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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 15:05

Posts: 124
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 15:13
#2 Print Post
Posted on 05-08-2021 15:24

Location: Soest, NL
Posts: 17164
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 16:01

Posts: 124
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 07:44

Location: Soest, NL
Posts: 17164
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 07:46

Location: Soest, NL
Posts: 17164
Joined: 21.07.04
#6 Print Post
Posted on 06-08-2021 15:12

Posts: 124
Joined: 16.03.11

Thanks again Theo.
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Date and time
27 June 2022 12:56


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