Knowra Pterygota Pterygota Pterygota is the insect group encompassing winged insects and descendants whose lineages secondarily lost their wings. Its members are distinguished from primitively wingless insects by their evolutionary ancestry.
Insect : An arthropod with a three-part body, three pairs of legs, one pair of antennae, and usually wings. Pterygota is a major group within this broader animal class.
Insect flight : Flight powered by the movement of insect wings and coordinated thoracic muscles. It is the locomotor capability that wings made possible in ancestral pterygotes.
Paleoptera : A traditional grouping of early-diverging winged insects, including mayflies and dragonflies. These insects represent major surviving branches near the base of pterygote diversification.
Insect biodiversity : The variety of insect species, lineages, traits, and ecological roles. Pterygotes comprise most insect diversity and occupy an exceptional range of habitats.
Arthropod : An invertebrate with a segmented body, jointed appendages, and an external skeleton. Insects, including all pterygotes, belong to this larger animal phylum.
Direct flight muscle : An insect flight muscle that attaches directly to a wing base and moves it through contraction. Some pterygotes move their wings through muscles acting directly on the wing hinges.
Neoptera : The large insect group whose members can flex their wings over the abdomen. Wing-folding distinguishes this vast branch from the paleopteran condition.
Insect dispersal : The movement of insects between locations, including colonization of new habitats. Flight enabled many pterygotes to cross barriers and expand their geographic ranges.
Insect wing : A membranous outgrowth of the insect thorax used primarily for flight. Wings are the defining ancestral feature of the group, even where they were later lost.
Indirect flight muscle : An insect flight muscle that deforms the thorax to move the wings indirectly. Many pterygotes power rapid wingbeats by changing thoracic shape rather than pulling wings directly.
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