  {"id":2584,"date":"2014-06-17T15:45:33","date_gmt":"2014-06-17T20:45:33","guid":{"rendered":"https:\/\/uwm.edu\/field-station\/?p=2584"},"modified":"2023-11-28T11:45:30","modified_gmt":"2023-11-28T17:45:30","slug":"forked-fungus-beetle","status":"publish","type":"post","link":"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/forked-fungus-beetle\/","title":{"rendered":"Forked Fungus Beetle (Family Tenebrionidae)"},"content":{"rendered":"\n<p>Howdy, BugFans,<\/p>\n\n\n\n<p>Every once in a while, life hands you a special treat. Late one recent afternoon, the BugLady was walking through the beech woods, moving far too slowly, considering the size of her mosquito escort, scanning a fallen log that was adorned with a few deteriorating shelf fungi (can you spell bug-nerd?). Suddenly, part of a fungus twitched.<\/p>\n\n\n\n<p>If you\u2019re singing along, we\u2019re on page 192 of your <em>Kaufman Field Guide to Insects of North America<\/em> or page 583 of the <em>Audubon Society Field Guide to North American Insects and Spiders<\/em>\u2014the forked\/horned fungus beetle (<em>Bolitotherus cornutus<\/em>) &#8220;crowned&#8221;. The FFB is in the Darkling beetle family Tenebrionidae and is the only species in its genus. It\u2019s found east of the Mississippi, at night, in the woods, in the company of woody, polypore shelf fungi.<\/p>\n\n\n\n<div class=\"uwm-l-row\">\n<div class=\"uwm-l-col\">\n<figure class=\"\"><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m14-2.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"214\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m14-2-300x214.jpg\" alt=\"bolitotherus\" class=\"wp-image-14480\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m14-2-300x214.jpg 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m14-2-768x549.jpg 768w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m14-2.jpg 854w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"uwm-l-col\">\n<figure class=\"\"><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m14-1a.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"722\" height=\"516\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m14-1a.jpg\" alt=\"bolitotherus\" class=\"wp-image-14479\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m14-1a.jpg 722w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m14-1a-300x214.jpg 300w\" sizes=\"auto, (max-width: 722px) 100vw, 722px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"uwm-l-col\">\n<figure class=\"\"><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m-f14-4b.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1494\" height=\"1067\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m-f14-4b.jpg\" alt=\"bolitotherus\" class=\"wp-image-14478\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m-f14-4b.jpg 1494w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m-f14-4b-300x214.jpg 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m-f14-4b-1024x731.jpg 1024w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-m-f14-4b-768x548.jpg 768w\" sizes=\"auto, (max-width: 1494px) 100vw, 1494px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"uwm-l-row\">\n<div class=\"uwm-l-col\">\n<figure class=\"\"><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-fe14-4b.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"687\" height=\"687\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-fe14-4b.jpg\" alt=\"bolitotherus\" class=\"wp-image-14477\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-fe14-4b.jpg 687w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-fe14-4b-300x300.jpg 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-fe14-4b-150x150.jpg 150w\" sizes=\"auto, (max-width: 687px) 100vw, 687px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"uwm-l-col\">\n<figure class=\"\"><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-fe-mites14-2b.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"531\" height=\"379\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-fe-mites14-2b.jpg\" alt=\"bolitotherus\" class=\"wp-image-14476\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-fe-mites14-2b.jpg 531w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2023\/11\/bolitotherus-fe-mites14-2b-300x214.jpg 300w\" sizes=\"auto, (max-width: 531px) 100vw, 531px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"uwm-l-col\"><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Forked Fungus Beetle<\/h3>\n\n\n\n<p>Males look like half-inch long triceratops. Their horns can vary in size quite a bit, and most males have a small, forked, rhino-like horn at the end of their snout that the BugLady does not see in her photographs (hers is a bi-ceratops). Females don\u2019t have horns, but the lower edges of their heads are widened, and they wear an extra bit of armor plate on their opposite ends (more about that later). They are drab, knobbed, pitted, exceedingly \u201cthick-skinned,\u201d and primordial. Oh, but then there\u2019s that beautiful gold fringe on the underside of the male\u2019s horns\u2014The Beetle with the Fringe on Top. It has been suggested that the hairs serve some general sensory function, but the BugLady couldn\u2019t find any corroboration of that, and considering the FFB\u2019s lifestyle, the hairs must take quite a beating.<\/p>\n\n\n\n<p>About the natural history of the FFB we know plenty, thanks to <a href=\"http:\/\/www.americaninsects.net\/b\/forked-fungus-beetles.html\">research done in the 1950\u2019s by M. Pferrer Liles and in the \u201860\u2019s by Ann Pace<\/a>. All stages of the beetle live and overwinter and reproduce and feed in\/on woody shelf fungi (here in God\u2019s Country they like the artist\u2019s fungus, <em>Ganoderma applanatum<\/em>). Once they find a good fungus, a small population of beetles may occupy it for as long as nine years, moving on when the fungus is no longer usable. Larvae turn the fungus into a honeycomb of tunnels. Though there may be several larvae in a tunnel, they stay out of each other\u2019s way; but if, in its travels, a larva stumbles across a FFB pupa, it might cannibalize the pupa. M. Pferrer Liles noted that larval tunnels often contained masses of white <em>mycelium<\/em> (fungal strands) that had grown around and permeated the body cavity of a dead FFB larva. Fungus mummifies larva\u2014sounds like something the BugLady saw on <em>The X-Files.<\/em><\/p>\n\n\n\n<p>They have few predators. A braconid wasp parasitizes the larvae, and a few nocturnal mammals try to eat them (more about that later, too).<\/p>\n\n\n\n<p>So, what was the twitching all about? The male initiates courtship by climbing onto the female, facing the opposite direction and griping her <em>elytra<\/em> (hard wing covers). Scientists have actually measured an FFB\u2019s grip strength, because having won Fair Maid, he may be dislodged by the horns of her other ardent suitors. Males use the horns in pushing contests, and the guy with the biggest horns usually wins; likewise, bigger beetles have longer legs and a stronger grip. Anyhow, there he sits, rubbing her head with his feet and, yes, twitching. In this position, the underneath of his abdomen rubs against two \u201ctubercles\u201d on the top of her thorax. The friction may produce a rasping sound that can be heard six or more feet away (the BugLady didn\u2019t hear it, but the sound is typically made at night, and the movements can be made without producing the sound). Courtship may last several hours.<\/p>\n\n\n\n<figure class=\"aligncenter uwm-c-img--center\"><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2016\/10\/bolitotherus-fe14-4b.jpg\"><img decoding=\"async\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2016\/10\/bolitotherus-fe14-4b.jpg\" alt=\"bolitotherus-fe14-4b\" class=\"wp-image-1611\" \/><\/a><\/figure>\n\n\n\n<p>When copulation is imminent, he turns around so they are facing the same direction. According to one source, females do not pick their suitors, but they can decide which male shares his bodily fluids with her. If she is not receptive to the male, she can block the transfer of his spermatophore by not opening the heavy plates at her rear. After mating, the male stays in place for a long time, guarding his investment from other males.<\/p>\n\n\n\n<p>A female lays very few eggs a year (a dozen at most), and before each egg, she must court. Eggs are laid singly, in the early evening, in cracks on the tops and sides of the fungus. She picks her nursery carefully\u2014studies have shown that larvae that develop in larger fungi not only have a better survival rate, but the male larvae will have larger horns when they mature (and they\u2019ll get all the girls). Once laid, each egg is plastered over with what was tactfully described as \u201ca dark, excrement-like material\u201d that is smoothed down by hairs on the female\u2019s abdomen.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Chemical Defense<\/h4>\n\n\n\n<p>FFBs lead unhurried lives. The larvae stay in their eggs for several days after hatching, eating the capsule itself before burrowing into the spore-bearing tissues of the fungus, and the new adults stay in their pupal cases for a few days after emerging, until their color darkens (here\u2019s a <a href=\"http:\/\/bugguide.net\/node\/view\/97192\/bgimage\">newly emerged male<\/a>). An adult may live for four or five years, never venturing far from its natal fungus. In fact, until 1999 scientists were unsure about whether FFBs could fly (they can), and assumed that FFBs hoofed it across the forest floor to new sites. There are two generations per year; larvae overwinter within their fungi; adults stay in fungi, decaying stumps, and under tree bark.<\/p>\n\n\n\n<p>It\u2019s hard to imagine that a beetle that looks like it heaved itself up out of the very wood itself would need a sophisticated defense system, but the FFB has a dandy one. Oh, sure, a startled adult FFB, like many other kinds of beetles including Tenebrionids, plays dead (death feigning). It tucks its legs into dedicated grooves on the underside of its body, and blends in with its surroundings. But, it\u2019s got a chemical trick up its sleeve, too.<\/p>\n\n\n\n<p>When it feels threatened, an FFB releases a nasty-smelling, irritating potion that causes a potential predator to reconsider. Rather than squirting the liquid like a squeeze bottle, FFBs carry the chemical deterrent in two \u201ceversible\u201d abdominal glands that turn inside out like a pocket. What\u2019s unique is the timing and the trigger.<\/p>\n\n\n\n<p>In <em>Secret Weapons<\/em>, Eisner says that \u201cAn unusual feature of <em>B. cornutus<\/em> is that it may extrude its glands preemptively, in response to the mere anticipation of an attack. All you need do to cause the beetle to evert its glands is to breathe on it. This readiness to deploy its chemical weapons may serve the beetle well, especially in defense against predators such as mice, which could afflict a fatal injury with their very first bite.\u201d Eisner goes on to say that the FFB defines a \u201cbreath\u201d as a warm, moist, pulsing puff of carbon dioxide. Producing a chemical defense is costly, energy-wise, and the FFB is unusual in using it before its predator actually makes contact. The unfortunate herbivore that mouths the inhabited fungus may suffer the same fate. FFBs do not use a cannon to kill a gnat\u2014when nibbled by an ant, they depend on the toughness of their exoskeleton. For many close-up pictures, includes some of a <a href=\"http:\/\/www.performance-vision.com\/FungusBeetle\/\">beetle spraying<\/a>.<\/p>\n\n\n\n<p>Last but not least\u2014yes\u2014phoresy! Those legged, pink dots on the female FFB\u2019s head are mites! A number of different species of mites have been documented on FFBs. In one study, researchers checked FFBs in a museum collection for phoretic (hitchhiking) mites and found them on about one-third of the beetles. The mites are species that live in fungi\u2014some eat spores\u2014and they take advantage of the FFB\u2019s longer legs to get around.<\/p>\n\n\n\n<p>Those horns remind the BugLady of one of her favorite cartoon characters, <em>The Tick<\/em> . And as the Tick once said, \u201cMysteries abound.\u201d<\/p>\n\n\n\n<p>&nbsp;<br><em>The BugLady<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The <strong>Forked Fungus Beetle<\/strong> is in the Darkling beetle family Tenebrionidae and is the only species in its genus. It\u2019s found east of the Mississippi, at night, in the woods, in the company of woody, polypore shelf fungi. All stages of the beetle live and overwinter and reproduce and feed in\/on woody shelf fungi.<\/p>\n","protected":false},"author":1070,"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":[30],"class_list":["post-2584","post","type-post","status-publish","format-standard","hentry","category-bug-of-the-week","tag-beetles"],"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\/forked-fungus-beetle\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Forked Fungus Beetle (Family Tenebrionidae)\" \/>\n<meta property=\"og:description\" content=\"The Forked Fungus Beetle is in the Darkling beetle family Tenebrionidae and is the only species in its genus. 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It\u2019s found east of the Mississippi, at night, in the woods, in the company of woody, polypore shelf fungi. 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