until the end of the Middle
The great Cephalon is
designed semicircularand has genal spines. The glabella is typically elongated,
prominently segmented and is species-specific anterior broaden or reducing
towards cephalons border. Furthermore the Redlichiida have great crescent eyes.
Most species developed the
type (predators). A wide rostral plate is typically present.
The thorax is highly
segmented whereupon some species has more than 60 segments (Suborder Redlichiina),
whose pleura as arule are ending in pleural spines.
The pygidium is
designed micropygous (Gr.- small), i. e. the pygidium is much smallish developed
than the cephalon. The number of segments ranges from only one to very little