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Pseudozygopleura (Pseudozygopleura) nigra
Taxonomy
Pseudozygopleura (Pseudozygopleura) nigra was named by Knight (1930). Its type specimen is YPM 12972, a shell, and it is not a trace fossil. Its type locality is SL-1. Headwaters of Feefee Creek, north of Olive St. & west of Lindberg Blvd., 1.5 km northwest of Stratmann (Olivette), which is in a Moscovian offshore shale in the Appanoose Formation of Missouri.
Synonymy list
| Year | Name and author |
|---|---|
| 1930 | Pseudozygopleura (Pseudozygopleura) nigra Knight p. 48–49 figs. pl. 2 f. 14a-b |
| 1997 | Pseudozygopleura (Pseudozygopleura) nigra Kulas and Batten p. 54 |
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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.
†Pseudozygopleura (Pseudozygopleura) nigra Knight 1930
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1930 | High-spired; sides very slightly convex at neanic stages and straight at ephebic; whorl profile gently arched, very slightly pendant; sutures only moderately deep; whorls about half as high as wide; aperture auriform, base rounded.
None of the four specimens referred here show the slightest trace of costae, and are entirely without ornamentation other than fine and sporadic lines of growth. The holotype is almost black in color and the color has a translucent appearance that suggests that it is original. Among the smooth forms with which P. nigra might be confused, P. semicostata is perhaps the closest. Yet P. nigra can be readily enough distinguished by its relatively deeper sutures, its typically less pendant whorl profile, by its less attenuated form, and by its fewer whorls and smaller size. A crowding of the growth lines near the aperture suggests that the latter criteria do not in this instance reflect immaturity. |
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||