Xenocephalites
Species
Xenocephalites phillipsi Imlay, 1953
Much denser, finer ribbing than X. bearpawensis
Occurrence: Rierdon Formation (Kepplerites mclearni beds)
Reference: Imlay, 1953
![Specimen Photo](XenocephalitesPhillipsi.jpg)
Xenocephalites phillipsi
Photograph from Imlay, 1953
Xenocephalites bearpawensis Imlay, 1953
Strongest and most widely spaced ribs of any species in genus
Occurrence: Rierdon Formation (Kepplerites mclearni beds)
Reference: Imlay, 1953
![Specimen Photo](XenocephalitesBearpawensis.jpg)
Xenocephalites bearpawensis
Photograph from Imlay, 1953
Xenocephalites cf. X. nikitini (Burckhardt)
Known from one fragment
Occurrence: Rierdon Formation (Kepplerites mclearni beds)
Reference: Imlay, 1953
![Specimen Photo](XenocephalitesNikitini.jpg)
Xenocephalites cf. X. nikitini
Photograph from Imlay, 1953