It is difficult to describe a generalized pattern for the
enteric valve (P2) in the species of Syntermitinae. In
most species it is composed by elongated ridges, covered
more or less densely with aciculiform or triangular
spines, and with triradial symmetry, as described here
for Procornitermes. However, the shape of the ridges
varies among the species; for example, in Cornitermes
the ridges are lobate, while in Embiratermes they are
columnar. Some groups clearly differ from this pattern:
in Armitermes, Mapinguaritermes, Uncitermes and Labiotermes
the arrangement of ridges is clearly asymmetrical;
in Silvestritermes the symmetry is hexaradial and
the ridges are covered with stout spines; and in Syntermes
the P2 has no ornamentation or ridges.