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Retroceramus priscus
Taxonomy
Retroceramus priscus was named by Sey (1972). It is not extant.
It was recombined as Mytiloceramus priscus by Sey (1972), Sey and Kalacheva (1980).
It was recombined as Mytiloceramus priscus by Sey (1972), Sey and Kalacheva (1980).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1972 | Mytiloceramus priscus Sey |
| 1972 | Retroceramus priscus Sey |
| 1980 | Mytiloceramus priscus Sey and Kalacheva |
| 1985 | Retroceramus priscus Koschelkina p. 65 figs. Pl 14, figs 1-4 |
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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.
†Retroceramus priscus Sey 1972
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| valve height | 4 | 54.8 | 49.0 | 68.0 | 52.0 | 8.62 |
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| Source: f = family, subc = subclass, c = class | |||||
| References: Aberhan et al. 2004, Kiessling 2003, Eaton 1871 | |||||
Age range: Opalinum or 174.70000 to 170.90000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Aalenian | Russian Federation | Mytiloceramus priscus (129811) | |
| Opalinum | Russian Federation | Retroceramus priscus (137347) |