to Upper Devonian.
As a rule the big cephalon's running out into broad
genal spines at posterior thorax regions level, respectively posterior
of the pygidium. The
sutures are running ophistoparian or they are articulately
shrinked. The convex glabella, featuring 1 to 3 pairs of furrows, is
anterior tapering. As a rule the eyes are reduced to bulging tubercles
consits of at least 12, but mostly of more up to 30 segments. The rachis
is protuding articulated. The flat pleura featuring furrows articulated.
tail shield is smaller (singnificant) than the Cephalon. It reduces