| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Acirsa alpha
Taxonomy
Acirsa alpha was named by Squires and Saul (2003). Its type specimen is LACMIP 13003 and is a 3D body fossil. Its type locality is UCLA loc. 3628, Chico Creek, which is in a Santonian marine horizon in the Chico Formation of California.
Sister species lacking formal opinion data
A. cerithiformis, A. corrugata, A. elatior, A. heyseana, A. kelseyi, A. lanceolata, A. meeki, A. ochotensis, A. solumcostata, A. subplicata, A. erasa, A. pervaricosa, A. striatula, A. corrugata, A. duvergieri, A. lanceolata, A. ofunatoensis, A. oscari, A. parvicostata, A. texana, A. leunisii, A. mioplicatula
Synonymy list
| Year | Name and author |
|---|---|
| 2003 | Acirsa alpha Squires and Saul p. 36 figs. Figures 39-41 |
Is something missing? Join the Paleobiology Database and enter the data
|
|
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 alpha Squires and Saul 2003
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Squires and L. R. Saul 2003 | An Acirsa with fine, subcancellate sculpture. Axial ribs predominant. Spiral ribs somewhat wavy, closely spaced, relatively broad, and with shallow interspaces containing a distinct interrib on anterior part of mature whorls. |