Diptera.info :: Identification queries :: Diptera (adults)
 Hydrophorus oceanus (was: Orthoceratium?)
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| Klaas |
Posted on 03-12-2008 19:42
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 Member Location: Posts: 655 Joined: 15.10.08 |
Netherlands, Waddenzee, near Moddergat, 24-7-2008. On clay in salt water area. Species is ca 6,5 mm. Thank you in advance, Klaas dorsal view Klaas attached the following image:  [142.13Kb] Edited by Klaas on 04-12-2008 22:05 |
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| Klaas |
Posted on 03-12-2008 19:43
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Member Location: Posts: 655 Joined: 15.10.08 |
also dorsal, more magnified
Klaas attached the following image:  [127.28Kb] |
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| Igor Grichanov |
Posted on 04-12-2008 08:31
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 Member Location: St.Petersburg, Russia Posts: 1810 Joined: 17.08.06 |
No, it is Hydrophorus. Compare with wing of Orthoceratium lacustre Igor Grichanov attached the following image:  [16.74Kb] Edited by Igor Grichanov on 04-12-2008 08:33 Igor Grichanov |
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| Klaas |
Posted on 04-12-2008 10:20
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Member Location: Posts: 655 Joined: 15.10.08 |
After i focused on hydrophorus just on general appearance, i neglected it because of the size of the fly (6,5 mm). Now i start to believe i must be mistaken in that meassurement. It has only two spines at scuttelum, so it should be Hydrophorus oceanus? Do you agree in this ? Thank you Igor. Klaas |
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| Igor Grichanov |
Posted on 04-12-2008 16:27
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Member Location: St.Petersburg, Russia Posts: 1810 Joined: 17.08.06 |
Hydrophorus oceanus. Why not? If you are sure that the lateral setae on scutellum are not broken or covered with wing base. Body size of oceanus is 2.1-3.8 mm. Body size together with wing (as well as leg span) on your doli photo can reach 5-6 mm.
Edited by Igor Grichanov on 05-12-2008 09:29 Igor Grichanov |
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| Klaas |
Posted on 04-12-2008 19:17
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Member Location: Posts: 655 Joined: 15.10.08 |
I allways write down the bodylength, without the wings. I believe you are right about the species, but a mismeasurement of 200 % in size makes it a bit uncomfortable for me. I am pretty sure about the two bristles on scuttelum, so i think that i must keep this one for Hydrophorus oceanus. I have no idea wether that species is rare or commen at the Dutch coast. Klaas |
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