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These species are notable for the plesiomorphic retention of venation (albeit already quite reduced) in their tegmina, segmented cerci , and pentamerous tarsi.
They have no eyes, antennae, or caudal cerci but have a telson tail, which is common in crustaceans but absent in other hexapods.
By analogy with modern arthropods this zone was inferred to lie at the anterior of a terminal ventral body segment-the telosoma and the antenniform cerci of Olenoides serratus might be interpreted as belonging to that segment.
In L. forcipatus females the ovipositor valves reach the tips of the cerci ; in L. disjunctus they do not.
The cerci (tail appendages) begin to disarticulate.
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