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Thread: Give us your best shot!

  1. #221
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    Family Araneidae (Orb Weavers)
    The common name comes from the web-spinning behavior of these spiders - they make the classic, round "orb" web that most people associate with spiders.

    Genus Argiope (Original spelling: Argyope) (ar-guy-o-pee rhymes with calliope)
    Possibly from Greek argos - "bright, shiny" or argyros - "silver" + ope , a variant of ops - "eye, face". Some Argiopes are bright and silvery on the top of the cephalothorax ("head").

    Identification
    Large orbweavers that do not have a retreat near their web--usually found in its center. These orbweavers often place a conspicuous zigzagging white silk banner in their webs called the "stabilimentum" (reinforced area) which can be used to identify the species. Juveniles of many species spin a spiralling stabilimentum from the center of the web. The function of the stabilimentum is not fully understood. Hypotheses are: that it stabilizes the web, or makes it more apparent to birds which will thus not fly into and wreck it, or it reflects light to attract insect prey, or perhaps most likely helps to camouflage the spider in the web.

    http://bugguide.net/node/view/2007



    There are two Argiope sp. that I could find as possibly being present in Brazil A. argentata and A. trifasciata.

    A. trifasciata
    Stabilimentum in web makes a vertical zigzag band above and below the middle of the web, similar to that of Argiope aurantia, but less prominent.

    A. argentata
    In this species four stabilimenta form a cross in the web of mature spiders.

    If we ID this by the apparent stabilimentum, this is an example of Argiope argentata.
    Remember color can vary as well as the size of the "bumps" on the abdomen.
    http://bugguide.net/node/view/2033

    Argiope argentata


    Now, why it is called the 'Golden Web Spider'?

    1. The Argiope have various shades of orange/yellow/cream banding their legs.
    http://bugguide.net/node/view/2007

    2. Another species is A. aurantia; that’s the kind I have in my garden here. Aurantia is from the modern Latin word for either "orange" or "gold", which comes from medieval Latin aurantium. Since common names are not standardized, that local species may share the name. (Actually argentata = silvery if that’s the genus to which this gal belongs.)
    http://bugguide.net/node/view/2025

    A. aurantia


    A. argentata

    3. As netsirk poited out, there is another large, web-producing spider (Nephila clavipes) that actually produces strands that are yellow in color. That spider may live in the same area as your specimen.
    http://bugguide.net/node/view/2023/bgimage

    Nephila clavipes

    “Tmcky ymu kra Ymu, tekt fs truar tekl trua. Teara fs lm mla kifva wem fs Ymuar tekl Ymu.” ~ Dr. Seuss

    I love deadlines. I like the whooshing sound they make as they fly by. ~ Douglas Adams

    If you're not part of the solution, you're part of the precipitate. ~ Henry J. Tillman

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  2. #222
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    My guess is that, right about now, Holli is on the floor somewhere...

    SPIDERS!

  3. #223
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    hahahahaha...was thinking the same thing carol!
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  4. #224
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    Did the web have stabilimentum (a thick zig-zag pattern through the center of the web)?
    The picture that I posted is a video capture. I went and looked at the video again, but I didn't get too much more from it. Unfortunately that picture is about as focused as I could get it. From what I read above, I'd say there's a pretty good chance that those are stabilimentum.

    I'd like to award:

    Sluggy - 125T for making a good case for the A. Argentata of the Golden Orb Weavers, and for explaining the stabilimentum, the position of the legs, and the roots of the word, Argiope.

    Netsirk - 100T for the interesting information on the banana spider and their webs.

    Thanks for the help.

    - MP

  5. #225
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    Thanks Mark!!!
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  6. #226
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    Quote Originally Posted by MPowers
    ... for explaining the stabilimentum, the position of the legs, and the roots of the word, Argiope.
    Thanks, buddy!

    I can recognize the critters in the garden but hadn't realized that that posture was an identifier for the genus. I have added the term stabilimentum to my vocabulary; I knew there were designs in the webs but not that there was a special name for them.

    Just throw out a late night biology challenge (even without T$) and I'm there. And the later it gets, the more obsessive the hunt.

    I just received a camera from my parents for Christmas. I'm inspired to get some pics of my ladies when they return at the end of the summer.

    “Tmcky ymu kra Ymu, tekt fs truar tekl trua. Teara fs lm mla kifva wem fs Ymuar tekl Ymu.” ~ Dr. Seuss

    I love deadlines. I like the whooshing sound they make as they fly by. ~ Douglas Adams

    If you're not part of the solution, you're part of the precipitate. ~ Henry J. Tillman

    Some people are lost in the shuffle. I'm shuffling along with the lost.

  7. #227
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    Brazilian spider pics (Argiope argentata)
    Attached Images

    “Tmcky ymu kra Ymu, tekt fs truar tekl trua. Teara fs lm mla kifva wem fs Ymuar tekl Ymu.” ~ Dr. Seuss

    I love deadlines. I like the whooshing sound they make as they fly by. ~ Douglas Adams

    If you're not part of the solution, you're part of the precipitate. ~ Henry J. Tillman

    Some people are lost in the shuffle. I'm shuffling along with the lost.

  8. #228
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    I think the middle picture is closest to where I was geographically.

    BTW, does that top spider look like it's trying to spell something?

  9. #229
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    OK - SPIDERS AND SNAKES!!!!!!!!!!!!!!!!!!

    (except for you spidey)

    That takes care of me. Canceled my trip to Brazil!!!!!!!

    Probably will have a spider nightmare tonight.


    ***********************
    We must be willing to get rid of the life we’ve planned, so as to have the life that is waiting for us.
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    There are three kinds of people : Those who can count and those that can't.




  10. #230
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    They are scaring looking
    but beautiful in their own way....ya know?



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