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#1 2014-11-13 00:42:38

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 114

Tachydromia aemula/arrogans

I would be grateful if someone could tell me what the diagnostic differences are between these two species of hybotid. 
Regards, Rob

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#2 2014-11-13 12:35:42

brianh
DF Members
Name: Brian Harding
From: Kidlington, Oxfordshire
Registered: 2008-10-27
Posts: 326

Re: Tachydromia aemula/arrogans

In the Scandinavian keys the couplet is:-
Wings longer and blunter at tip, vein R2+3 sharply upturned towards costa. Hind femora all black, and posterior coxae yellow at tip. Occiput grey dusted along postocular margins.  T. arrogans.
Wings smaller and very pointed, vein R2+3 moreevenly upturned towards costa. Hind femora yellow at base and posterior coxae mostly yellow, darker at base. Occiput polished along postocular margins.  T. aemula

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#3 2014-11-13 12:47:50

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 114

Re: Tachydromia aemula/arrogans

Hello Brian.  Many thanks for this.  My specimen is clearly aemula.  Best wishes, Rob

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#4 2014-11-13 12:58:39

brianh
DF Members
Name: Brian Harding
From: Kidlington, Oxfordshire
Registered: 2008-10-27
Posts: 326

Re: Tachydromia aemula/arrogans

Further to my previous reply I note that in Collin's keys it is named as Sicodus rather than Tachydromia, which is why I went to the Scandinavian keys. In Collin's keys arrogans is named as the species with two forms - arrogans and aemula. Arrogans is the common European form with aemula known only from females in two locations. Aemula is the common form in Britain.

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#5 2014-11-13 13:05:54

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 114

Re: Tachydromia aemula/arrogans

Thanks for this further information, Brian.  I was using the Collin's key but as you say the species were not split then and the characters he gives are not as good as the ones you have provided.  I noted from the NBN, though, that there are numerous records of arrogans in GB.  Perhaps they are all old records, or maybe the species is more common here than Collins though.  Best wishes, Rob

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#6 2014-11-13 17:30:39

conopid
DF Members
Name: Nigel Jones
From: Shrewsbury
Registered: 2008-02-27
Posts: 703
Website

Re: Tachydromia aemula/arrogans

Rob for future specimens, Adrian Plant (Empid Rec Scheme organiser) produced a nice key to Tachyydromia. Might be worth asking him for copy if he still has it?


Nigel Jones
Shropshire

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#7 2014-11-13 19:24:06

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 114

Re: Tachydromia aemula/arrogans

Thanks, Nigel.  I'll do that!  Best wishes, Rob

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#8 2014-11-13 23:52:52

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 114

Re: Tachydromia aemula/arrogans

Adrian Plant has just pointed out to me that the Tachydromia key is actually on this site!  Go to Forums, then Recording Schemes, then Empids and Dollies.  Rob

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