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Acirsa delta
Taxonomy
Acirsa delta was named by Squires and Saul (2003). Its type specimen is LACMIP 13006 and is a 3D body fossil. Its type locality is UCLA loc. 3635, Chico Creek, which is in a Campanian marine siliciclastic in the Chico Formation of California.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2003 | Acirsa delta Squires and Saul p. 37 figs. Figures 48-51 |
| 2018 | Acirsa delta Haggart and Graham p. 284 |
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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.
†Acirsa delta Squires and Saul 2003
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Squires and L. R. Saul 2003 | An Acirsa with fine, subcancellate sculpture. Axial ribs very slightly stronger than spiral ribs. Inter- sections producing a beaded-look. Spiral ribs closely spaced, relatively broad, and separated by much nan'ower linear grooves. Basal part of last whorl with fine, un- beaded spiral ribs. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Kiessling 2004, Beu et al. 1990 | |||||
Age range: base of the Late/Upper Santonian to the top of the Early/Lower Campanian or 85.70000 to 72.20000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Santonian | Canada (British Columbia) | Acirsa delta (210549 210558) | |
| Early/Lower Campanian | USA (California) | Acirsa delta (type locality: 3888) |