Author Topic: Something to watch for?? (Tenuiphantes zibus?)  (Read 4196 times)

Offline Kevin Pfeiffer

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Something to watch for?? (Tenuiphantes zibus?)
« on: October 03, 2011, 09:23:49 AM »
Here is a Lepthyphantes/Tenuiphantes species found in Washington (northwestern USA) that tripped us up...
http://bugguide.net/node/view/581929

Epigynum (180 deg. rotated): http://bugguide.net/node/view/581941
Coloration: http://bugguide.net/node/view/581939

Based on the images, a couple of us assumed that it must be the introduced species T. tenuis. But it turns out there are a couple local species that are very similar. Rod Crawford corrected us and said that this is T. zibus (Zorsch, 1937). The female has never been described; he shared a rough sketch of the epigyne with me and it's quite similar in appearance to T. tenuis. But, he writes:

The color difference is pretty obvious, between the 3 species in this group common in western Washington.

zibus    --  carapace all straw-color with no dusky except around
               eyes and rim. Abdomen venter largely light yellowish
tenuis   -- carapace darker with at least some dusky in most parts.
               Abdomen venter largely medium to dark brown.
zelatus --  carapace 100% very dark brown, abdomen venter black


I mention this because it seems there is often an overlap in the Linyphiidae between the Scandinavian region and the northerly Nearctic (Canada, northern US, etc.).

-K
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Offline Kjetil Åkra

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Re: Something to watch for?? (Tenuiphantes zibus?)
« Reply #1 on: October 03, 2011, 11:21:57 AM »
Interesting, Kevin. Thanks for posting. We´ll keep our eyes open!

Kjetil
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Offline Glenn H. Morka

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Re: Something to watch for?? (Tenuiphantes zibus?)
« Reply #2 on: October 03, 2011, 01:40:39 PM »
Interesting!

I see solid difference in the epigyne, compared to T. tenuis.


-Glenn
"Sykemeldt"



Offline Kevin Pfeiffer

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Re: Something to watch for?? (Tenuiphantes zibus?)
« Reply #3 on: October 03, 2011, 04:27:19 PM »
Interesting!

I see solid difference in the epigyne, compared to T. tenuis.

Okay, I guess you have looked at more of these (T. t.) than I have.

-K
Jeg bruker Googles språkoversettelsesverktøy, fra norsk til engelsk.
Takker for forståelse. Med beste ønsker, Kevin (Berlin, Tyskland).

Offline Glenn H. Morka

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Re: Something to watch for?? (Tenuiphantes zibus?)
« Reply #4 on: October 03, 2011, 10:37:42 PM »
Interesting!

I see solid difference in the epigyne, compared to T. tenuis.

Okay, I guess you have looked at more of these (T. t.) than I have.

-K


Yes I`ve seen many T. tenuis. It has been a big help in seeing all the variations in the epigynes of one single specie.

-Glenn
"Sykemeldt"