The spectacularly-crested Nyctosaurus is sometimes included in this family, though usually placed in its own family, the Nyctosauridae (Nicholson & Lydekker, 1889).
Nyctosaurus, sa svojom nevjerovatnom krijestom, ponekada se uključuje u tu porodicu, mada se obično svrstava u vlastitu porodicu Nyctosauridae (Nicholson & Lydekker, 1889).