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View Thread :: Identification queries :: Diptera (adults)
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Gender of Acroceridae
#1 Print Post
Posted on 05-08-2021 16:05

Posts: 65
Joined: 16.03.11

Acrocera orbiculus. Taken as half of what appeared to be a pair in copula. Back at the ranch I cannot distinguish between them. Should I be able to see an obvious external difference in the terminalia? Do both sexes have holoptic eyes? Isolated elder bush on Bedfordshire, UK chalk. 29 July 2021.
colinleb attached the following image:

Edited by colinleb on 05-08-2021 16:13
#2 Print Post
Posted on 05-08-2021 16:24

Location: Soest, NL
Posts: 16652
Joined: 21.07.04

In Acrocera, it is dead simple

scutellum yellow -> male
scutellum black ->. female

wait for the forthcoming fieldguide to flies with three pulvilli (yours truely & Andre Schulten)

#3 Print Post
Posted on 05-08-2021 17:01

Posts: 65
Joined: 16.03.11

Thank you Theo. In that case both individuals are male. Apparent mating just the result of over-readiness I guess.
#4 Print Post
Posted on 06-08-2021 08:44

Location: Soest, NL
Posts: 16652
Joined: 21.07.04

So can also check the genitalia, but is tricky. Female have long cerci, often taken for male genitalia.
Most Acroceridae are sexed vice versa !
If you have both genders, it should be obvious.
But if you do not, this is of little help

#5 Print Post
Posted on 06-08-2021 08:46

Location: Soest, NL
Posts: 16652
Joined: 21.07.04
#6 Print Post
Posted on 06-08-2021 16:12

Posts: 65
Joined: 16.03.11

Thanks again Theo.
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Date and time
06 December 2021 13:48


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23.09.21 15:29
All sorted.

16.09.21 22:24
Sorry put 5 new threads in Asilidae forum instead in Syrphidae forum, can pleas an admin move it to Syrph? THANKS, Norbert

09.09.21 07:48

09.09.21 07:47
wing ventation is totally different

03.09.21 12:51
Hi, what's the major difference between dolichopodidae and rhagionidae? Can someone help me? Thanks!

28.06.21 15:24
thx TO eklans

03.06.21 11:11
@Tony Irwin Thank you Tony! I've emailed you there Pfft

02.06.21 22:26
Rob - can you PM me with an e-mail address, and I'll send it over.

02.06.21 13:16
Hello chaps! Does anyone have a copy of: Revision of the willow catkin flies, genus Egle Robineau-Desvoidy (Diptera: Anthomyiidae), in Europe and neighbouring areas ?? I'd be ever so grateful! Rob

31.05.21 14:31
The part that got deleted is "longer, dark median stripe on thorax"

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