Long-legged flies, Family Dolichopodidae, make up quite a large family and together with the shore flies, Family Ephydridae, are amongst the most common true flies to be encountered along the shores of our ponds, lakes and streams.
Unlike the pesky houseflies, which are nusiance mongerers, Long Legged flies are beneficial, in that they prey upon insect pests such as mites, aphids, flea hoppers, booklice, thrips, silverfish, caterpillars and even other files, amongst others, so that they are desirable, perhaps even welcome guests, in the yard and garden.
Unlike the vast majority of insects that flee upon being approached too closely, these dainty flies are not easily spooked from their chosen perches, making them ideal photography subjects. Though, that being said, if you’re utilizing loud shutter click or a bright flash, they will invariably jump up, but will eventually settle down if you’re persistent and choose to diffuse the flash a wee bit. I used the silent shutter option of Canon EOS 5D Mark III and captured it with Canon EF 100mm f/2.8L Macro IS USM fitted with Canon MT-24EX macro twin light flash. I diffused the Canon MT-24EX flash with a half cut plastic cup, thereby allowing the light to spread evenly, in a significantly better fashion.
Long legged flies range in size from 1-9 mm., and as is evident from the photographs presented here, for your viewing pleasure, they posses some of the nicest pairs of legs to be found in the crawling kingdom, and with a slender figure to boot, are fully capable of making any model that ever walked the ramp, green with envy.
Sporting brilliant, metallic hues, in shades green, bronze and blue, there are over 7000 species of these beautiful flies, placed in about 200 genera, the world over.
The larvae, which are typically maggot like in form and shape, are found in damp soil or amidst mossy boulders, in the immediate vicinity of their favoured habitats, namely marshes, ponds, rivers and streams. When the final instar spins a cocoon it encapsulates soil particles and assorted pieces of debris from the earth, into its little package.
Since these oft overlooked insects are quite sensitive to changes in the local environment, they make useful indicators for site quality assessment in the field of conservation biology, planning and development. An area with a high Dolichopodid diversity is generally considered to be a healthy, unperturbed site, whereas a low diversity is an indication of a disturbed, environmentally unsound habitat.
Adult long legged flies will sometimes visit flowers for nectar, in order to meet their carbohydrate requirements, so remember to include some flowering plants in your garden. 😉
EXIF info – Aperture : ƒ/11 | Camera : Canon EOS 5D Mark III | Taken : 20 October, 2013 | Exposure bias : -4.7EV | Flash fired : no | Focal length : 100mm | ISO : 100 | Location : 13° 4.0311′ 0″ N 74° 59.7279′ 0″ E | Shutter speed : 1/125s | Images and content Copyright © Krishna Mohan. Please contact me to purchase prints or for image publication license.