Gold-headed Blue Tachinid Fly
Two-spotted Cylindrical Fly
|Class:||Animals (Animalia) - Jointed Legs (Arthropoda) - Insects (Insecta)|
|Family:||Bristle Fly (Tachinidae) iNaturalist Observation|
|Species:||Two-spotted Cylindrical Fly (Cylindromyia bimacula)|
Thank you Tony Daley for identifying and Tony and Jenny Dominelli for helping with the id of this species for us
General Species Information:
Found on Ellura (in the Murray Mallee, SA) and elsewhere
1st Record in SA on Atlas
~11mm long. Yellow face, black body & red abdomen.
Thick setae (possibly multiple in clumps) along the top of the abdomen. At least 3 pairs in a row, with the posterior setae also lining up, making 4 pairs, but seem longer, thinner & sharper. It's probable the thick setae here have been snapped off, as they are longer with other specimens on-line. We thought this was Cylindromyia tricolor, but Tony Daley highlighted the different wing venation below.
Tony Daley said "This one is a male as it lacks frontal orbital bristles (at least 2 proclinate frontal orbitals for females).
For males, the underside shot showing the long, distally crinkly, hairing on the hind trochanter and femora was the clincher for C. bimaculata in the key.
Following Cantrell (1984), this one belongs in the bimaculata-group of species that have the following in common: wings lacking dark costal stripe; "medium to large size; thorax dark; abdomen black with extensive reddish orange coloration on intermediate tergites; M1 bend acute with appendix".
Species in this group: ampla, angustissimifrons, bigoti, bimacula, expansa, rieki, and unguiculata.
C. tricolor is ungrouped. It is distinguished as colouration similar to bimaculata but M1 bend obtuse and without appendix. The form of the bend of wing vein M1 (or what I normally refer to as just the M vein) thus being important."