Diptera.info

Posted by Justafly on 27-11-2018 11:45

Creto, Genova, 1014-07-19

... and the species?

Thank you for any your comment.;)

Posted by Piluca_Alvarez on 27-11-2018 18:47

Reminds me a lot of Dioctria bicincta... but cannot see all features well (I miss a proper view of the antennae) so I might be wrong. Better wait for Reinoud. In any case, this is a species I am not familiar with.

Posted by Justafly on 28-11-2018 10:36

Here you are another photo. May be it could be more useful.

Thank you in any case.:):):)

Posted by Piluca_Alvarez on 29-11-2018 23:18

Thanks for the new picture! :)

Pity that I don't see the length of the second antennal segment clearly enough... But still, if I forget about this feature, still the rest fits Dioctria bicincta nicely :) I have just checked and it is present in Italy so, that is a good sign ;)

Posted by Quaedfliegh on 29-11-2018 23:52

You could well be right Piluca, but the hind meta tarsi seem a bit narrow for the species which would point at D. gracilis. A tough one to ID

Posted by Piluca_Alvarez on 30-11-2018 12:28

Thanks, Reinoud! :) Good thing you are always around! ;)

Dioctria keeps confusing me :@

Sorry for the mistake, Justafly :| But I thought females of bicincta and gracilis are very difficult to separate and D. gracilis appears in Fauna Europaea as doubtly present in all countries were it was previously cited. And bicincta is present in Italy so I assumed it had to be that one. Too much assuming on my part, sorry.

Posted by Justafly on 30-11-2018 13:35

Moreover we should consider that Dioctria gracilis in Italy appears present (with a question mark) only in Sardinia!

Cfr. http://www.faunaitalia.it/checklist/invertebrates/families/Asilidae.html

Ciao to everybody

Posted by Quaedfliegh on 30-11-2018 21:51

According to Engel the two species are very difficult to separate and also FGG says that the females can not be separated in his online key. This is a female...... :-) As D. gracilis is only known from Sardinia, this may well be D. bincincta, Piluca is right! Although D. gracilis is also known from France.... The doubtful presence seems to mean that someone doubts D. gracilis as a valid species. Otherwise the species wouldn't occur anywhere and would be non existant.