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View Thread :: Identification queries :: Diptera (eggs, larvae, pupae)
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Unknown larvae
#1 Print Post
Posted on 01-09-2020 21:03

Posts: 66
Joined: 01.04.19

Any ideas? Taken in South Africa in a small subtropical stream
Seafry attached the following image:

John Carr
#2 Print Post
Posted on 02-09-2020 18:49
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Location: Massachusetts, USA
Posts: 8038
Joined: 22.10.10

There is a key to families of larvae in Manual of Afrotropical Diptera (free download). My first guess was Empidoidea, but perhaps some other Orthorrhapha.
#3 Print Post
Posted on 03-09-2020 08:47
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Location: Amsterdam, NL
Posts: 970
Joined: 29.05.09

My first guess was a Limoniidae, for it has a fully developed head capsule and dorsal and ventral pseudopods. It reminded me a bit of Lipsothrix species, larvae of those live in deaf wood in brooks. But the anal segment with the spine is unlike Lipsothrix I know. There are some Limoniidae known with a spine but the genera have a reduced head capsule.
Edited by atylotus on 03-09-2020 08:47
#4 Print Post
Posted on 03-09-2020 13:29
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Location: Amsterdam, NL
Posts: 970
Joined: 29.05.09

Stumbled upon a drawing of the larva of Asioditomyia japonica (Ditomyiidae) which comes a bit close to your larve.
It is depicted as fig. 98 in Krivosheina, 2012. Howver, in her key on Palaearctic nematocera larva she writes on Ditomyiidae that Ditomyia and Asioditomyia has the penultimate segment dorsally with 2 long acute sclerotized projections, carrying spiracles, and this is a discriminating feature to separate the genera from Symmerus sp. So, does your larva has 1 or 2 spines on the penultimate segment?
atylotus attached the following image:

Edited by atylotus on 03-09-2020 13:50
#5 Print Post
Posted on 03-09-2020 13:47
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Location: Amsterdam, NL
Posts: 970
Joined: 29.05.09

and photo 40 with Ditomyia sp from the same book.
atylotus attached the following image:

Edited by atylotus on 03-09-2020 13:47
Tony Irwin
#6 Print Post
Posted on 04-09-2020 15:59
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Location: Norwich, England
Posts: 6231
Joined: 19.11.04

Perhaps foolishly, I had excluded Ditomyiidae as they have previously been recorded from terrestrial situations (fungi and wood). I suppose this might have been an accidental visitor to the stream.
Tony Irwin
#7 Print Post
Posted on 08-09-2020 19:47

Posts: 66
Joined: 01.04.19

Thank you for the discussion
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