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Diptera.info :: Identification queries :: Diptera (adults)
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Coelopa cf. frigida, juvenil
Volker Achterberg
#1 Print Post
Posted on 15-11-2023 21:01
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Location: northern Germany, Hamburg
Posts: 257
Joined: 03.03.21

date: 16 Oct. 2023; location: flies on the north beach of the main island of Helgoland, island in the North Sea; a lot of seaweed/kelp at the shoreline;
many dark-brown flies with almost black thorax (probably Coelopa frigida or pilipes), but the flies on the pictures look somewhat different: more grey on thorax and also grey parts on their legs. Which species might this be? A variant of Coelopa sp.?
Thanks for any comments and best regards, Volker
Volker Achterberg attached the following image:


[271.13Kb]
Edited by Volker Achterberg on 16-11-2023 10:12
 
Volker Achterberg
#2 Print Post
Posted on 15-11-2023 21:01
Member

Location: northern Germany, Hamburg
Posts: 257
Joined: 03.03.21

2nd picture
Volker Achterberg attached the following image:


[211.91Kb]
Edited by Volker Achterberg on 15-11-2023 21:02
 
Fred Fly
#3 Print Post
Posted on 16-11-2023 07:25
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Location: Germany
Posts: 391
Joined: 19.07.11

Your specimen seems to be fresh emerged from pupa and therefore has not reached the final and darker coloration. The large specimens as from Helgoland were described as Coelopa gravis Haliday, 1833 which proved to be junior synonym of Coelopa frigida (Fabricius, 1805).
Regards
Edited by Fred Fly on 16-11-2023 07:25
 
Volker Achterberg
#4 Print Post
Posted on 16-11-2023 09:56
Member

Location: northern Germany, Hamburg
Posts: 257
Joined: 03.03.21

Thanks a lot, Fred Fly (nice name), for your comment.
That these flies are 'fresh' specimens of C. frigida (or subspecies gravida) is a good explanation for their colouration, because there were large amounts of pupae on the beach and also some freshly hatched flies visible (see attached picture).
Best regards, Volker
Volker Achterberg attached the following image:


[236.31Kb]
 
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