High Quality Content by WIKIPEDIA articles! The name Aculeata is used to refer to a monophyletic lineage of Hymenoptera. The word "Aculeata" is a reference to the defining feature of the group, which is the modification of the ovipositor into a stinger (thus, the group could be called stinging wasps). In other words, the structure that was originally used to lay eggs is modified instead to deliver venom. Not all members of the group can sting; in fact, a great many cannot, either because the ovipositor is modified in a different manner (such as for laying eggs in crevices), or because it is lost altogether. This group includes the bees and ants and all of the eusocial Hymenopterans; it is, in fact, commonly believed that the possession of a venomous sting was one of the important features promoting the evolution of social behavior, as it confers a level of anti-predator defense rarely approached by other invertebrates.

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