What are the external features of insects? Information about the body partsof insects, their features and functions.
External Features Of Insects
Insects belong to the phylum Arthropoda and share a number of characteristics with other arthropods. Like lobsters, spiders, ticks, and other arthropods, insects are characterized by jointed legs and other appendages, a segmented body, and a tough body covering that serves as the animal’s skeleton. Unlike other arthropods, adult insects never have more than three pairs of legs, usually have two pairs of wings, and have a body that is divided into three distinct parts: a head, a thorax, and an abdomen. Arising from these basic body divisions are the various appendages.
The appendages arising from the head are the antennae and the mouthparts, and those arising from the thorax are the legs. It is believed that the primitive ancestors of insects had one pair of appendages on each abdominal segment, and a few living insects, such as the bristletails, still have many abdominal appendages. Most other living insects, however, do not have true appendages on the abdomen but have modified appendages that are the external genital organs and the cerci, structures that serve as touch receptors. The wings of insects are not appendages but are outgrowths of the body covering, or cuticle.