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Billingsastraea nevadensis
Taxonomy
Billingsastraea billingsi nevadensis was named by Stumm (1937). Its type specimen is USNM 94467 and is a 3D body fossil.
It was recombined as Billingsastraea nevadensis by Merriam (1974).
It was recombined as Billingsastraea nevadensis by Merriam (1974).
Subspecies
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1937 | Billingsastraea billingsi nevadensis Stumm p. 438 figs. pi. 53, fig. 12, pi. 55, figs. 9a-b. |
| 1974 | Billingsastraea nevadensis Merriam pp. 63 - 64 figs. Plate 24, figures 1-3, 5, 6-8 |
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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.
†Billingsastraea nevadensis Stumm 1937
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†Billingsastraea nevadensis arachne Merriam 1974
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Merriam 1974 | This thamnastraeoid Billingsastraea
has uniformly thin finely wavy or zigzag septa and numerous weak zigzag elbow carinae. Longer major septa reach the axis; their waviness generally increases as they approach the center. Minor septa are two- thirds the length of the major septa; their axial tips just enter the tabularium. Concentric dissepiment traces, close-set at the inner margin of dissepimen- tarium, form a false inner ring that normally has no significant thickening. Tabulae are mostly irregular, arched distally, and some of them are complete. Flat outer dissepiments range in size from small to large; inner steeply inclined dissepiments are small. |
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