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Ischyrinia norvegica
Taxonomy
Ischyrinia norvegica was named by Soot-Ryen (1960). Its type specimen is UO 38267, a shell, and it is a 3D body fossil. Its type locality is Furuberget, Cyclocrinus shale, which is in a Harnagian/Soudleyan marine shale in the Furuberget Formation of Norway.
Synonymy list
| Year | Name and author |
|---|---|
| 1960 | Ischyrinia norvegica Soot-Ryen pp. 127 - 128 figs. Plate 1, fig. 2, 3 |
| 1976 | Ischyrinia norvegica Pojeta and Runnegar p. 64 figs. pl. 19 f. 10-14 |
| 2023 | Ischyrinia norvegica Wagner p. 3098 |
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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.
†Ischyrinia norvegica Soot-Ryen 1960
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. Soot-Ryen 1960 | Carapace convex, nearly equilateral, umbo bluntly pointed, sllghtly turned backwards. Anterior margin rounded, ventral margin cvenly convex, posterior margin ncarly straight, posteroventral corner distinct, and posterodorsal margin straight. Posterior part broader than the anterior part but slightly longer. Anterior and posterior clavicles strong, the anterior one curved, continuing in a shallower, nearly horizontal slight ridge which forms a low connection between the two clavicles, the posterior clavicles straighter and broadest dorsally, bordered posteriorly by a sulcus separating the clavicle from a ridge which is extended to the middle of the posterior margin and there divided into two ridges by a median sulcus. These sulci and ridges are naturally reversed on the east. | |
| J. Pojeta and B. Runnegar 1976 | Elongate Ischyrinia lacking a posterior carina. |