Mecoptera (scorpionflies): head elongate with slender mandibulate mouthparts, crossviened wings and males external genitalia recurved looks like a scorpion's tail.
Mecoptera (scorpianflies): head elongate with slender mandibulate mouthparts, slender/crossviened wings, male genitalia recurved and looks like a scorpion.
Neuroptera (lacewings): 2 membranous wings of similar size, complex wing venation, wings held tent-like at rest, large compound eyes, well developed chewing/pinching mouthparts.
Lepidoptera (moths and butterflies): sucking mouthparts (haustellum), large compound eyes, 2 pairs of membranous wings with overlapping scales.
Collembola (springtails): elongate/cylindrical shape, beaded antennae, mouthparts hidden by cheeks, forked-tail organ.
Strepsiptera: 1-8mm, large berry-like eyes, fan-like antennae, forewings reduced to knobs and large membranous hind wings.
Diptera: One pair of membranous wings,hind wings became halteres, sucking mouthparts and short antennae.
Megaloptera: Dark coloured and flexible bodies, 2 pairs of membranous wings of same size often with dark patches, at rest wings are held roof-like over the body.
Thysanoptera (thrips): small, slender and elongate body parts, sucking/rasping mouthparts,when winged it has 2 pairs of slender membranous/fringed wings.
Pscoptera (barklice/booklice): head prominent, "neck," 2 pairs of wings/wingless, wings held tent-like, front wings larger than hind wings.
Phthiraptera (lice): small, eyes reduced/absent,antennae short, suctorial/ mandibulate mouthparts.
Protura: tiny, elongate/cylindrical body, eyes and antennae absent.
Diplura: abdomen with 10 visible segments, 2 cerci long/forceps-like
Archaeognatha (bristletails): elogate body that tapers towards the back, wingless, compound eyes, 3 slender cerci with the middle one much longer.
Ephemeroptera (mayflies): 2 pairs of membranous wings, hindwings much smaller than forewings, short antennae and 2/3 very long terminal filaments.
Siphonaptera (fleas): laterally compressed bodies, enlarged hind legs, backward pointing hairs, small antennae that tuck away into grooves on the head.