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Lithaster jurassicus
Taxonomy
Pentaceros (Oreaster) jurassicus was named by von Zittel (1876). It is not extant. Its type specimen is Paläontologischen Staatssammlung, München. It is the type species of Lithaster.
It was recombined as Pentaceros jurassicus by von Zittel (1883) and Fraas (1886); it was recombined as Lithaster jurassicus by Hess (1977) and Hess (1991).
It was recombined as Pentaceros jurassicus by von Zittel (1883) and Fraas (1886); it was recombined as Lithaster jurassicus by Hess (1977) and Hess (1991).
Synonymy list
| Year | Name and author |
|---|---|
| 1876 | Pentaceros (Oreaster) jurassicus von Zittel p. 236 figs. fig. 372a |
| 1883 | Pentaceros jurassicus von Zittel p. 461 figs. fig. 333a |
| 1886 | Pentaceros jurassicus Fraas pp. 252-254 figs. pl. 30, fig. 5-6 |
| 1977 | Lithaster jurassicus Hess pp. 322-327 figs. fig. 1-3 |
| 1991 | Lithaster jurassicus Hess p. 889 |
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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.
†Lithaster jurassicus von Zittel 1876
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. Hess 1977 | Form large, stellate (R=72mm). Long and slender arms (R/r ratio equals 3.8). 21 to 23 pairs of marginal plates per alf-arc. A single row of abactinal plates in the arm, vis-à-vis of marginal plates. Abactinal plates large, thick, tabulate, strongly imbricated at the base. Ventro-lateral area restricted to the disk. |