  {"id":15966,"date":"2025-02-19T10:48:50","date_gmt":"2025-02-19T16:48:50","guid":{"rendered":"https:\/\/uwm.edu\/field-station\/?p=15966"},"modified":"2025-02-19T10:58:35","modified_gmt":"2025-02-19T16:58:35","slug":"ground-crab-spiders","status":"publish","type":"post","link":"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/ground-crab-spiders\/","title":{"rendered":"Ground Crab Spiders"},"content":{"rendered":"\n<p class=\"size-p-sm\">Note: All links are to external sites.<\/p>\n\n\n\n<p>Howdy, BugFans,<\/p>\n\n\n\n<p>Crab spiders need no introduction to these pages &#8211; several genera of delicate, flower crab spiders<\/p>\n\n\n\n<p><a href=\"https:\/\/nam02.safelinks.protection.outlook.com\/?url=https%3A%2F%2Fbugguide.net%2Fnode%2Fview%2F621778%2Fbgpage&amp;data=05%7C02%7Cmsambari%40uwm.edu%7C0369f034e9ec40d4d27108dd50a57f4f%7C0bca7ac3fcb64efd89eb6de97603cf21%7C0%7C0%7C638755393981833609%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&amp;sdata=MFCqv3ZhS4wJzl9Pf4p6ArbzoUNSF0WIGKpv%2FlHA7Hs%3D&amp;reserved=0\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/bugguide.net\/node\/view\/621778\/bgpage<\/a>,<\/p>\n\n\n\n<p><a href=\"https:\/\/nam02.safelinks.protection.outlook.com\/?url=https%3A%2F%2Fbugguide.net%2Fnode%2Fview%2F3928%2Fbgpage&amp;data=05%7C02%7Cmsambari%40uwm.edu%7C0369f034e9ec40d4d27108dd50a57f4f%7C0bca7ac3fcb64efd89eb6de97603cf21%7C0%7C0%7C638755393981859476%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&amp;sdata=NsaBeweloJB4oflohgdu2ILSAAInUgjVH1qHNw7IsP0%3D&amp;reserved=0\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/bugguide.net\/node\/view\/3928\/bgpage<\/a>,<\/p>\n\n\n\n<p><a href=\"https:\/\/nam02.safelinks.protection.outlook.com\/?url=https%3A%2F%2Fbugguide.net%2Fnode%2Fview%2F2201967%2Fbgimage&amp;data=05%7C02%7Cmsambari%40uwm.edu%7C0369f034e9ec40d4d27108dd50a57f4f%7C0bca7ac3fcb64efd89eb6de97603cf21%7C0%7C0%7C638755393981871122%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&amp;sdata=gvg7evaNdGZ77EauGadrxjm5T6jhDJn23qeV4V5PKxU%3D&amp;reserved=0\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/bugguide.net\/node\/view\/2201967\/bgimage<\/a><\/p>\n\n\n\n<p>have appeared in previous episodes.\u00a0\u00a0<\/p>\n\n\n\n<p>Well, maybe a quick review:&nbsp;<\/p>\n\n\n\n<p>They are in the family Thomisidae, which has about 130 species in nine genera in North America (14 genera worldwide). The coolest genus that the BugLady has seen is the genus&nbsp;<em>Tmarus<\/em>, which can <a href=\"https:\/\/bugguide.net\/node\/view\/1238420\/bgimage\">look like tiny octopi<\/a>. &nbsp;<\/p>\n\n\n\n<p>Crab spiders do not spin trap webs; they are ambush hunters that lurk on flowers, leaves, or bark, or in leaf litter, waiting for their prey &#8211; insects and other spiders \u2013 to appear.&nbsp;They get their name from their ability to walk sideways and backwards using just their four back legs and, of course, from their two pairs of long, thick front legs (the name \u201ccrab spider&#8221; is shared with several unrelated, crab-like spiders).&nbsp;<a href=\"https:\/\/bugguide.net\/node\/view\/306006\/bgimage\">They have eight eyes<\/a>, and in some species, the eyes are on tubercles. Their wide, flat bodies are generally less than a half-inch long, and some species can (slowly) change color from white to yellow and back.&nbsp;&nbsp;&nbsp;<\/p>\n\n\n\n<p>Although they don\u2019t spin trap webs, they do spin silk for reproductive purposes and as drag lines when they launch themselves at prey on a flower top.&nbsp;<\/p>\n\n\n\n<p>There are sixty-seven species of GROUND CRAB SPIDERS, genus&nbsp;<em>Xysticus<\/em>, in North America.&nbsp;Most come in earth tones, and many have a disruptive pattern on their abdomen that helps to camouflage them.&nbsp;Contrary to the name \u201cGround crab spider,\u201d they can be found on leaves, stems, and flowers as well as on the ground, on rocks, and on rotting logs.&nbsp;<\/p>\n\n\n\n<figure class=\"alignleft uwm-c-img--left\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/02\/crab-spider-xysticus-elegans16-2-300x300.webp\" alt=\"Xysticus\" class=\"wp-image-15969\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/02\/crab-spider-xysticus-elegans16-2-300x300.webp 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/02\/crab-spider-xysticus-elegans16-2-150x150.webp 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/02\/crab-spider-xysticus-elegans16-2.webp 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n<p>The BugLady has a file of&nbsp;<em>Xysticus<\/em>-like spiders, but (alas), there are several similar genera like&nbsp;<em>Bassaniana<\/em>&nbsp;(the Bark crab spiders) and&nbsp;<em>Ozyptila<\/em>&nbsp;(sometimes called the Leaf litter crab spiders), that, along with the Ground crab spiders are more, well, muscular-looking, and that can be tricky to tell apart without looking at the \u201cnaughty-bits. <em>Xysticus<\/em>&nbsp;also has three or four pairs of macrosetae (large, hairlike projections) on its front legs and a more domed&nbsp;<em>carapace<\/em>&nbsp;(the covering of the front portion of the spider \u2013 the cephalothorax).<\/p>\n\n\n\n<p>They don\u2019t make trap webs, and they don\u2019t wrap their prey before eating it, either.&nbsp;They station themselves where there\u2019s a lot of \u201ctraffic,\u201d grab small invertebrates that get too close, subdue them by wrapping their long, front legs around them, and then kill them with a venomous bite and consume the innards.&nbsp;They\u2019re eaten by birds, reptiles, and small mammals that forage on tree trunks or on the ground.&nbsp;<\/p>\n\n\n\n<p>Not many sources took a deep dive into their natural history, and the accounts were a bit contradictory. Some lumped them in the generalized Crab spider pattern of eggs\/spiderlings staying in the egg sac all winter, emerging in spring, and maturing in summer.&nbsp;Other sources said that the young overwinter as almost-mature spiderlings and that&nbsp;<em>Xysticus<\/em>&nbsp;spiders have been seen trekking across snow on warm days in winter.&nbsp;Boy meets girl in summer and he immobilizes her with silk to ensure her cooperation.&nbsp;He is small and she is large, and she has no trouble slipping her bonds when he leaves.&nbsp;She will continue to create egg sacs, sometimes <a href=\"https:\/\/bugguide.net\/node\/view\/2372239\/bgimage\">folding a leaf around the sac and webbing it partly shut to conceal it<\/a>, until she dies in fall\u2019s first freezes.&nbsp; The total life span is about a year in northern climes.<\/p>\n\n\n\n<figure class=\"alignright uwm-c-img--right\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/02\/crab-spider-x-species-e17-8-300x300.webp\" alt=\"Specie of crab spider\" class=\"wp-image-15968\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/02\/crab-spider-x-species-e17-8-300x300.webp 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/02\/crab-spider-x-species-e17-8-150x150.webp 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/02\/crab-spider-x-species-e17-8.webp 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n<p>Like many kinds of spiders, male Ground crab spiders are smaller and more angular than females, with noticeably slimmer abdomens (sexual dimorphism), and they have large pedipalps (the segmented, sensory mouthpart-like appendages) that <a href=\"https:\/\/bugguide.net\/node\/view\/1959514\/bgimage\">look like boxing gloves<\/a>. Larger females can catch larger prey, and so consume the extra nutrients needed to make eggs. There are several hypotheses about the size difference.&nbsp;First, females may be larger because they produce eggs, and larger females tend to produce more and healthier offspring, but large size is not an advantage for the males.&nbsp;Another idea called \u201cmale dwarfism\u201d says that smaller males can get around more easily and have a better chance of finding a female.&nbsp;Still another hypothesis says that the size difference was a chance development and there\u2019s no particular advantage to being either large or small.<\/p>\n\n\n\n<p>Thanks, as always, to BugFan Mike for his spider advice.&nbsp;<\/p>\n\n\n\n<p><em>The BugLady<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Note: All links are to external sites. Howdy, BugFans, Crab spiders need no introduction to these pages &#8211; several genera of delicate, flower crab spiders https:\/\/bugguide.net\/node\/view\/621778\/bgpage, https:\/\/bugguide.net\/node\/view\/3928\/bgpage, https:\/\/bugguide.net\/node\/view\/2201967\/bgimage have appeared in previous episodes.\u00a0\u00a0 Well, maybe a quick review:&nbsp; They are &hellip;<\/p>\n","protected":false},"author":38860,"featured_media":15967,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","uwm_wg_additional_authors":[]},"categories":[8],"tags":[701,545,900],"class_list":["post-15966","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bug-of-the-week","tag-crab-spider","tag-spider","tag-xysticus"],"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\/ground-crab-spiders\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ground Crab Spiders\" \/>\n<meta property=\"og:description\" content=\"Note: All links are to external sites. Howdy, BugFans, Crab spiders need no introduction to these pages &#8211; several genera of delicate, flower crab spiders https:\/\/bugguide.net\/node\/view\/621778\/bgpage, https:\/\/bugguide.net\/node\/view\/3928\/bgpage, https:\/\/bugguide.net\/node\/view\/2201967\/bgimage have appeared in previous episodes.\u00a0\u00a0 Well, maybe a quick review:&nbsp; They are &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/ground-crab-spiders\/\" \/>\n<meta property=\"og:site_name\" content=\"Field Station\" \/>\n<meta property=\"article:published_time\" content=\"2025-02-19T16:48:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-02-19T16:58:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2025\/02\/crab-spider-Xysticus11-2.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"400\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Meenakshi Pundarikam Sambari\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Meenakshi Pundarikam Sambari\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 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\\\/ground-crab-spiders\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/ground-crab-spiders\\\/\"},\"author\":{\"name\":\"Meenakshi Pundarikam Sambari\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/#\\\/schema\\\/person\\\/ed4191bd459164022b8d3123e795ba86\"},\"headline\":\"Ground Crab Spiders\",\"datePublished\":\"2025-02-19T16:48:50+00:00\",\"dateModified\":\"2025-02-19T16:58:35+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/ground-crab-spiders\\\/\"},\"wordCount\":778,\"image\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/ground-crab-spiders\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/wp-content\\\/uploads\\\/sites\\\/380\\\/2025\\\/02\\\/crab-spider-Xysticus11-2.webp\",\"keywords\":[\"crab spider\",\"spider\",\"Xysticus\"],\"articleSection\":[\"Bug of the Week\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/ground-crab-spiders\\\/\",\"url\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/ground-crab-spiders\\\/\",\"name\":\"Ground Crab Spiders - 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