Cephalon: typically effaced, opisthoparian facial sutures, but sutures distinctly divergent anteriorly; glabella expands forwards, lateral furrows often faint or absent; hypostome impendent (conterminant, but hypostome no longer matching anterior glabellar border); extra-axial cephalic muscle impression (lunette) present; doublure broad.
Thorax 8-10 segments.
Pygidium: isopygous or subisopygous, rounded posteriorly, usually with short axis.