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Volutoderma santana
Taxonomy
Volutoderma santana was named by Packard (1922). Its type specimen is UCMP 12294 and is a 3D body fossil. Its type locality is UCMP loc. 2135, Santa Ana Mountains, which is in a Campanian marine horizon in the Williams Formation of California.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1922 | Volutoderma santana Packard p. 432 figs. Plate 36 figure 3 |
| 1958 | Volutoderma santana Anderson p. 175 |
| 1993 | Volutoderma santana Elder and Saul figs. Pl 2, fig 20 |
| 2008 | Volutoderma santana Saul and Squires p. 230 figs. Figure 9 |
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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.
†Volutoderma santana Packard 1922
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. L. Packard 1922 | Shell short, thick, with more than three whorls; pillar oblique, with two strong plaits, probably visible from the aperture of a perfect specimen; sculpture of the early whorls inconspicuously marked by revolving ridges; suture appressed; the slight shoulder below the suture is rnarked by one or two indistinct revolving ridges; last whorl ornamented by ten equidistant spiral ridges, the first six of which are broken up into about twelve rows of axial nodes; the last four ridges are rather sharp and are continuous, whereas those above become almost obsolete between the strong nodes; outer lip thin, very widely expanded; columella apparently without a callus; canal short. Height of body whorl of
the type, 50 mm.; maxirnum width of body whorl, 37 mm, | |
| L. R. Saul and R. L. Squires 2008 | A relatively short-spired almost pyriform Voluto- derma with shouldered whorls and strongly noded sculpture, un- noded cords on ramp wider than interspaces. Anterior canal long, curved to left. Columella with three folds, two visible at aperture. |