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Oryctocephalus americanus

Trilobita - Corynexochida - Oryctocephalidae

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.

Synonymy list
YearName and author
1979Oryctocephalus americanus Palmer and Halley p. 956 figs. Plate 4, ®gures 1 - 4, 7 - 8
2003Oryctocephalus americanus Sundberg and McCollum p. 956 figs. Plate 4, ®gures 1 - 4, 7 - 8

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
subphylumArtiopoda(Hou and Bergstrom)
RankNameAuthor
classTrilobitaWalch 1771
orderCorynexochida
suborderCorynexochinaKobayashi 1935
familyOryctocephalidaeBeecher 1897
subfamilyOryctocephalinaeBeecher 1897
genusOryctocephalusWalcott 1886
speciesamericanus

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
ReferenceDiagnosis
F. A. Sundberg and L.B. McCollum 2003Cranidium 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.