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Stephanozyga nodosa
Taxonomy
Zygopleura nodosa was named by Girty (1915). It is a 3D body fossil. Its type locality is Station 206, above bridge. SW ¼ SW ¼ sec. 9 T. 59, R. 37, which is in a Virgilian carbonate shale/limestone in the Deer Creek Formation of Missouri.
It was recombined as Pseudozygopleura (Stephanozyga) nodosa by Knight (1930); it was recombined as Stephanozyga nodosa by Wagner (2023).
It was recombined as Pseudozygopleura (Stephanozyga) nodosa by Knight (1930); it was recombined as Stephanozyga nodosa by Wagner (2023).
Synonymy list
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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.
†Stephanozyga nodosa Girty 1915
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. H. Girty 1915 | Shell large, turreted, composed of about 7 volutions. A large fragmentary specimen has the final whorl 18 mm. in width and it must have had a length of 45 mm. or more. The volutions are rhombic in outline. The surface above the periphery is somewhat concave, that below the periphery gently convex, the two meeting in an angle somewhat greater than 90 degrees. The periphery is strongly rounded and marked by a row of oblique, elongated nodes or pilae, of which about 17 occur on one of the larger volutions. They end rather abruptly at the peripheral line and die down more gradually above, being traceable about one-third the distance to the suture. Above and below the nodose zone the surface appears to be smooth, the growth lines which were probably present at one time having been lost. The nodes are somewhat elongated and somewhat oblique, the upper end being posterior to the lower. They are separated by grooves of about their own width. It is probably due to this band of prominences that the shell appears concave below the suture. The axial portion of the outer lip is apparently reflexed so as to form a slender columella but the reflexed lip is narrow and bounded by a sulcus. |
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||