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Bonnia sonora
Taxonomy
Bonnia sonora was named by Lochman (1952). Its type specimen is U.S.N.M. No.115736, a cephalon/head (cranidium), and it is a mold.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1952 | Bonnia sonora Lochman pp. 99-100 figs. 1-7 |
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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.
†Bonnia sonora Lochman 1952
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Lochman 1952 | This species is described from a single small cranidium and seven pygidia ranging from 4 mm. by 2 mm. to 8 mm. by 4 mm. All the pygidia are poorly preserved; only one specimen shows the very small marginal spine. The species is close to three described species but differs from them as indicated. Bonnia tensa Resser and Bonnia fieldensis (Walcott) have all proportions and convexity practically the same, but both differ in that the glabella merges into the border as the marginal furrow is almost obsolete; and B. tensa Resser also has a steeper frontal slope of the glabella. A small cranidium in the B. fieldensis lot, which is the same size as the Mexican specimen, differs from it in exactly the same features as the larger B. fieldens is cranidia. This indicates that the specific features are already established in cranidia of this small size. Pygidia of the same size as B. fieldens is and B. sonorado not show any differences.The Mexican species is closest to fall to B. columbensis Resser from the Mount Whyte formation. The cranidium differs in (i) the steep slope of the front part of the fixed cheeks, and (2) the nearly flat profile of the glabella. In the pygidium of B. columbens is the marginal furrow is more distinct, especially around the back, and the posterior border tends to flatten out. With the present limited material representing both species, it is possible that, when more material is obtained, the Mexican species can be shown to be the same as B. columbensis Resser. |
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class | |||||
| References: Hendy et al. 2009, Whittington et al. 1997, Hendy 2009, Aberhan et al. 2004 | |||||