Tag Archives: Fairyfly

Fall 2014 SMTP Interesting Finds: Wasps (Order: Hymenoptera)

Wasps (Order: Hymenoptera)

The Hymenoptera are one of the largest orders of insects, comprising the sawflies, wasps, bees and ants. Over 150,000 species are recognized, with many more remaining to be described. The name refers to the wings of the insects, and is derived from the Ancient Greek ὑμήν (hymen): membrane and πτερόν (pteron): wing. During the Fall 2014 School Malaise Trap Program you collected 1058 species of Hymenoptera across all participating schools. We have highlighted some of your interesting finds below.

Fairyfly (Anagrus ustulatus)

Fairyflies, despite their name, are actually very tiny wasps, and can be found in temperate and tropical regions throughout the world. They average only 0.5 to 1.0 mm long and they include the world’s smallest known insect, the Alaptus fairyfly, with a body length of only 0.139 mm, and the smallest known flying insect, at only 0.15 mm long.

While many insects form complicated social groups – think of ants and bees, for example – the fairyfly is just the opposite. Although they get together for mating, there’s no courtship and no family groups among fairyflies. This makes them relatively hard to study, which is why much of their behavior is still a mystery to scientists.

Fairy Fly2
Fairyfly (Anagrus ustulatus)

Fairyflies are some of the most common chalcid wasps, but are rarely noticed by humans because of their extremely small sizes. This apparent invisibility, their delicate bodies, and their hair-fringed wings have earned them their common name. Their adult lifespans are very short, usually lasting for only a few days. All known fairyflies are parasitoids of the eggs of other insects, and several species have been successfully used as biological pest control agents.

Fairyflies were abundantly caught during the Fall 2014 School Malaise Trap program, with specimens being collected at 49 of the 59 participating schools!