Lepidoptera - Butterflies and moths
"In addition to three pairs of legs on the thorax, they have two to eight pairs of fleshy abdominal prolegs that are structurally different from the thoracic legs." (Projects.ncsu.edu)
"Antennae present. Antennae are long and slender in female moths and generally feathery in male moths. Butterflies have clubbed antennae" (Ento.csiro.au)
Hemiptera - insects such as true bugs , bed bugs, etc.
"Mouthparts usually fold under the body like a clasp knife" (http://www.bumblebee.org/invertebrates/Hemiptera.htm)
"The true bugs often have long antennae divided into a small number of segments, and the front wings can be somewhat hardened." (https://www.amentsoc.org/insects/fact-files/orders/hemiptera.html)
Diptera - insects that fly such as mosquito, fruit flies, etc.
"Adult flies are only able to ingest liquid foods due to their sucking and/or piercing mouthparts." (http://www.ento.csiro.au/education/insects/diptera.html)
"Flies only have 2 eyes, but each of their eye has over 4,000 lenses (allowing the creatures to see 360 degrees)." (http://rubygemstone.weebly.com/characteristics-and-facts-about-flies-diptera---insects.html)
Odonata - flying insects such as dragonflys, damselfly, etc.
"Legs end in a powerful pair of claws." (http://www.bumblebee.org/invertebrates/Odonata.htm)
"Some adult dragonflies live for only a few weeks while others live up to a year." (http://www.smithsonianmag.com/science-nature/14-fun-facts-about-dragonflies-96882693/)
Orthroptera - insects such as grasshoppers, cricket, etc.
"Some grasshoppers lay their eggs in the soil and then inject froth that mixes with the soil to form an egg pod." (http://www.orthoptera.org.uk/fun_facts)
"Orthoptera are an order of insects that have enlarged hind legs which accommodate muscles for jumping." (http://www.orthoptera.org.uk/facts)
Phasmidea - stickbugs, leaf bugs
"Stick insect species, often called walking sticks, range in size from the tiny, half-inch-long (11.6-millimeter-long) Timema cristinae of North America, to the formidable 13-inch-long (328-millimeter-long) Phobaeticus kirbyi of Borneo." (http://animals.nationalgeographic.com/animals/bugs/stick-insect/)
"Females are usually wingless, some males have wings." (http://www.bumblebee.org/invertebrates/Phasmida.htm)
Mantodea - mantisis
"There are over 2,200 species of the Mantis." (http://www.bioexpedition.com/mantis/)
"Masters of camouflage, they make use of protective coloration to blend in with the foliage and even mimic aspects like leaves, sticks, and blades of grass." (http://www.newworldencyclopedia.org/entry/Mantodea)