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Petalaxis perapertuensis
Taxonomy
Lithostrotionella (Hillia) perapertuensis was named by de Groot (1963).
It was recombined as Petalaxis perapertuensis by Sando (1983).
It was recombined as Petalaxis perapertuensis by Sando (1983).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1963 | Lithostrotionella (Hillia) perapertuensis de Groot p. 89 figs. pl. 19, figs. la-c, 2a-d |
| 1983 | Petalaxis perapertuensis Sando pp. 30 - 31 |
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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.
†Petalaxis perapertuensis de Groot 1963
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. J. Sando 1983 | Petalaxis with corallite diameter 3.5 to 4.5 mm and 14 to 19 major septa that closely approach the columella but seldom reach it and ordinarily extend across the dissepimentarium to the corallite wall. Minor septa ordinarily well developed. Corallite walls strongly dilated. Columella a simple thickened axial plate con-nected to counter or cardinal septum. Dissepimentarium weakly lonsdaleoid, composed of 1 to 2 rows of small in-flated dissepiments. Tabulae incomplete, essentially horizontal, mostly concave, and spaced 0.25 to 0.5 mm apart. Ratio of tabularium width to corallite diameter 0.6 to 0.8. Increase peripheral. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: Stephanian or 307.50000 to 300.40000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Stephanian | China (Nei Mongol) | Hillia perapertuensis (78560) |