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Ptarmigania bispinosa
Taxonomy
Ptarmigania bispinosa was named by Lochman (1952). Its type specimen is U.S.N.M. No.115760, a cephalon/head (cranidium), and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1952 | Ptarmigania bispinosa Lochman pp. 133-134 figs. 1-9 |
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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.
†Ptarmigania bispinosa Lochman 1952
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Lochman 1952 | The Mexican species is very similar to P. rossensis (Walcott) in the structure of the cranidium, showing only an occipital node rather than the usual strong spine. In the pygidium it appears that the four pairs of marginal spines were of medium length, and the species differs from all other described forms in the possession of two axial spines and the axial node on the third segment of the pygidium. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Aberhan et al. 2004, Hendy et al. 2009 | |||||
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Delamaran - Menevian | Mexico | Ptarmigania bispinosa (10687) |