Thread subject: Diptera.info :: Pherbellia albicarpa (Rond.)
Posted by David Gibbs on 13-04-2011 17:47
#1
Attached is photo of genitalia of a
Pherbellia from Mallorca. Of the species i know have already recorded from the island i can rule out all but
P. pallidicarpa.
Using Rozkosny 1984 FES this specimen runs to
alpina, ie mesopleuron bare, mid frontal stripe long and tapering and katepisternum with hairs only, no setae.
Edited by David Gibbs on 14-04-2011 19:15
Posted by Paul Beuk on 14-04-2011 11:39
#2
Based on Roskosny's Palaeartcic review I can rule out
pallidicarpa, too. The key in that book differs from the FES key so I cannot get anywhere with a pictuer of the actual specimen.
Posted by David Gibbs on 14-04-2011 14:49
#3
Thank you Paul for having a go, Unfortunately I have been unable to get hold of Rozkosny's review. I thought the very characteristic anterior gonostylus of this specimen would render it easily identifiable, but perhaps this is an undescribed species?
Posted by Paul Beuk on 14-04-2011 15:09
#4
It is possible. I think there have been a few descriptions of
Pherbellia's after the review but dunno whether these include any from that area.
Posted by Nikita Vikhrev on 14-04-2011 16:49
#5
I have 2 speciemens of Ph. alpina, it is uncommon species and may be collected high in the mountain or far at North, it may be not regarded as possible species for Mallorca.
Posted by Paul Beuk on 14-04-2011 17:33
#6
The gonostyli have pointed narrow hook-like extensions neat the base, which are not directed towards the tip.
Pherbellia alpina does not have these extensions, according to the figures in Rozkosny's 1991 key. The illustration in that key for
albicarpa has a closer resemblance but Rozkosny's figure shows two shorter extensions...
Rozkosny, R., 1991. A key to the Palaearctic species of
Pherbellia Robineau-Desvoidy, with descriptions of three new species (Diptera, Sciomyzidae). -
Acta Entomologica Bohemoslovaca 88: 391-406.
Posted by David Gibbs on 14-04-2011 17:57
#7
The suggestion of
P. albicarpa is interesting as my specimens have distinctly whitish front basitarsi. My photo shows the shape of the anterior part of the gonostylus well, there is just a single, long, posteriorly directed hook on the inner margin of the anterior part of the gonostylus.
Posted by Paul Beuk on 14-04-2011 18:22
#8
Interestingly enough, I just checked the key and it states "anterior part of the gonostylus with
1-2 pointed processes at base".
Posted by Stephane Lebrun on 14-04-2011 19:13
#9
In Vala and in Rivosecchi's books, the more approaching genitalia is also P. albicarpa one, though not exactly similar, and always represented with a double thooth-like process instead the single long one on gs. I don't know if it can help but Vala says :
"Gonostyle antérieur courbé en forme de C, avec une structure lamellaire à 2 pointes à la base, l'extrémité distale couverte de fines soies"
Rivosecchi says about the same thing :
"La porzione anteriore dei gonostili è invece assottigliata distalmente, ricurva e con due grossi denti al margine interno."
, and describes the posterior part of gs as being characteristic by its globose-subtriangular shape and provided with robust black spines in the postero-internal part.
Posted by David Gibbs on 14-04-2011 19:14
#10
Nikita has kindly sent me a copy of the key and they run nicely to
P. albicarpa, so unless someone knows of a closely similar species, i think that is them identified
thanks for your help