New material, including a complete exoskeleton, from the Bromide Formation of Oklahoma, allows a complete evaluation of ProbolichasPhleger, 1936 and necessitates a quantitative revision of the lichid tribe Tetralichini Phleger, 1936. A strict consensus tree of nine equally parsimonious trees generated from a branch and bound analysis indicates that the genus Probolichas is monophyletic, and should no longer be restricted as synonymous with, or as a sub-clade of AmphilichasRaymond, 1905. The genus ApatolichasWhittington, 1963 is revised as a synonym of Amphilichas, and the Tetralichini is defined as clade with three genera: Amphilichas, Probolichas, and LyralichasWeber, 1948. Probolichas kristiae from the Bromide Formation and Amphilichas effnensis from the Effna Formation of Virginia are new species.

You do not have access to this content, please speak to your institutional administrator if you feel you should have access.