Final answer:
The term Odontata, now largely replaced by the term Odonata, refers to a group of insects that includes dragonflies and damselflies, named for their tooth-like processes on their lower jaw.
Step-by-step explanation:
The order Odontata is an obsolete grouping in the classification of insects, which approximately corresponds to the modern order Odonata. The order Odonata primarily includes insects commonly known as dragonflies and damselflies. The name 'Odontata' refers to 'toothed jaws,' a feature of these insects where their lower jaw has a row of sharp, tooth-like processes used for catching and consuming prey.
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