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The ensign wasps (family Evaniidae) are a small cosmopolitan group of very distinctive appearance, with 20 extant genera containing some 450 known species. Arthropods are Animals belonging to the Phylum Arthropoda (from Greek ἄρθρον arthron, " Joint " Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described Hymenoptera is one of the larger orders of Insects comprising the sawflies, Wasps Bees and Ants The name refers to Evanioidea is a small Hymenopteran superfamily that includes three families two of which ( Aulacidae and Gasteruptiidae) are much more closely related They have the metasoma attached very high above the hind coxae on the propodeum, and the metasoma itself is quite small, with a long one-segmented petiole, and compressed; the wasps move the abdomen up and down constantly, thus earning them their common name. The metasoma is the posterior part of the body or tagma, of Arthropods whose body is composed of three parts the other two being the Prosoma and the The arthropod leg is a form of jointed Appendage of Arthropods usually used for Walking. The propodeum is the first abdominal segment in Apocrita Hymenoptera ( Wasps Bees and Ants. The metasoma is the posterior part of the body or tagma, of Arthropods whose body is composed of three parts the other two being the Prosoma and the In Entomology, the term petiole is most commonly used to refer to the constricted first (and sometimes second Metasomal segment of members of the Hymenopteran For Wikipedia aspects see WikipediaNaming conventions (common names, WikipediaNaming conventions, and WikipediaStyle manual.
As far as is known, their larvae are predatory on the eggs of roaches; the female wasp lays an egg inside the ootheca (egg case) of the roach host, and the wasp larva hatches quickly and consumes the roach eggs. An ootheca (pl oothecae) is a type of egg mass made by any member of a variety of species (usually Insects or Mollusks) Technically, they are predators, rather than either parasites nor parasitoids as in related wasp groups. Parasitism is a type of symbiotic relationship between Organisms of different Species. A parasitoid is an organism that spends a significant portion of its life history attached to or within a single host Organism which it ultimately kills
One species, Evania appendigaster, has essentially a worldwide distribution, having been introduced along with various roach species. While they do attack insects that are considered pests, they rarely attain population sizes sufficient to act as effective biocontrol agents. Biological control of pests in Agriculture is a method of controlling pests (including Insects Mites Weeds and plant diseases