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Petalaxis occidentalis
Taxonomy
Lithostrotion (Lithostrotionella) occidentalis was named by Merriam (1942). Its type specimen is Cornell 38694 and is a 3D body fossil. Its type locality is S20, 2.25 miles N of Sherman Ranch, Grindstone-Twelvemile Creek area, which is in a Kungurian marine limestone/sandstone in the Coyote Butte Formation of Oregon.
It was recombined as Petalaxis occidentalis by Sando (1983), Wilson (1985), Fedorowski et al. (2007) and Stevens (2009).
It was recombined as Petalaxis occidentalis by Sando (1983), Wilson (1985), Fedorowski et al. (2007) and Stevens (2009).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1942 | Lithostrotion (Lithostrotionella) occidentalis Merriam |
| 1983 | Petalaxis occidentalis Sando p. 32 figs. Plate 20, figures 1, 2 |
| 1985 | Petalaxis occidentalis Wilson p. 10 figs. 8a-b |
| 2007 | Petalaxis occidentalis Fedorowski et al. p. 166 |
| 2009 | Petalaxis occidentalis Stevens p. 13 figs. 9.1-9.3 |
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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.
†Petalaxis occidentalis Merriam 1942
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. J. Sando 1983 | Petalaxis with corallite diameter 4.5 to 6.5 mm and 16 to 19 major septa that closely approach the columella but seldom reach it and extend into the dissepimentarium, commonly being attached to the cor-allite wall. Minor septa well developed. Corallite wall dilated and denticulate. Columella a simple thickened axial plate connected to the counter or cardinal septum. Dissepimentarium weakly lonsdaleoid, composed of 1 to 2 rows of small inflated dissepiments Tabularium con-sists of a peripheral zone of clinotabellae and a periaxial zone of mostly complete, horizontal, flat or concave tabulae spaced 0.25 to 0. 75 mm apart. Ratio of tabularium width to corallite diameter about 0.6. Mode of increase unknown. |