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View Thread :: Identification queries :: Diptera (adults)
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Is this Siphona sp. ID-able?
#1 Print Post
Posted on 17-01-2022 17:07

Location: Wageningen
Posts: 22
Joined: 20.06.17

I found this Siphona sp. last year on a flower of Jacobaea vulgaris, in a small area that is being 'naturalized' over the past three years. I wondered whether this might be a Siphona species that can be identified from photos.

See also
date: 2021-09-14
locatone: Wageningen - 't Pasje (GE)


Thanks in advance!

Rayan Majoor
#2 Print Post
Posted on 17-01-2022 18:38

Location: Soest, NL
Posts: 17162
Joined: 21.07.04

Looks like a straightforward S. geniculata

#3 Print Post
Posted on 25-01-2022 21:03

Location: Wageningen
Posts: 22
Joined: 20.06.17

Hi Theo,

thank you! I read in another topic that the Siphonas often were difficult or impossible to ID, but this species is an exception then? Or do you just have to be able to see the right characteristics? And if so, is there some identification key I could use?

Kind regards,
Rayan Majoor
#4 Print Post
Posted on 26-01-2022 08:20

Location: Soest, NL
Posts: 17162
Joined: 21.07.04

The bad news: Siphona are hopelessely difficult and require a lot of experience.
Theo good news: geniculata is by far the most common one and the most easy to recognize.
So always sart with the question “Is it geniculata or not “?

If it checks these
* syntergite 1&2 with strong central marginal bristles
* parafacial relatively broad
* parafacial with a lot of hairs ( > 10)
* third antennal segment shorter

than you have geniculata !

#5 Print Post
Posted on 25-03-2022 21:06

Location: Wageningen
Posts: 22
Joined: 20.06.17

Ah, that is very helpful to know. Thank you again! I will definitely keep photographing these fellas and just hope that they are identifiable.

Kind regards,
Rayan Majoor
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Date and time
26 June 2022 20:32


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