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Levizygopleura williamsi
Taxonomy
Pseudozygopleura (Pseudozygopleura) williamsi was named by Knight (1930) [Pseudozygopleura (Pseudozygopleura) williamsi Knight 1930]. 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. It is the type species of Levizygopleura.
It was recombined as Pseudozygopleura williamsi by Yochelson and Saunders (1967), Kulas and Batten (1997); it was recombined as Microptychis williamsi by Hoare and Sturgeon (1981), Kues and Batten (2001); it was recombined as Levizygopleura williamsi by Bandel (2002), Wagner (2023).
It was recombined as Pseudozygopleura williamsi by Yochelson and Saunders (1967), Kulas and Batten (1997); it was recombined as Microptychis williamsi by Hoare and Sturgeon (1981), Kues and Batten (2001); it was recombined as Levizygopleura williamsi by Bandel (2002), Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1930 | Pseudozygopleura (Pseudozygopleura) williamsi Knight p. 36 figs. pl. 1 f. 5a-c |
| 1967 | Pseudozygopleura williamsi Yochelson and Saunders p. 159 |
| 1981 | Microptychis williamsi Hoare and Sturgeon pp. 187 - 189 figs. pl. 1 f. 3-6; txt.f. 1B-C; table 1 |
| 1995 | Pseudozygopleura (Pseudozygopleura) williamsi Batten p. 30 figs. 41a-b |
| 1997 | Pseudozygopleura williamsi Kulas and Batten p. 54 |
| 2001 | Microptychis williamsi Kues and Batten p. 80 figs. f. 15.14-15.15 |
| 2002 | Levizygopleura williamsi Bandel p. 124 |
| 2023 | Levizygopleura williamsi Wagner p. S5398 |
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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.
†Levizygopleura williamsi Knight 1930
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Batten 1995 | Elongate, conical, high-spired shells without adult ornament other than growth lines. Protoconch heterostrophic at about 90˚ from adult axis. Three postembryonic whorls have arcuate collabral costae with indication at midwhorl of spiral element. Adult whorl profile is slightly inflated with broad periphery low on whorl. Whorls embrace just below periphery on basal margin. Growth lines slightly arcuate. Anomphalus. Base evenly rounded. |