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Tonkinella spinosa
Taxonomy
Tonkinella spinosa was named by Sundberg (2006). Its type specimen is USNM 529342, a pygidium (complete pygidium), and it is a 3D body fossil. Its type locality is USNM Loc. 42248, Horse Thief Canyon, Last Chance Range, which is in a Delamaran marine horizon in the Emigrant Formation of California.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Tonkinella spinosa Sundberg pp. 67 - 69 figs. Fig. 5A - J |
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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.
†Tonkinella spinosa Sundberg 2006
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. A. Sundberg 2006 | Glabella expanding forward (120- 135% basal glabellar width), frontal lobe moderately convex with no medial sulcus, S1 transglabellar furrow effaced to moderately developed, S2 and S3 very shallow, connected to axial furrows. Ocular ridges effaced, moderately posterolaterally directed (75°), palpebral lobe length 25-40% glabellar length. Plectrum absent, anterior border horizontal. Pygidium with spines on the anterior three or four pleural segments, no curvature of anterior border of pygidium, pleural furrows shallow to moderately deep, reaching margin; with 13-15 pleural ribs, anterior pleural ribs with slight backward curvature of the distal portion, posterior pleural rib moderately narrow with rib width 6 ± 1% pygidial width. Pygidial axis moderately long (75 ± 4% pygidial length), with 5-6 axial rings. |
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class | |||||
| References: Aberhan et al. 2004, Hendy et al. 2009, Hendy 2009, Whittington et al. 1997 | |||||