| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Ceratopea keithi
Taxonomy
Ceratopea keithi was named by Ulrich (1911). Its type specimen is USNM 56632, an other (operculum), and it is a 3D body fossil. Its type locality is Wytheville, which is in a Cassinian marine horizon in the Beekmantown Formation of Virginia.
Sister species lacking formal opinion data
Synonymy list
Is something missing? Join the Paleobiology Database and enter the data
|
|
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.
†Ceratopea keithi Ulrich 1911
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1941 | A dextral gastropod represented only by rather large, solid, tooth-shaped opercula with a relatively shallow depression at the attached end; the opercula when viewed from the apex are sinistrally bent and are rather sharply subangular or carínate on the outer edge, the angulation or carina probably correspondingwith a similar angulation on the shell. Assuming that the growth lines on the operculum correspond in reverse with the margin of the aperture of the shell, the margin of the outer lip of the shell must have had a rather strong sinus, the margin of the upper surface of the whorl must have left the upper suture with slight backward obliquity slightly convex forward increasing somewhat as the periphery is approached, below the periphery passing downward with rather strong forward obliquity which becomes even more marked on the base just before turning roundly to a slight backward obliquity at the umbilical shoulder, within the umbilicus turning backward with moderately strong obliquity and forward convexity. The holotype measures about 30 mm. in length, about 17 mm. in greatest thickness (from counterpart of umbilical shoulder to counterpart of sinuate carina), and about 22 mm. in least thickness (from counterpart of upper whorl face near upper suture to counterpart of base). |