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Robber Fly Eating Green Bottle Fly
Photograph - Original Art By Bob Orsillo
Robber Fly Eating A Green Bottle Fly - Original nature photography by Bob Orsillo
Adult stages are medium to large (3/8 to 1-1/8 inch) flies often observed on stems of plants, on the ground or flying low. Species vary in appearance and some mimic wasps and bees. Most species are gray to black, hairy-bodied, have a long, narrow, tapering abdomen containing segments that may be banded, patterned or contrasting in color. The heads of adults have a depression between the eyes when viewed from the front. They have long, strong legs for grabbing prey.
Some robber flies resemble bees in a appearance but can readily be separated since true flies have only one pair of wings. However, bee flies (Diptera: Bombyliidae) are another family of flies, and include many species of stout-bodied, yellow haired flies often seen hovering or resting on the ground or on flowers in open, sunny areas. Many have wings marked with darker patterns and they hold their wings outstretched. Larvae are parasitic on immature stages of other insects including Coleoptera, Diptera, Hymenoptera, Lepidoptera, Neuroptera and Orthoptera.
Life Cycle: Adults lay eggs in the soil or in plants. Eggs hatch into slender, shiny, white, legless larvae that develop through several stages before pupating. The life cycle usually requires more than one year to complete.
Habitat and Food Source(s): Adults have piercing-sucking mouthparts. Adult robber flies perch on stems of low plants or other objects and attack prey in the air. They feed on bees, beetles, dragonflies, other flies, grasshoppers, leafhoppers, wasps, and other insects. Larvae live in the soil, in wood and other habitats, feeding on organic matter, other arthropods such as white grubs, beetle pupae and grasshopper egg masses, and they may be carnivorous.
Pest Status: Adults prey on a variety of arthropods; considered to be beneficial insects, except for those that feed on bees and other beneficial insects; adults, handled improperly, are capable of inflicting a painful bite.
DRAGON FLY .....
A dragonfly is an insect belonging to the order Odonata, the suborder Epiprocta or, in the strict sense, the infraorder Anisoptera (from Greek ανισος anisos, "uneven" + πτερος pteros, "wings", because the hindwing is broader than the forewing). It is characterized by large multifaceted eyes, two pairs of strong transparent wings, and an elongated body. Dragonflies can sometimes be mistaken for damselflies, which are morphologically similar; however, adults can be differentiated by the fact that the wings of most dragonflies are held away from, and perpendicular to, the body when at rest. Dragonflies possess six legs (like any other insect), but most of them cannot walk well. Dragonflies are among the fastest flying insects in the world.
Dragonflies are important predators that eat mosquitoes, and other small insects like flies, bees, ants, wasps, and very rarely butterflies. They are usually found around marshes, lakes, ponds, streams, and wetlands because their larvae, known as "nymphs", are aquatic. Some 5680 different species of dragonflies are known in the world today.
Though dragonflies are predators, they themselves are subject to predation by birds, lizards, frogs, spiders, fish, water bugs, and even other large dragonflies.
GREEN BOTTLE FLY ...................
The name green bottle fly (or greenbottle fly) is applied to numerous species of blowfly, in the genera Lucilia and Phaenicia (the latter is sometimes considered a subgenus of the former). These flies are found in most areas of the world, and the most well-known species is the common greenbottle, Phaenicia sericata (or Lucilia sericata, depending on authority), though there are other common species such as Lucilia caesar, Lucilia cuprina, Lucilia coeruleiviridis, and Lucilia illustris. The maggots of this fly are known to preferentially consume dead tissue while leaving live tissue intact, and so have been sold for use in maggot therapy, primarily during the years before the widespread use of antibiotics and medicines and in modern times due to a resurgence of medical literature documenting their effectiveness. These flies are known to lay eggs in cadaver tissue in the wild within hours after death. The developmental stage of their larvae in the cadaver can be used to accurately predict the time death occurred.
January 24th, 2013
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