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Pseudozygopleura scitula
Taxonomy
Loxonema scitula was named by Meek and Worthen (1860). It is not a trace fossil.
It was corrected as Loxonema scitulum by Mark (1912); it was recombined as Pseudozygopleura (Pseudozygopleura) scitula by Knight (1930), Hoare and Sturgeon (1985) and Kues and Batten (2001); it was recombined as Pseudozygopleura scitula by Hoare (1961), Yochelson and Saunders (1967), Schindel et al. (1982), Kulas and Batten (1997) and Wagner (2023).
It was corrected as Loxonema scitulum by Mark (1912); it was recombined as Pseudozygopleura (Pseudozygopleura) scitula by Knight (1930), Hoare and Sturgeon (1985) and Kues and Batten (2001); it was recombined as Pseudozygopleura scitula by Hoare (1961), Yochelson and Saunders (1967), Schindel et al. (1982), Kulas and Batten (1997) and Wagner (2023).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1860 | Loxonema rugosa Meek and Worthen |
| 1860 | Loxonema scitula Meek and Worthen |
| 1860 | Loxonema rugosa Meek and Worthen p. 465 |
| 1866 | Loxonema scitula Meek and Worthen p. 377 figs. pl. 31 f. 10a-c |
| 1866 | Loxonema rugosa Meek and Worthen p. 378 figs. pl. 31 f. 11a-c |
| 1912 | Loxonema scitulum Mark p. 312 figs. pl. 16 f. 2 |
| 1915 | Zygopleura affinis Girty |
| 1915 | Zygopleura rugosa Girty p. 183 figs. pl. 25 f. 1-1a |
| 1915 | Zygopleura affinis Girty p. 359 figs. pl. 32 f. 6a-b |
| 1930 | Pseudozygopleura (Pseudozygopleura) scitula Knight p. 33–35 figs. pl. 1 f. 2a-c |
| 1961 | Pseudozygopleura scitula Hoare p. 168 figs. pl. 21 f. 11 |
| 1967 | Pseudozygopleura scitula Yochelson and Saunders p. 157 |
| 1982 | Pseudozygopleura scitula Schindel et al. p. 734 figs. pl. 1 f. 1-4 |
| 1985 | Pseudozygopleura (Pseudozygopleura) scitula Hoare and Sturgeon p. 75 figs. f. 1e, 4h-j |
| 1997 | Pseudozygopleura scitula Kulas and Batten p. 52 |
| 2001 | Pseudozygopleura (Pseudozygopleura) scitula Kues and Batten pp. 70 - 71 figs. 13.19-13.23 |
| 2023 | Pseudozygopleura scitula Wagner p. 5334 |
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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 scitula Meek and Worthen 1860
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Invalid names: Loxonema rugosa Meek and Worthen 1860 [synonym], Pseudozygopleura (Pseudozygopleura) affinis Girty 1915 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. S. Kues and R. L. Batten 2001 | Shell large (up to 30 mm high), narrowly conical, high spired (heightlwidth = 3.0+), anomphalous, consisting of at least 13 whorls; spiral angle averaging 25 degrees; early whorls (3-7) gently convex to nearly flat in profile; later whorls becoming more convex and gently pendant, with periphery low on whorl; whorls embracing low on previous whorl; sutures shallow, adpressed; whorl height about one half width; aperture suboval, higher than wide; columellar lip straight, thickened, somewhat flattened; base of body whorl gently convex, unornamented; collabral costae strong, sharp-crested, typically straight and orthocline to gently opisthocline on earlier whorls, becoming moderately arcuate on later whorls, numbering about 20 per whorl with little change in growth; protoconch consisting of three or more whorls of which all but the first have fine, sinuous axial threads. |