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Lunulacardium semistriatum
Taxonomy
Lunulacardium semistriatum was named by Münster (1840) [DISTRIBUTION: Devonian.
Type is a neotype, as the holotype is lost.]. Its type specimen is MB.M.2232.8, a shell, and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1840 | Lunulacardium semistriatum Münster p. 69 figs. pl. 13 f. 9 |
| 1870 | Lunulacardium semistriatum Stoliczka |
| 1895 | Lunulacardium semistriatum Beushausen p. 362 figs. pl. 27 f. 1-4 |
| 2007 | Lunulacardium semistriatum Nagel-Myers and Amler pp. 53 – 54 figs. txt-f. 4; Pl. 1 Figs. 1–10 |
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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.
†Lunulacardium semistriatum Münster 1840
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Nagel-Myers and M. R. W. Amler 2007 | Transverse to subcircular in outline, slightly wider than high. Margins subcircular, merging regularly into each other. Anterior portion of dorsal margin straight, posterior part slightly convex. Shell truncated posteriorly, creating a straight to slightly concave edge. Posterior to the edge valve declining abruptly perpendicular or with more or less acute angle. Declining shell portion deviating in the sagittal plane of the valve into the thin, fragile posterodorsal portion of shell (e.g., Pl. 1 Figs. 1, 10). Posterodorsal shell portion carrying faint ornamentation of shell body (Pl. 1 Figs. 8, 9); declining portion of valve developing strong, irregular corrugations, more or less parallel to late ridge of carina (Pl. 1 Figs. 5, 7). Valves probably slightly gaping. Hinge line straight to slightly convex, dentition unknown. Umbo small, central, opisthogyrate, partly cut off by truncation. Juvenile shell veneriform, completely twisted anticlockwise compared to shell body by an 90° angle and not affected by truncation (Fig. 4). Ornamentation consisting of coarse radial ribs, less distinct on dorsal portion of shell. Fine comarginal growth lines and additional strong comarginal rugae (Pl. 1 Figs. 1, 3). Pallial line and adductor scars not observable. |