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Tylasteria prisca
Taxonomy
Tylaster priscus was named by Valette (1928). It is not extant. Its type specimen is Lectotypes at University of Burgundy and University Claude Bernard Lyon 1.
It was corrected as Tylaster priscum by Valette (1929) and Mercier (1935); it was recombined as Tylasteria prisca by Valette (1929) and Breton (1992).
It was corrected as Tylaster priscum by Valette (1929) and Mercier (1935); it was recombined as Tylasteria prisca by Valette (1929) and Breton (1992).
Synonymy list
| Year | Name and author |
|---|---|
| 1928 | Tylaster priscus Valette pp. 62-64 figs. fig. 6 |
| 1929 | Tylaster priscum Valette pp. 29-36 figs. pl. 5, fig. 1-5 |
| 1929 | Tylasteria prisca Valette p. 418 |
| 1935 | Tylaster priscum Mercier pp. 17-18 figs. pl. 1, fig. 9a-d |
| 1992 | Tylasteria prisca Breton pp. 252-259 figs. fig. 109; pl. 28, fig. 11; pl. 29; pl. 3 |
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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.
†Tylasteria prisca Valette 1928
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Breton 1992 | Form stellate, robust. Disk and arms clearly differentiated. Interbrachial arc concave. Arms slender. Marginal plates short, numerous. Superomarginal and inferomarginal plates alternating. One row of abactinal plates separates the superomarginals on the entire arm length. Inferomarginals larger than the superomarginals. Profile of the superomarginal convex. Profile of the inferomarginals angular. Abradial side of the marginals verticals. External face domed. Ornament of large, dense granule-pits, of variable size. The largest ones projecting in the center of the external face. Adradial side of the superomarginals smooth. Terminal conical, with distally a face for articulation of one spine. |