Encyrtidae

Encyrtidae; Temporal range:
	Anicetus communis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Superfamily:	Chalcidoidea
Family:	Encyrtidae; Walker, 1837
Subfamilies
	Encyrtinae; Tetracneminae
Diversity
	Two subfamilies of around 3710 species in 455 genera

Encyrtidae is a large family of parasitic wasps, with some 3710 described species in about 455 genera. The larvae of the majority are primary parasitoids on Hemiptera, though other hosts are attacked, and details of the life history can be variable (e.g., some attack eggs, some attack larvae, others are hyperparasites, and some Encyrtidae develop as parasitoids of ticks). They are found throughout the world in virtually all habitats, and are extremely important as biological control agents. They may also present as an ecological threat to the population of some species. For example, the endangered Papilio homerus butterfly is parasitized at a rate of 77%,[1] making them the main contributor to egg mortality in this (and other) butterfly species.

Some species exhibit a remarkable developmental phenomenon called "polyembryony", in which a single egg multiplies clonally in the host and produces large numbers of identical adult wasps. Even more remarkably, some of the larvae are larger than the others and act in a similar way to the "soldiers" of eusocial insects, attacking any other wasp larvae already in the body of the host, and dying without reproducing ("altruism").

Wasps in this family are relatively easy to separate from other Chalcidoidea by features of the wing venation, the migration of the cerci forwards on the metasoma (and accompanying distortion of the tergites), and a greatly enlarged mesopleuron with anteriorly positioned mesocoxae.

Encyrtid thorax; "h" is the mesopleuron, and "j" is the mesocoxa

An extinct genus Archencyrtus has been described from the Middle Eocene age Sakhalin amber in Eastern Russia.[2]

References

Garraway, Eric; Bailey, A. J. A.; Freeman, B. E.; Parnell, J. R.; Emmel, T. C. (2008). Insect Conservation and Islands. Springer, Dordrecht. pp. 189–203. doi:10.1007/978-1-4020-8782-0_16. ISBN 9781402087813.
Simutnik, S.A. (2014). "The first record of Encyrtidae (Hymenoptera, Chalcidoidea) from the Sakhalin amber". Paleontological Journal. 48 (6): 621–623. doi:10.1134/s0031030114060124. S2CID 86655697.

External links

Universal Chalcidoidea Database
Image Database TOBIKOBACHI Based on the Encyrtid Wasp Collection of Dr. T. Tachikawa
Ageniaspis citricola on the UF / IFAS Featured Creatures Web site
Diaphorencyrtus aligarhensis on the UF / IFAS Featured Creatures Web site

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[1] Garraway, Eric; Bailey, A. J. A.; Freeman, B. E.; Parnell, J. R.; Emmel, T. C. (2008). Insect Conservation and Islands. Springer, Dordrecht. pp. 189–203. doi:10.1007/978-1-4020-8782-0_16. ISBN 9781402087813.

[Simutnik2013-2] Simutnik, S.A. (2014). "The first record of Encyrtidae (Hymenoptera, Chalcidoidea) from the Sakhalin amber". Paleontological Journal. 48 (6): 621–623. doi:10.1134/s0031030114060124. S2CID 86655697.