Late Carboniferous-Late Permian | phylum = Arthropoda | subphylum = Hexapoda | classis = Insecta | superordo = Odonatoptera | ordo = Protodonata | ordo_authority = C. Brongniart, 1893 | subdivision_ranks = Families | subdivision = Meganeuridae Paralogidae }} The Protodonata or Meganisoptera are an extinct order of very large to gigantic Palaeozoic (Late Carboniferous to Late Permian) insects, similar in appearance to, and related to, dragonflies. Most were only slightly larger than modern drag… (More on Protodonata)