Thread subject: Diptera.info :: Heleomyzidae > Orbellia (myiopiformis?)

Posted by Raimo on 06-12-2023 15:58
#1
Mid Sweden January 10.
Edited by Raimo on 18-12-2023 20:45

Posted by Raimo on 06-12-2023 15:58
#2
.

Posted by John Carr on 06-12-2023 16:50
#3
Orbellia

Posted by Raimo on 18-12-2023 19:55
#4
Thanks John. We seems to have only two species in Sweden: myiopiformis and nivicola.

Posted by John Carr on 18-12-2023 20:33
#5
The key in Die Fliegen (1949) says

1. Taster schwarz ... hiemalis Loew.
— Taster rotgelb ... 2
2. Abdomen und p rotgelb, 6 Schildchenborsten ... myiopiformis Rob.-Desv.
— Abdomen und p schwarzgrau, 4 Schildchenborsten ... cuniculorum Rob.-Desv.

So it keys to Orbellia myiopiformis. The description says "Schulterbeulen rotgelb", "humeri reddish yellow", which I don't see. I have observed in Dolichopus that humeri can appear yellowish under a microscope but black to a camera.

Edit: But nivicola is not in that key, so you need better literature. It was considered a synonym of O. myiopiformis.
Edited by John Carr on 18-12-2023 20:35

Posted by Raimo on 18-12-2023 20:39
#6
Thankyou John. I better keep it safe and call it a possible Orbellia myiopiformis then.

Posted by Andrzej on 18-12-2023 22:35
#7
... and in Gorodkov (1989) we have a key to both mentioned species...
Edited by Andrzej on 18-12-2023 22:37

Posted by Raimo on 20-12-2023 19:04
#8
Ok Andrzej, then it points to nivicola. It was not a small fly.