Thread subject: Diptera.info :: Amaurobius sp. Mk.2<A.similis ID by Juergen Peters

Posted by Roger Thomason on 12-03-2009 03:23
#1

This big old bearded lady was found behind a plant pot holding an artificial tree (how naff is that), in the Crew Room (Fixed Wing),@ Scatsta Airport. Is that too much information?
She is approx 12mm in length,(Beard to Butt). Which species this time?
No Air Hostesses were involved during filming of this Spider..:|..which is a shame.

Edited by Roger Thomason on 13-03-2009 11:31

Posted by Juergen Peters on 12-03-2009 21:17
#2

Hello, Roger!

Now that there seem to come no new opinions on the other one in the spider forum :|, I will make a decision B): This (and the other one) is with a certainty of 99% Amaurobius similis.

Reasons:
1.) A. ferox can be safely excluded from colouration and general impression/habitus,
2.) A. fenestralis very seldom inhabitats buildings, it is (at least here) mostly found in forests behind bark, in quarries etc.,
3.) A. fenestralis ist more reddish (again: at least here) and considerably smaller (never reaches 12 mm, mostly 6-8 mm) and more delicate,
4.) A. similis ist a mostly west european species, which reaches its eastern distribution border here in northwest Germany; contrarily A. similis is much more abundant in Britain, and I assume on the Shetlands, too.

So all facts count for A. similis, but we can't be 100% sure...

Posted by Roger Thomason on 13-03-2009 11:28
#3

Hi Juergen
I can live with 99% sure....only death is 100% sure. I don't suppose the sky will fall if I put A. similis to this spider. Yes I saw the other Website....translated the reply by GLOBAL MODERATOR Arno Grabolle (Great Title/Name)...worth a try though.
Regards Roger