This group of spirurid nematodes consists of a single genus, Pterygodermatites, that has been recovered from cats. The adults of these worms live in the small intestine and utilize insect intermediate hosts. The larvae can also survive in paratenic hosts, and it appears that cats likely become infected by the ingestion of infected lizards or frogs. Other species are found in rodents and occasionally primates. All members of this superfamily possess a sclerotized buccal capsule and rows of lateroventral spines that are distinctive.