Thread subject: Diptera.info :: Tetanocera ferruginea, Sciomyzidae, Hungary

Posted by Xespok on 26-07-2006 16:54
#1

I do not have a lateral image here, so I am puzzled whether this is a Sciomyzidae, a Suillia or maybe some Scathophagidae.

Edited by Xespok on 11-11-2006 13:31

Posted by Nikita Vikhrev on 26-07-2006 17:18
#2

Sciomyzidae. I think Tetanocera.

Posted by Paul Beuk on 26-07-2006 19:23
#3

Judging from the setae on the legs, the way the glossy and matt parts of the froms are distributed and the soze of the dark brown patch on the back of the head I would say T. freyi. Anyone another suggestion?

Posted by Xespok on 29-07-2006 21:43
#4

Thx, Paul I put this down as T. cf freyi, because this species is not supposed to occur in Hungary based on the fauaneur.org database, but this family is little studied in Hungary.

Species recorded here are: arrogans, elata, ferruginea, fuscinervis, hyalipennis, montana, punctifrons, robusta and silvatica.

Edited by Xespok on 29-07-2006 21:53

Posted by Nikita Vikhrev on 06-11-2006 21:42
#5

Posterior setas on f2 and f3 absent - not arrogans, montana, punctifrons, robusta.
Frons not completely shining - not hyalipennis.
Anterior margin of frons shining - not elata, ferruginea, fuscinervis.
Either frey or silvatica.
But on your image is clearly visible that brown part of occipital spot is subtriangular which divides T. sylvatica from T. frey.
So, Tetanocera sylvatica.

Posted by Xespok on 07-11-2006 11:30
#6

Thx Nikita, I'll have some more Sciomyzidae images for you :)

Posted by Kahis on 07-11-2006 11:42
#7

Sorry, ut I have to disagree. I don't think the anterior margin of frons is shining. The frontal stripe is shing and runs to the anterior margin, but there is no shining transvarse band at the anterior margin, only a brown band.

Posted by Nikita Vikhrev on 07-11-2006 15:02
#8

I can't neither agree nor disagree with Kahis. My test - this damned frons shining/not shining is very doubtfull feature. I choised T. sylvatica mostly because Paul chiosed T. frey, a very similar species to T.sylvatica (both with frons anteriory shining).
But still, it is not common image with visible posterior sides of f2 and f3, which permits to exclude arrogans, montana, punctifrons, robusta.
Frons not completely shining - not hyalipennis.
Wings without dark costal margin - not elata.
So, choise between ferruginea, fuscinervis and silvatica, or if exclude sylvatica - ferruginea, fuscinervis.
Ok, let us regard ferruginea and fuscinervis. It leads us to contradicted results, I think. According your description, Jere - frontal stripe "linear and shining" - ferruginea. But t3 with only one apical seta - fuscinervis.
Well, it is good image and good illustration why there isn't any Tetanocera in our Gallery:o
Nikita


Posted by Kahis on 07-11-2006 15:41
#9

Having checked some keys I definitely think it is T. ferruginea.

The apical setae are rather variable and many ferruginea (checked from genitalis) have only one strong preapical. The frontal stripe is very different in fuscinervis. One good (but not 100% reliable) character is the number of ad setae on hind femur: 3-4 in ferruginea, 2 in fuscinervis.

The frons shining/not shining is very easy to use use you have seen the various forms.

Posted by Nikita Vikhrev on 07-11-2006 16:01
#10

Thank you Kahis.

Posted by Xespok on 11-11-2006 13:30
#11

Kahis, thx for your expert opinion.

I tried to key this species, but I was lost how tho interpret this shiny thing on the frons. Obviously this is one of those characteristics, which are easy if you know several species already.