Parasites and Parasitoids

A parasite is an organism that lives in or on another species (its host) and benefits by deriving nutrients at the other's expense, resulting in the death of the host. A parasitoid is an insect whose larvae live as parasites that eventually kill their hosts (typically other insects).

This differs from social parasitism, where the "parasite" does not feed directly on their host, but rather benefits from exploiting the host's colony.

Family Chloropidae
Gonzalez et al. (2016) found that Pseudogaurax paratolmos, a fly in the family Chloropidae, parasitizes larvae of Apterostigma dentigerum. Larval ﬂies are solitary ectoparasitoids, each of which attaches to a single ant larva and develops from larva to pupa in 2 wk, consuming nearly the entire host, and then ecloses as an adult 1 wk later. Overall parasitism prevalence was 6.8% of 203 nests, and flies were active during both the dry and rainy seasons. Intensity of parasitism ranged from 18.2 to 100% of larvae attacked per parasitized nest. No other species of Apterostigma that nested in the same localities were parasitized by the flies, including Apterostigma pilosum (n = 93 nests) and Apterostigma auriculatum (n = 10 nests). All immature ants, parasitized or not, as well as immature stages of Pseudogaurax paratolmos, were attended by adult ants that exhibited normal brood care behavior, including covering immatures with mycelia, grooming, and maintaining brood in the fungus garden.

Family Phoridae
See Phorid Flies for further details.

Family Diapriidae
The Diapriidae are a family of parasitoid wasps. These tiny insects have an average length of 2–4 mm and never exceed 8 mm. They typically attack larvae and pupae of a wide range of insects, especially flies. The about 2,300 described species in 150 genera occur world-wide.

Family Eucharitidae
The Eucharitidae are a family of parasitic wasps and are members of the superfamily Chalcidoidea with 55 genera and 417 species. They are found in tropical regions of the world.

Eucharitids are specialized parasitoids of ants, with each species usually only parasitic of one genus of ant. They are one of the few parasitoids that have been able to use ants as hosts, despite ants’ effective defence systems against most parasitoids. Eucharitid parasitism occurs year-round, with a majority of it occurring during hot and humid months. However, the amount of parasitism that occurs depends primarily on the size of the ant colony and the number of host pupae in them, and not on the season.

See Eucharitid Wasps for further details.