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Spiclypeus shipporum
Taxonomy
Spiclypeus shipporum was named by Mallon et al. (2016). Its type specimen is CMN 57081, a partial skeleton, and it is a 3D body fossil. Its type locality is 8 km west-southwest of Winifred, which is in a Campanian crevasse splay mudstone in the Judith River Formation of Montana. It is the type species of Spiclypeus.
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Spiclypeus shipporum Mallon et al. p. 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.
†Spiclypeus shipporum Mallon et al. 2016
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. C. Mallon et al. 2016 | Chasmosaurine ceratopsid with autapomorphic rugose nasal contact on the lateral surface of the dorsal process of the premaxilla. Spiclypeus is also diagnosed by the following unique combination of characters: (1) postorbital horncores project dorsolaterally; (2) all six epiparietals fused at bases; (3) epiparietals P1 and P2 curl anteriorly from posterior margin of frill; (4) epiparietal P3 projects posterodorsally.
With respect to other chasmosaurines from the Judith River Formation (i.e., Judiceratops, Medusaceratops, Mercuriceratops), Spiclypeus can further be distinguished by the large, triangular epiossifications laterally on the parietal and squamosal. It also differs from Judiceratops [6] in the medial embayment of the posterior parietal bar. Spiclypeus lacks the laterally directed epiparietals that characterize Medusaceratops [7], and the hatchet-shaped lateral margin of the squamosal that characterizes Mercuriceratops [8]. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Norman and Weishampel 1991 | |||||
Age range: Late/Upper Campanian or 83.50000 to 70.60000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | USA (Montana) | Spiclypeus shipporum (type locality: 55274) |