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Plethospira difficilis
Taxonomy
Pleurotomaria difficilis was named by Whitfield (1890). It is not extant. Its type locality is 227 - Promonotory on west end of Fort Cassin, Lake Champlain., which is in a Cassinian carbonate limestone in the Fort Cassin Formation of Vermont.
It was recombined as Seelya difficilis by Ulrich and Scofield (1897); it was recombined as Plethospira difficilis by Wagner (2023).
It was recombined as Seelya difficilis by Ulrich and Scofield (1897); it was recombined as Plethospira difficilis by Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1890 | Pleurotomaria difficilis Whitfield p. 33 figs. pl. 1 f. 15-16 |
| 1897 | Seelya difficilis Ulrich and Scofield p. 1011 |
| 2023 | Plethospira difficilis Wagner p. 4423 |
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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.
†Plethospira difficilis Whitfield 1890
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, o = order | |||||
| References: Bambach et al. 2007, Wagner 2023 | |||||