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Signal Flies - Family Platystomatidae

This page contains pictures and information about Signal Flies that we found in the Brisbane area, Queensland, Australia.
 
Body length 12mm
 
Most flies in this family feed on mammalian faeces. Their larvae habits are varied. Some lives in plant trunk damaged by other insects or fungi.
 
They are medium in size, usually there are at least some dots or patterns on wings. 
 
The Signal Flies are usually found on tree trunks or on leaves where may be a place for courtship, sometimes a few of them were found at the same point. While walking on those surface, Signal Flies exhibit a characteristic manner of movement, something like dancing in our human eyes. Those movements include rowing or extend of wings, waving of front pair of legs, move forwards and backwards, extend and raise of proboscis.  
 
This group of flies contains the spectacular species, the stalk-eyed signal flies. The males have eyes on long stalks extending from either side of their heads. However, we never found them in Brisbane.
 

  
Orange-blue Signal Fly
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Lamprogaster bicolor, body length 10mm
We saw a few of this flies dancing on gum tree trunk. Pictures were taken in Karawatha Forest during mid summer. Head and throax of the fly are orange colour with abdomen in dark metallic blue. Wings are patterned with black spots, leading edge and wing base are orange. Legs are pale orange in colour. Please check this page for more information.
 
 
Orange-green Signal Fly
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Lamprogaster rugifacies, body length 8mm
Head and throax of this fly are orange colour with abdomen in metallic green. Wings are patterned with black spots, leading edge and wing base are orange. Legs are black in colour. Please also check this page for more information.
 
 
Green Signal Fly
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Lamprogaster imperialis, body length 8mm
Abdomen and thorax of this fly are metallic green, with red eyes on black head. Wings are patterned with black spots, leading edge and wing base are pale orange. Legs are also pale orange in colour. We have more pictures and information in this page.
 
 
Boatman Fly
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Pogonortalis doclea, body length 5mm
This fly, when walking, swings it wings like someone swinging the paddles when rowing a boat. We believed this is why they are called Boatman Fly. This fly is small in size, walk with wing open and has the narrowed waist. We believed this fly mimic ant. Please check this page for more pictures and information.
 
 
Brown Signal Fly
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? Euxestomoea sp., body length 8mm
We saw those flies near Bulimba Creek in Wishart on early summer Oct 2007. There were a number of them there on a large tree trunk. Some of them were courting. The courting pair were facing each other, sometimes with tongue touching. There are many more pictures in this page.
 
 
Banded Signal Fly
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Euprosopia armipes or E. anostigma, body length 12mm
The fly is pale brown in colour with brown banded patterns on wings and abdomen. Eyes and all legs are Brown as well. Picture is taken in Alexandra Hill, mid summer.
Reference:
1. Insects of Australia - CSIRO, Division of Entomology, Melbourne University Press, 2nd Edition 1991, p769.
2. The Australian Platystomatidae (Diptera, Schizophora) with a revision of five genera - McAlpine, D.K., 1972, The Australian Museum, p175-177.
 

Reference:
1. Insects of Australia - CSIRO, Division of Entomology, Melbourne University Press, 2nd Edition 1991, p770.
2. The Australian Platystomatidae (Diptera, Schizophora) with a revision of five genera - McAlpine, D.K., 1972, The Australian Museum.
3. Review of the Australasian Genera of Signal Flies (Diptera: Platystomatidae) - DAVID K. MCALPINE, Records of the Australian Museum 53(2): 113–199.  

 
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Last updated: October 11, 2009.