Terozoa quadridens Perkins, 1962 (Hymenoptera: Ichneumonidae, Tryphoninae) is an ectoparasitoid that only parasitizes mature larva of the sawfly Aprosthema tardum (Hymenoptera: Tenthredinoidea, Argidae).
The 14 mm long Aprsothema larva is approached with great caution and the female wasp positions herself in front of the larva. From this position, the metasoma is stretched between the legs towards the head of the larva and an egg is deposited behind the head of the eating larva. The ovipositor is inserted during that time for 2:43 minutes, while the host continued to feed apparently unaffected. From the first moment the Aprosthema larva is approached, it has taken about 60 minutes before the egg was deposited.
In the parasitoid complex of Aprosthema tardum, four parasitic wasp species (family Ichneumonidae) depend on Aprosthema tardum larvae for their survival. Two are endoparasitoids in the subfamily Ctenopelmatinae, which lay internal eggs in the body of the host larva, and two are ectoparasitoids in the subfamily Tryphoninae, which lay external eggs on the skin of the host larva. The host larva can continue its development after attack (parasitoids allowing that are termed koinobionts). Once a cocoon is made by the host larva, the parasitoid larva kills its host in order to accomplish its own development and makes a second cocoon inside the host cocoon.
Shaw, M.R., Kan, P., Kan-van Limburg Stirum, B. & Wahl, DB. (2022) - Biological and morphological studies on the parasitoids (Hymenoptera, Ichneumonidae) of Aprosthema tardum (Klug) (Hymenoptera, Argidae, Sterictiphorinae) in Var, southern France. Journal of Hymenoptera Research.
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Негізгі бет Ғылым және технология Terozoa quadridens parasitizes an Aprosthema larva behind the head
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