(1) They produced several types of foliage all characterized by pinnate leaves with open dichotomous venation .(2) Most Paleozoic insects are known only by their wing venation since wings are the least degradable parts of insects.(3) The medium green colored leaves are long and linear with parallel venation .(4) Reticulate leaf venation may also provide physiological advantages in forest understories.(5) Leaves have parallel venation , with veins converging at the tip of the leaf.(6) They differ from some of the more slender Palaeodictyoptera of the time, which they otherwise resembled, chiefly in venational characters and in possessing a long caudal style.(7) Most Paleozoic insects are known only by their wing venation since wings are the least degradable parts of insects, so phylogenetic schemes will rely on venational characters.
