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Ptygmactrum extensum
Taxonomy
Ptygmactrum extensum was named by Cooper and Grant (1976). Its type specimen is USNM 148321b, a shell (Articulated shell), and it is not a trace fossil. It is the type species of Ptygmactrum.
Synonymy list
| Year | Name and author |
|---|---|
| 1976 | Ptygmactrum extensum Cooper and Grant p. 1942 figs. Pl 505, figs 31-58; pl 520, figs 40-44 |
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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.
†Ptygmactrum extensum Cooper and Grant 1976
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 3 | 2.03 | 1.80 | 2.20 | 2.10 | 0.208 |
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| Source: subo = suborder | |||||
| Reference: Aberhan et al. 2004 | |||||