This period of suspended development is an apparent response to the See more. True flies are insects of the order Diptera, the name being derived from the Greek δι- di-"two", and πτερόν pteron "wing". Apart from crop destruction, some insects are carriers of disease, e.g. Sessile Definition. In zoology, sessility applies to those animals which are attached to a substrate.Most often these are marine animals, such as mussels, although parasites such as the cochineal insect assume a fixed life cycle upon their plant hosts. herbiphagy feeding on herbaceous plants. Metamorphosis is a process by which animals undergo extreme, rapid physical changes some time after birth. Insects of this order use only a single pair of wings to fly, the hindwings having evolved into advanced mechanosensory organs known as halteres, which act as high-speed sensors of rotational movement and allow dipterans to perform advanced aerobatics. Diapause, spontaneous interruption of the development of certain animals, marked by reduction of metabolic activity. A pest is an animal which harms humans or human concerns. It is typical of many insects and mites, a few crustaceans and snails, and perhaps certain other animal groups. Definition noun A method of controlling insect population, such as by chemical, biological, or other means Supplement There are several insects that are considered as pests because they are destroying important crops and plants. Arthropods Definition. hemocyte or haemolymph a fluid in the circulatory system of insects containing nutrients, fat, water, etc. Many insects, however, are beneficial from a human viewpoint; they pollinate plants, produce useful substances, control pest insects, act as scavengers, and serve as food for other animals (see below Importance). Carpet beetle larvae damaging a specimen of Sceliphron destillatorius in an insect collection. Furthermore, insects are valuable objects of study in elucidating many aspects of biology … In biology and medicine, a host is an organism that harbours a parasitic, a mutualistic, or a commensalist guest (), the guest typically being provided with nourishment and shelter.Examples include animals playing host to parasitic worms (e.g. An “arthropod” is an invertebrate animal that has an exoskeleton, a segmented body, and jointed appendages.The following families of … insect definition: 1. a type of very small animal with six legs, a body divided into three parts and usually two pairs…. The result of metamorphosis may be change to the organism’s entire body plan, such as a change in the animal’s number of legs, its means of eating, or its means of breathing.. In selected cases, allergy injection therapy is highly effective. The zoological categories of genetics, taxonomy, morphology, physiology, behavior, and ecology are included in this field of study.