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The Society for the study of flies (Diptera)

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#1 2019-07-02 13:15:57

Andrew18
Registered user
Name: Andrew Matthews
Registered: 2019-07-02
Posts: 5

Nematocera Identification Assistance

Hi all!

I am an undergraduate currently working on a research project investigating the effect of Alaskan lupin on invertebrate assemblages at Skalanes Nature and Heritage Centre, Iceland. During one of my sweep net transects across some native dwarf shrub habitat I collected several small flies however I am now struggling to pinpoint some of these specimens to family level.

I am currently thinking Chironomidae but compared to the other Chironomids that I have identified, it is several millimetres larger (total body length around 5mm) with an enlarged abdomen, antennae also have a few hairs but not as pronounced as previous specimens. No ocelli visible, first tarsal segment larger than second, anal cell visible, no visibly forked M vein, spurs visible but small.

I am very new to Diptera Identification so apologies if I am missing something very obvious!

If anyone can help me with this that would be fantastic!

(uploading pictures at the moment)


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Last edited by Andrew18 (2019-07-02 13:36:38)

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#2 2019-07-02 14:51:46

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 834

Re: Nematocera Identification Assistance

Hi Andrew. Welcome to the Dipterists Forum.
Your mystery nematoceran is Chironomidae - a female, either Chironominae or Orthocladiinae (No m-cu cross-vein). Check the front legs. As a rule, if the metatarsus (basal tarsal segment) is shorter than the tibia, it's Orthocladiinae, if its longer than the tibia, it's Chironominae. (As with all rules, there are a few exceptions!)

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#3 2019-07-06 22:08:10

Andrew18
Registered user
Name: Andrew Matthews
Registered: 2019-07-02
Posts: 5

Re: Nematocera Identification Assistance

Ah brilliant thanks for the help! I think it must be an Orthocladiinae then!

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#4 2019-07-07 10:26:02

Rainieria
Committee
Name: Darwyn Sumner
Registered: 2008-02-20
Posts: 394
Website

Re: Nematocera Identification Assistance

Since you mention Lupins, it might be worth keeping an eye open for Chyliza leguminicola that uses Lupinus polyphyllus (another Lupin native to North America) as host and is in Denmark.
The article is at https://www.cabdirect.org/cabdirect/abs … 0123010497
Bygebjerg, R., Munk, T., & Elnif, J. (2011). Chyliza leguminicola Melander, 1920 (Diptera: Psilidae) new to the Palaearctic fauna. Entomologiske Meddelelser, 79(2), 7384.
We've got one species (a Chamaepsila) from my Recording Scheme in the Faroe Islands (http://micropezids.myspecies.info/node/320) be nice to find something in Iceland.


Darwyn Sumner
DF Bulletin Editor, Scheme Organiser: Stilt & Stalk Flies

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