Lesser House Fly
Lat. “Fannia canicularis“
species
of family
“Lesser House Flies and Allies“
1 species
The lesser house fly or little house fly, Fannia canicularis, is somewhat smaller (3.5–6 mm (0.14–0.24 in)) than the common housefly. It is best known for its habit of entering buildings and circling near the center of rooms. It is slender, and the median vein in the wing is straight. Larvae feed on all manner of decaying organic matter, including carrion. Among the Fanniidae, this species is the one most frequently associated with myiasis.
Morphology
Fannia canicularis is a slim fly reaching a length of from 4 to 6 mm. The white-bordered eyes meet above in the male, a condition described as holoptic. In females, the eyes do not meet. The brown-grey thorax has three black, longitudinal stripes in the males. These are much less distinct in the female. The first two segments of the abdomen are translucently yellow with a dark-brown basal colour. The dark trapezoid marks of the males are hardly recognizable in the females. The halteres are yellowish.
Development
The females lay their eggs in batches of up to 50 and may lay up to 2,000 eggs altogether. The eggs, which are white with a pair of dorsal longitudinal flanges or wings, can float in liquid and semiliquid decaying organic matter, especially poultry, cow and dog feces, kitchen waste such as the end of putrid potatoes or carrots, silage and compost, cheese, bacon, and drying fish. They are commonly found in garbage depots, wheelie bins, garbage trucks, and other places where food waste is stored. The eggs hatch after only two days (24 to 48 hours at 24–27 °C or 75–81 °F) and the larvae require six or more days to reach pupation, which lasts seven or more days, so they usually take about 2–4 wk to develop into adults, depending upon temperature. The cycle repeats in very damp, putrid excrement, liquid manure, etc.
Behaviour
Fannia canicularis is spread worldwide. They have a life expectancy of two to three weeks. In Central Europe, about seven generations can develop per year. They are often found on excrement and on vertebrate animals. Because of their oscillating between excrement and human food, they are considered possible disease carriers. They have also been noted as vectors of Thelazia californiensis. Adult flies in Massachusetts were found year round except for February, though their months of activity vary by location and they may also be absent during hot summers. The lesser housefly comes frequently into buildings and is noticeable by its peculiar, silent flight in the room center, where it circles down-hanging articles, particularly lamps. It changes the flight direction jerkily. This is a patrol flight, in which the males supervise, if necessary, their district and attack intruders. Males adjust themselves to face head down while resting if they have adequate surfaces to turn on and are more likely to rest when there are not many flies around. During the night hours, the flies sit in high places and may leave small excrement or regurgitation marks. Outdoors, trees sheltered from wind and direct sunlight serve the flies for their swarm dances.
External links
Media related to Fannia canicularis at Wikimedia Commons Data related to Fannia canicularis at Wikispecies
Ancestry Graph
Further Information
Copyright
This article uses material from the Wikipedia article Fannia canicularis the free encyclopedia Wikipedia which is released under Creative Commons Attribution-ShareAlike 4.0 International License). On Wikipedia a list of authors is available.