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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Ptychagnostus richmondensis
Taxonomy
Agnostus richmondensis was named by Walcott (1884).
It was recombined as Ptychagnostus richmondensis by Palmer (1954).
It was recombined as Ptychagnostus richmondensis by Palmer (1954).
Synonymy list
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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.
†Ptychagnostus richmondensis Walcott 1884
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. R. Palmer 1954 | Cephalon with cheeks scrobiculate; basal glabellar lobes divided; long posterolaterally curved postcephalic spines present. Pygidium with axial lobe bluntly pointed posteriorly, reaching nearly to border; width about equal to that of pleural lobes; posterolateral marginal spines absent. |
Measurements
No measurements are available
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| Source: g = genus, f = family | |||||
| Reference: Hendy 2009 | |||||
Age range: Middle Cambrian or 509.00000 to 497.00000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Cambrian | USA (Utah) | Ptychagnostus richmondensis (77269 77270 77277) |