They were characterized by beak-like mouthparts, and similarity, between their fore- and hindwings, and an additional pair of winglets on the prothorax, in front of the first pair of wings.
They are known as "six-winged insects" because of the presence of a pair of wings on each of the thoracic segments.

The mouthparts were elongated, and included sharp piercing stylets, and possibly a sucking pump-like organ.
Unlike modern sucking insects, such as the Hemipterans, the mouthparts were held vertically below the head, or projected forwards.
They probably used these organs to suck juices from plants, although some may have been ectoparasites, or predators.

Some types attained huge size.
For example, Mazothairos had a wingspan of about 55 centimetres (22 in).
Another distinctive feature was the presence of unusually long cerci, about twice the length of the abdomen.

The Palaeodictyoptera are a paraphyletic assemblage of basal palaeodictyopteroidean insects, rather than a clade, because they gave rise to other insect orders.
They range in time from the Middle Carboniferous (late Serpukhovian or early Bashkirian in age) to the late Permian.
They were characterized by beak-like mouthparts, and similarity, between their fore- and hindwings, and an additional pair of winglets on the prothorax, in front of the first pair of wings. They are known as "six-winged insects" because of the presence of a pair of wings on each of the thoracic segments.
The mouthparts were elongated, and included sharp piercing stylets, and possibly a sucking pump-like organ. Unlike modern sucking insects, such as the Hemipterans, the mouthparts were held vertically below the head, or projected forwards. They probably used these organs to suck juices from plants, although some may have been ectoparasites, or predators.
Some types attained huge size. For example, Mazothairos had a wingspan of about 55 centimetres (22 in). Another distinctive feature was the presence of unusually long cerci, about twice the length of the abdomen.
The Palaeodictyoptera are a paraphyletic assemblage of basal palaeodictyopteroidean insects, rather than a clade, because they gave rise to other insect orders. They range in time from the Middle Carboniferous (late Serpukhovian or early Bashkirian in age) to the late Permian.
Palaeodictyoptera