Thread subject: Diptera.info :: Hydrophorus oceanus (was: Orthoceratium?)
Posted by Klaas on 03-12-2008 19:42
#1
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
Edited by Klaas on 04-12-2008 22:05
Posted by Klaas on 03-12-2008 19:43
#2
also dorsal, more magnified
Posted by Igor Grichanov on 04-12-2008 08:31
#3
No, it is
Hydrophorus.
Compare with wing of
Orthoceratium lacustre
Edited by Igor Grichanov on 04-12-2008 08:33
Posted by Klaas on 04-12-2008 10:20
#4
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
Posted by Igor Grichanov on 04-12-2008 16:27
#5
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
Posted by Klaas on 04-12-2008 19:17
#6
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