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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), Mercier (1935); it was recombined as Tylasteria prisca by Valette (1929), Breton (1992).
It was corrected as Tylaster priscum by Valette (1929), Mercier (1935); it was recombined as Tylasteria prisca by Valette (1929), 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. |
Measurements
No measurements are available
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| Source: f = family, c = class, p = phylum | |||||
| References: Aberhan 1992, Blake 1990, Aberhan et al. 2004 | |||||
Age range: base of the Late/Upper Bathonian to the top of the Late/Upper Oxfordian or 168.20000 to 154.80000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Bathonian | France | Tylaster priscum (72284) | |
| Late/Upper Callovian | France | Tylasteria prisca (97871) | |
| Middle Oxfordian | France | Tylasteria prisca (62708 62715 62724) | |
| Late/Upper Oxfordian | France | Tylasteria prisca (62726) |