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Palaeacmaea
Taxonomy
Palaeacmaea was named by Hall and Whitfield (1872).
It was assigned to Mollusca by Hall and Whitfield (1873); and to Metazoa by Webers and Yochelson (1999).
It was assigned to Mollusca by Hall and Whitfield (1873); and to Metazoa by Webers and Yochelson (1999).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1872 | Palaeacmaea Hall and Whitfield p. 242 |
| 1873 | Palaeacmaea Hall and Whitfield |
| 1999 | Palaeacmaea Webers and Yochelson p. 599 |
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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.
G. †Palaeacmaea Hall and Whitfield 1872
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†Palaeacmaea discoides Perner 1903
†Palaeacmaea horizontalis Perner 1903
†Palaeacmaea magnifica Twenhofel 1928
†Palaeacmaea postuma Böhm 1895
†Palaeacmaea typica Hall and Whitfield 1872
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. F. Webers and E. L. Yochelson 1999 | Patelliform to medusiform organisms having a subcentral apex, and circular to elliptical shape; ornamentation of several concentric undulations, formed by low ridges and low troughs of equal width. |
Measurements
No measurements are available
No ecological data are available
Age range: base of the Nemakit-Daldynian to the top of the Ladinian or 538.80000 to 237.00000 Ma
Collections (13 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Nemakit-Daldynian | China (Guizhou) | P. sp. (86666) | |
| Cambrian | USA (Wisconsin) | Palaeacmaea indet. (230) | |
| Cambrian | USA (New York) | Palaeacmaea indet. (254) | |
| Trempealeauan | USA (New York) | P. typica (74542 74543) | |
| Demingian | USA (New York) | P. expansa (427) | |
| Kunda | Estonia | P. constricta (56202) | |
| Sarka | Czech Republic | Palaeacmaea indet. (3857) | |
| Aseri | Estonia | P. constricta (56200 56201) | |
| Richmondian | Canada (Quebec) | P. magnifica (63660) | |
| Pridoli | Czech Republic (Praha) | P. discoides (155864) | |
| Ladinian | Italy | P. postuma (138255) |