloid cephalopods in the Glenshaw Formation. If you can see a camera profile, the genus can be identified. Each chamber in the cephalopod shell is elongated toward the venter, with compression between the flanks. The siphuncle hole—where the siphuncle penetrates each chamber wall—is slightly off-center towards the venter. See Figure 2 for Hyatt’s drawing of this feature.
Suture marks on the flank make a broad, sweeping arch pointed towards the anterior end. At each revolution, the shell covers part of the previous whorl.
References
- Kummel, B., 1964, Nautiloidea-Nautilida, p. K383-K466. In R. C. Moore (ed.). Treatise on Invertebrate Paleontology, Part K, Mollusca 3. Geol. Soc. Am. and Univ. Kans. Press, Lawrence.
- Miller, Unklesbay, 1942, The Cephalopod Fauna of the Conemaugh series in Western Pennsylvania, Annals of the Carnegie Museum
- Miller, A.K., Lane, J.H. Jr, Unklesbay, A.G., 1947, A nautiloid cephalopod fauna from the Pennsylvanian Winterset Limestone of Jackson Country, Missouri, The University of Kansas Paleontological Contributions: Article 3 Mollusca 2, Plate 5
- Miller, A.K., Unklesbay, A.G., 1947. The Cephalopod Fauna of the Conemaugh Series in Western Pennsylvania: Supplement, Annals of the Carnegie Museum, v. 30, pp. 319–330
- Sturgeon M.T. et al, 1997, Pennsylvanian Cephalopods of Ohio, Part 1 Nautiloid and Bactritoid Cehphalopods, pp. 26–28, pp. 98–99