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Acirsa nexilia
Taxonomy
Ceratia nexilia was named by White (1889). Its type specimen is USNM 20119a (lectotype) and is a 3D body fossil. Its type locality is USGS loc. 405, Pentz Area, which is in a Campanian coastal siliciclastic in the Chico Formation of California.
It was recombined as Acirsa nexilia by Squires and Saul (2003).
It was recombined as Acirsa nexilia by Squires and Saul (2003).
Sister species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1889 | Ceratia nexilia White p. 451 figs. PLATE III, Figs. 13,14 |
| 1903 | Mesostoma intermedium Whiteaves p. 360 figs. Pl. 43, fig. 4 |
| 2003 | Acirsa nexilia Squires and Saul p. 39 figs. Figures 55-61 |
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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 nexilia White 1889
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Invalid names: Mesostoma intermedium Whiteaves 1903 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Squires and L. R. Saul 2003 | A medium-sized Acirsa with subcancellate sculpture. Axial ribs stronger than spiral ribs. Approximately 24 axial ribs. Interspaces between spiral ribs with one secondary spiral interrib. Basal part of last whorl with very fine cancellate sculpture. |