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Donaldina gracilis
Taxonomy
Donaldina gracilis was named by Erwin (1988). Its type specimen is USNM 400695, a shell, and it is not a trace fossil. Its type locality is USNM712f, Ruddy Tank, Hueco Mountains, which is in an Artinskian shallow subtidal limestone in the Hueco Formation of Texas.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1988 | Donaldina gracilis Erwin |
| 2002 | Donaldina gracilis Pan and Erwin p. 34 |
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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.
†Donaldina gracilis Erwin 1988
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 2 | 4.98 | 4.70 | 5.27 | 4.98 | 0.403 |
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: Artinskian or 290.10000 to 283.30000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Artinskian | USA (New Mexico) | Donaldina gracilis (101770 101771 101795 101797) | |
| Artinskian | USA (Texas) | Donaldina gracilis (type locality: 101773) |