| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Taxonomy
Cyrena difficilis was named by Deshayes (1860). It is extant.
Sister species lacking formal opinion data
C. albertensis, C. anomala, C. arnouldi, C. cretatcea, C. cuneiformis, C. cycladiformis, C. deperdita, C. forbesi, C. garumnica, C. gibbosula, C. huarazensis, C. intermedia, C. laletana, C. media, C. obliquata, C. obovata, C. obtusa, C. pisum, C. pulchara, C. pulchra, C. securis, C. sirena, C. sirena, C. sirena, C. sirena, C. solitaria, C. suborbicularis, C. tellinella, C. valdensis, C. subtrigonalis, C. brongniarti, C. brongniarti, C. convexa, C. convexa, C. convexa, C. acuta, C. floridana, C. pompholyx
Synonymy list
| Year | Name and author |
|---|---|
| 1860 | Cyrena difficilis Deshayes p. 513 figs. pl. 37, figs. 3-5 |
| 1953 | Cyrena difficilis Hassan p. 20 |
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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.
Cyrena difficilis Deshayes 1860
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Aberhan et al. 2004 | |||||
Age range: Late/Upper Eocene or 37.71000 to 33.90000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Eocene | Greenland | Cyrena difficilis (88292) |