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Spiroscala pagoda
Taxonomy
Spiroscala pagoda was named by Knight (1945). Its type specimen is Plummer Coll. P-4341, a shell, and it is a 3D body fossil. Its type locality is Loc. 181-T-43 (Q-5) ¼ to ½ mile west and north of Union Hill School, which is in a Missourian marine shale in the Mineral Wells Formation of Texas. It is the type species of Spiroscala.
Synonymy list
| Year | Name and author |
|---|---|
| 1945 | Spiroscala pagoda Knight p. 575 figs. pl. 79 f. 5a-b |
| 1997 | Spiroscala pagoda Hoare et al. p. 1030 |
| 2001 | Spiroscala pagoda Kues and Batten p. 26 |
| 2023 | Spiroscala pagoda Wagner p. 2069 |
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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.
†Spiroscala pagoda Knight 1945
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1945 | Sides of the spire very slightly concave; base strongly flattened, bordered by an acute, subcarinate angulation, with a narrow umbilicus; whorls about 12 in number, the height about one-fourth the width on the later whorls; profile of the upper whorl-surface convex in its upper half, concave as the upper carina of the selenizone is approached; a sharp, narrow groove between the lower carina of the selenizone and the peripheral angulation around the flattened base; the selenizone very narrow, concave, bordered and seemingly restricted by notably thick carinae, each of which bears on its inner slope two revolving lirae, as though the basically rather wide slit were reduced in width in two stages by accretions from each side before it was completely closed by the forward growth of the selenizone from its inward end; columellar lip seemingly straight, reflexed about the umbilicus; ornamentation, on the upper whorl-face moderately strong transverse lirae, stronger and less oblique backwards on the upper, convex half of the whorl-face and finer, more numerous and with increasingly strong obliquity on the lower half, and moderately strong revolving lirae which, again, are stronger above and weaker to the vanishing point below, in the groove between the lower carina and the basal angulation, fine transverse lirae, and on the base fine revolving lirae crossed by faint growth-lines only; shell moderately thick, its structure unknown. |