|Description:||Under a very low magnification of only 11X, this scanning electron microscopic (SEM) image depicted some of the morphologic details found on the exoskeletal surface of an unidentified hornet discovered in the suburbs of Decatur, Georgia. In this particular view, which centers on the insect’s body where its midsection, or thorax, attaches to its abdomen by the “petiole”, you’ll note its two forewings, left hindwing, and sensorial “hairs” covering almost the entire exterior. Like its exoskeleton, all of these structures are composed of “chitin”.|
Chitin is a molecule made up of bound units of acetylglucosamine, joined in such a way as to allow for increased points at which hydrogen bonding can occur. In this way chitin provides increased strength, and durability as an exoskeletal foundation. This chitinous exoskeleton gives rise to a myriad of morphologic shapes, including these “scales”, setae, antennae, legs, and mouthparts.
This hornet was a member of the Phylum Arthropoda, i.e., Arthro = jointed, and poda = legs, and the class Insecta, for it possessed three pairs of these jointed extremities. The hair-like setae provided the hornet with data indicative of changes encountered in its environment such as chemical, thermal, and tactile queues.