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Oryctocephalus americanus
Taxonomy
Oryctocephalus americanus was named by Sundberg and McCollum (2003). Its type specimen is USNM 517583, a cephalon/head, and it is a 3D body fossil. Its type locality is USNM 41978, Split Mountain, Clayton Ridge, which is in a Delamaran offshore shelf lime mudstone/lime mudstone in the Emigrant Formation of Nevada.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1979 | Oryctocephalus americanus Palmer and Halley p. 956 figs. Plate 4, ®gures 1 - 4, 7 - 8 |
| 2003 | Oryctocephalus americanus Sundberg and McCollum pp. 956 - 960 figs. Plate 4, figures 1 - 4, 7 - 8 |
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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.
†Oryctocephalus americanus Sundberg and McCollum 2003
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. A. Sundberg and L.B. McCollum 2003 | Cranidium with a parallel-sided glabella, S1 transglabellar furrow, eye ridges directed moderately posterolaterally, moderately wide ®xigena (71 6 8 per cent glabellar width), intergenal spines, slightly curved anterior margin, and anterior border without curvature towards frontal lobe. Twelve thoracic segments, each with flat pleural spines. Pygidium with two axial rings; anterior pleural bands long (exsag.), posterolaterally to posteriorly directed with flat spines; and V1 to V2 spines decreasing in size and projecting posteriorly. |
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 | |||||
Age range: Delamaran or 509.70000 to 505.30000 Ma
Collections (19 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Delamaran | USA (Nevada) | Oryctocephalus americanus (69402 69405 69406 69409 69414 69428 69430 69434 69436 type locality: 69437 69440 69443 69446 69456 69480 69482 69486 69487 69489) |