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Petalaxis sexangulus
Taxonomy
Lithostrotionella sexangulus was named by de Groot (1963).
It was recombined as Petalaxis sexangulus by Sando (1983).
It was recombined as Petalaxis sexangulus by Sando (1983).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1963 | Lithostrotionella sexangulus de Groot p. 84 figs. pl. 16, figs. 3a-c, 4a, b |
| 1983 | Petalaxis sexangulus Sando p. 29 |
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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 sexangulus de Groot 1963
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. J. Sando 1983 | Petalaxis with corallite diameter 3 to 4 mm and 13 to 15 major septa that ordinarily extend about halfway to the columella and seldom extend into the dissepimentarium. Minor septa poorly developed. Columella a simple slightly thickened axial plate con-nected to the counter septum and to the cardinal septum in some corallites. Dissepimentarium composed of a single :row of small dissepiments. Tabulae mostly com-plete, essentially horizontal, but commonly nearly tent-shaped, turned up at the columella, and irregularly spaced 0.25 to 1 mm apart. Ratio of tabularium width to corallite diameter about 0.8. Mode of increase unknown. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Kiessling 2004 | |||||
Collections
No collection or age range data are available