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Diptera.info :: Identification queries :: Other insects, spiders, etc.
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Unknown webb spider
Alvesgaspar
#1 Print Post
Posted on 15-10-2007 18:38
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Location: Lisbon, Portugal
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I'm even worse with spiders than with insects. Browsing through galleries doesn't help much Pfft. A medium spider found in a wall, about 8mm (without legs).

Thanks for your help,

Joaquim Gaspar
Lisbon
Alvesgaspar attached the following image:


[114.72Kb]
 
Rui Andrade
#2 Print Post
Posted on 15-10-2007 19:18
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Steatoda nobilis (Theridiidae)????
 
www.flickr.com/photos/rui_andrade/
jorgemotalmeida
#3 Print Post
Posted on 15-10-2007 19:52
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Location: Viseu - PORTUGAL
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Yes, alright!! Smile It is a male of Steatoda nobilis (THERIDIIDAE) ! Extremely common this species.
 
http://www.flickr.com/photos/superegnum
Alvesgaspar
#4 Print Post
Posted on 15-10-2007 20:17
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Thank you, Rui and Jorge. How can we see it is a male?...

Joaquim Gaspar
 
Rui Andrade
#5 Print Post
Posted on 15-10-2007 20:29
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Spider's pedipalps are bigger in males, and the female of this species is "fatter" Grin.

Jorge, please translate my language into something more technical.
 
www.flickr.com/photos/rui_andrade/
Isidro
#6 Print Post
Posted on 15-10-2007 21:30
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Location: Zaragoza, Spain
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Is all well said, Rui. The male's pedipalps are broad at the tip. The size of the abdomen isn't a good character for differenciate the sex: females that have been many time without food, can look males! (I found a long time ago, a Lycosa tarentula female with abdomen lesser than prosoma...)
 
Rui Andrade
#7 Print Post
Posted on 15-10-2007 21:36
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Thank you for your important explanation.
 
www.flickr.com/photos/rui_andrade/
jorgemotalmeida
#8 Print Post
Posted on 15-10-2007 22:17
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yep. Swollen palps -> male; not swollen palps > nymph or juvenile or female. Smile And females have usually the epigyne on womb (there are exceptions). The size is not reliable. There are many variations. There are species where the male is much bigger than female.
Edited by jorgemotalmeida on 16-10-2007 08:42
 
http://www.flickr.com/photos/superegnum
Rui Andrade
#9 Print Post
Posted on 15-10-2007 22:34
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This is the language that I was talking about Grin.

Thank you, Jorge.
 
www.flickr.com/photos/rui_andrade/
Isidro
#10 Print Post
Posted on 16-10-2007 06:31
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Location: Zaragoza, Spain
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jorgemotalmeida wrote:
There are species where the male is much bigger than female.


What ones????????????????????????? ShockShockShockShockShockShockShockShock It exist in Europe?? And in Iberian peninsula????
 
jorgemotalmeida
#11 Print Post
Posted on 16-10-2007 08:57
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Argyroneta aquatica! Grin THE ONLY one spider that lives underwater in the wordl (known so far), and one of few cases where the males are bigger than females. You have it in Spain. Go to Girona. Grin I saw once time and I have a crap video in youtube showing it inside water. Smile

http://cat.inist....t=14456961

 
http://www.flickr.com/photos/superegnum
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