Posted by paqui on 29-12-2009 00:06
#1
Hello, I´m looking at this genera now and a few doubts come to me,
- I copy the list fron Fauna Europaea:
Chorisops caroli Troiano 1995
Chorisops masoni Troiano & Toscano 1995
Chorisops nagatomii Rozkosny 1979
Chorisops tibialis (Meigen 1820)
Chorisops tunisiae (Becker 1915)
In Spain there are two recorded:
C. tibialis and
C. tunisiae, but I haven´t found any description of
C. tunisiae:
- In "
Lindner" there´s only
C. tibialis, and
C. tunisiae appears as a synonym (outdated, I suppose).
- "
The manual of Palaearctic Diptera" separates
Allognosta from
Beris, Actina and Chorisops because Allognosta has no spinelike processes (scutellum) but the other 3 genera have 48!!, I´ve never seen all those spines, where are they? I link to a photo from the gallery:
http://www.dipter...to_id=3275 perhaps not visible with this angle (?)
- "
Faune de France" has only C. tibialis and doesn´t tell a number of spines
Looking for more Chorisops pictures I´ve seen this one, from Portugal:
http://commons.wi...2008-1.jpg The Portugese records (until 2002) were
C. nagatomi and
C. tunisiae ,
- "
British soldier flies... " covers
C. tibialis and
C. nagatomi (orange abdomen) so perhaps the one from this picture is
C. tunisiae ? This book says Chorisops has 4 spines (or 6 in aberrant specimens), so perhaps "spinelike processes" are smaller or thinner than normal spines (?)
Any help with any of these questions is welcome (where/how are the spines and/or any reference (article) with description of C. tunisiae).
Thank you all very much for your atention
And happy new year :)
Posted by blowave on 29-12-2009 02:15
#2
Hello paqui,
I was interested to find these spines myself as I took pics of both male and female C. tibialis this year. I can see some faint, pale spines on the thorax of the male and it appears the female has some too but they don't show very well at some angles.
I was going to post my pics, but I searched the site and found some which show the spines well. I guess these are the 48 you have read about.
http://diptera.in...post_42064
Janet:)