  {"id":3821,"date":"2012-11-06T00:00:42","date_gmt":"2012-11-06T06:00:42","guid":{"rendered":"https:\/\/uwm.edu\/field-station\/?p=3821"},"modified":"2017-05-15T20:02:56","modified_gmt":"2017-05-16T01:02:56","slug":"big-orb-weaving-spiders","status":"publish","type":"post","link":"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/big-orb-weaving-spiders\/","title":{"rendered":"Big Orb Weaving Spiders (Family Araneidae)"},"content":{"rendered":"<p>Greetings, BugFans,<\/p>\n<p>The BugLady has been amassing shots of big, showy orb weaving spiders (Charlotte\u2019s relatives) in the spider family Araneidae. FYI, in the course of her research, she has seen the name spelled Orb Weavers, Orb-weavers, and Orbweavers. She thinks she\u2019s ID\u2019d them correctly, but \u201cpicture-keying\u201d has its limits, and there\u2019s a lot of variability within each of these species. If she were smart, she would be satisfied just to get the genus right. The BugLady invites BugFans to visit <a href=\"http:\/\/www.bugguide.net\">bugguide.net<\/a>, type the names of these spiders into the search box, click on \u201cImages\u201d and be blown away by the different colors and patterns of each. The BugLady also recommends <em>Spiders of the North Woods<\/em> by Larry Weber. Whoever they are, aren\u2019t these spiders fine! Here, a bit late for Halloween, is something for Arachnophobes.<\/p>\n<p>Orb Weavers have been practicing their craft for some 140 million years now (full disclosure&mdash;there are some non-OWs that weave orb-type webs). With more than 10,000 kinds of Araneids worldwide, they account for about a quarter of spider species.<\/p>\n<p>Although OWs have eight eyes (two rows of four), their vision is not good. Their legs are adorned with bristles\/spines and with an extra claw on each foot (that third claw helps them to manipulate silk as they spin it and to traverse the non-sticky parts of the web). Females are often considerably bigger than males and have large spherical abdomens. Some species are nocturnal, and others are diurnal.<\/p>\n<p>Building a web is an amazing feat that involves sending a sticky line out into the breezes. If it catches on something, the spider forms the \u201cspokes\u201d of the wheel with non-sticky web and then uses sticky silk for the spiral. It takes about an hour. Some (but not all) diurnal OWs, especially in the genus <em>Argiope<\/em>, weave a heavy \u201czipper\u201d or other pattern called a <em>stabilimentum<\/em> into part of the web. Guesses about the function of the stabilimentum are that it strengthens the web, that it allows the spider to control the tension of the strands in the web, that it gives birds a \u201cvisual\u201d and bats an \u201cecho\u201d that keeps them from flying through the web, that it attracts insects by reflecting UV light, that it makes the rest of the web seem less conspicuous\/more invisible, and that it provides a camouflaged spot for spiders to hang (head down) in the web\u2019s center. Many nocturnal OWs eat their dewy web in the morning and rebuild it at night. Males are not avid web-makers.<\/p>\n<p>OWs will often tackle prey that is larger than they are if it gets snagged in their web. They first paralyze it with a toxic bite, then wrap it, and later eat it. The front two pairs of legs handle the prey and the rear two pairs manipulate the silk. If the prey is a stinging or venomous critter, it\u2019s \u201cwrap first; bite later.\u201d They tenderize it with fluid from their mouth, and then re-ingest their digestive juices as they eat the softened prey.<\/p>\n<p>In the species shown here, Mom places from several hundred to a thousand eggs in one or more spherical egg cases\/cocoons that are hung from the web or hidden in tree bark (that\u2019s what those nuthatches are looking for in winter) or in some other crevice. She guards them until she is, inevitably, killed by the cold (\u201cAnd no one was with her when she died.\u201d <em>Charlotte\u2019s Web<\/em>). Although some species hatch and make their way out of the case before winter, it\u2019s more common for the spiderlings to emerge from the sac in spring. Some species hatch from their eggs in fall but remain within the egg sac, feeding on the yolk inside (and eventually on each other) as winter passes; others don\u2019t hatch until spring. OWs are around for the full spider season, but they don\u2019t really become big enough to be noticeable until mid summer\/early fall.<\/p>\n<h3>Black And Yellow Argiope\/Garden Spider<\/h3>\n<p>The Black And Yellow Argiope\/Garden Spider (<em>Argiope aurantia<\/em>) is a familiar, large (a female\u2019s body may measure an inch-plus) spider that dwells in sunny grasslands, edges, gardens, wetlands and suburbs. <em>Wikipedia<\/em> says its Latin name means \u201cgilded silver-face.\u201d The thick zigzag stabilimentum woven into the web has given Argiopes the nickname \u201cwriting spiders.\u201d Webs are generally built\/repaired at night, and a BYGS will use a productive web site (the original meaning of the term) over and over. BYGS numbers have fallen dramatically and inexplicably in the BugLady\u2019s fields in the past decade.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-black-yellow-argiope12-6rz.jpg\" alt=\"orb-wvr-black-yellow-argiope12-6rz\" width=\"500\" height=\"500\" class=\"aligncenter size-full wp-image-3832\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-black-yellow-argiope12-6rz.jpg 500w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-black-yellow-argiope12-6rz-150x150.jpg 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-black-yellow-argiope12-6rz-300x300.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>She makes several egg cases in fall and attaches them to the sides of the web (safe from ants, but not from birds and parasitic wasps, and not, apparently, from a bevy of inquilines either; researchers have monitored BYGS egg cases and tallied 19 species of insects and 11 species of spider that have emerged from them).<\/p>\n<p>Males are nomadic, looking for romance, but they will make a small web when they find a female. They court by plucking\/vibrating the female\u2019s web (settle down, folks&mdash;the BugLady means this literally), hoping she can differentiate suitor from prey.<\/p>\n<h3>Banded Garden Spider<\/h3>\n<p>Banded Garden Spiders (<em>Argiope trifasciata<\/em>) have become more common in the BugLady\u2019s fields as the BYGS numbers have dwindled; nature does abhor a vacuum. Studies suggest that the webs of BGSs (and those of other diurnal orb-weavers) tend to be oriented east-west, and that the position of the occupant in the center of the north side of the web, \u201cbelly\u201d facing south, maximizes her exposure to solar heating. Although they are as large as those of the BYGS, BGS webs may lack a stabilimentum.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-argiope-banded11-1brz.jpg\" alt=\"orb-wvr-argiope-banded11-1brz\" width=\"500\" height=\"500\" class=\"aligncenter size-full wp-image-3833\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-argiope-banded11-1brz.jpg 500w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-argiope-banded11-1brz-150x150.jpg 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-argiope-banded11-1brz-300x300.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h3>Shamrock Orbweaver<\/h3>\n<p>The Shamrock Orbweaver (<em>Araneus trifolium<\/em>), is also called the Pumpkin spider. One source compared the spider\u2019s plump abdomen to the shape of a pumpkin; another attributed the name to the fact that SOs are out and about around Halloween. The family Araneidae is the third-largest spider family worldwide, and the genus <em>Araneus<\/em> is the largest spider genus, with 1,500 species known globally.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-shamrock08-9rz.jpg\" alt=\"orb-wvr-shamrock08-9rz\" width=\"500\" height=\"500\" class=\"aligncenter size-full wp-image-3834\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-shamrock08-9rz.jpg 500w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-shamrock08-9rz-150x150.jpg 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-shamrock08-9rz-300x300.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h3>Marbled Orbweaver<\/h3>\n<p>The BugLady sees Marbled Orbweavers (<em>Araneus marmoreus<\/em>) on the forest floor on distinctly cool days in early November, challenging the limits of cold-bloodedness. Adults spin a web and then wait, concealed in a silken hiding place, monitoring vibrations via a \u201csignal strand\u201d attached to the web. When an insect gets caught in the web, the MO will \u201cprocess\u201d it and carry it to its hiding place to eat it.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-marbled12-7rz.jpg\" alt=\"orb-wvr-marbled12-7rz\" width=\"630\" height=\"450\" class=\"aligncenter size-full wp-image-3835\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-marbled12-7rz.jpg 630w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-marbled12-7rz-300x214.jpg 300w\" sizes=\"auto, (max-width: 630px) 100vw, 630px\" \/><\/p>\n<h3>Cross Orbweaver<\/h3>\n<p>The Cross Orbweaver (<em>Araneus diadematus<\/em>) is an alien spider who, like the Bridge spider of recent BOTW fame, immigrated to our shores from Europe (it\u2019s also called the European garden spider and the Diadem spider). Like the bridge spider, it likes to hang out on buildings, especially on walls with exterior lights.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-cross09-1rz.jpg\" alt=\"orb-wvr-cross09-1rz\" width=\"500\" height=\"500\" class=\"aligncenter size-full wp-image-3836\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-cross09-1rz.jpg 500w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-cross09-1rz-150x150.jpg 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-cross09-1rz-300x300.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h3>Arabesque Orbweaver<\/h3>\n<p>The BugLady is calling this shy creature an <strong>Arabesque Orbweaver<\/strong> (<em>Neoscona arabesca<\/em>) because of the pairs of slanted, dark lines on the abdomen. Spiders in the genus <em>Neoscona<\/em> are called \u201cSpotted Orb Weavers.\u201d According to <a href=\"http:\/\/www.bugguide.net\">bugguide.net<\/a>, the AO \u201cstays in a retreat (usually a curled up leaf) to the side of the web during the day. At night it rests in the center of the web with the tip of the abdomen pushed through the open space in the center of the web.\u201d<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-arabesque09-15rz.jpg\" alt=\"orb-wvr-arabesque09-15rz\" width=\"500\" height=\"500\" class=\"aligncenter size-full wp-image-3837\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-arabesque09-15rz.jpg 500w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-arabesque09-15rz-150x150.jpg 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-arabesque09-15rz-300x300.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Although they have the right equipment to bite you, an orb weavers\u2019 favorite strategy is avoidance. If you insist on man-handling one, it will defend itself appropriately.<\/p>\n<p>&nbsp;<br \/>\n<em>The Bug Lady<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p><strong>Orb Weaver Spiders<\/strong> have been practicing their craft for some 140 million years. With more than 10,000 kinds of Araneids worldwide, they account for about a quarter of spider species. OWs will often tackle prey that is larger than they are if it gets snagged in their web. They first paralyze it with a toxic bite, then wrap it, and later eat it. <\/p>\n","protected":false},"author":845,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","uwm_wg_additional_authors":[]},"categories":[8],"tags":[31],"class_list":["post-3821","post","type-post","status-publish","format-standard","hentry","category-bug-of-the-week","tag-spiders"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Field Station<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/big-orb-weaving-spiders\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Big Orb Weaving Spiders (Family Araneidae)\" \/>\n<meta property=\"og:description\" content=\"Orb Weaver Spiders have been practicing their craft for some 140 million years. With more than 10,000 kinds of Araneids worldwide, they account for about a quarter of spider species. OWs will often tackle prey that is larger than they are if it gets snagged in their web. They first paralyze it with a toxic bite, then wrap it, and later eat it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/big-orb-weaving-spiders\/\" \/>\n<meta property=\"og:site_name\" content=\"Field Station\" \/>\n<meta property=\"article:published_time\" content=\"2012-11-06T06:00:42+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2017-05-16T01:02:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2012\/11\/orb-wvr-black-yellow-argiope12-6rz.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/big-orb-weaving-spiders\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/big-orb-weaving-spiders\\\/\"},\"author\":{\"name\":\"\",\"@id\":\"\"},\"headline\":\"Big Orb Weaving Spiders (Family Araneidae)\",\"datePublished\":\"2012-11-06T06:00:42+00:00\",\"dateModified\":\"2017-05-16T01:02:56+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/big-orb-weaving-spiders\\\/\"},\"wordCount\":1270,\"image\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/big-orb-weaving-spiders\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/wp-content\\\/uploads\\\/sites\\\/380\\\/2012\\\/11\\\/orb-wvr-black-yellow-argiope12-6rz.jpg\",\"keywords\":[\"Spiders\"],\"articleSection\":[\"Bug of the Week\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/big-orb-weaving-spiders\\\/\",\"url\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/big-orb-weaving-spiders\\\/\",\"name\":\"Big Orb Weaving Spiders (Family Araneidae) - 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