{"id":6566,"date":"2026-09-27T14:27:19","date_gmt":"2026-09-27T12:27:19","guid":{"rendered":"https:\/\/lesminis.fr\/blog\/?p=6566"},"modified":"2026-09-27T14:27:19","modified_gmt":"2026-09-27T12:27:19","slug":"monstre-de-tully-tullimonstrum","status":"publish","type":"post","link":"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/","title":{"rendered":"Le monstre de Tully, le fossile qui r\u00e9siste aux pal\u00e9ontologues depuis 70 ans"},"content":{"rendered":"<p>En 1955, Francis Tully, un collectionneur amateur de l&rsquo;Illinois, trouve dans les terrils de Mazon Creek un fossile qu&rsquo;il ne sait pas identifier. Les pal\u00e9ontologues du Field Museum de Chicago non plus. Soixante-dix ans plus tard, ce petit animal marin de 310 millions d&rsquo;ann\u00e9es n&rsquo;a toujours pas trouv\u00e9 sa place dans l&rsquo;arbre du vivant. Le monstre de Tully (<em>Tullimonstrum gregarium<\/em>) est l&rsquo;une des plus belles \u00e9nigmes de la pal\u00e9ontologie, et l&rsquo;un des meilleurs exemples de la fa\u00e7on dont la science avance quand elle ne sait pas.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87_1 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/#Un_animal_que_personne_narrive_a_ranger\" >Un animal que personne n&rsquo;arrive \u00e0 ranger<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/#Mazon_Creek_un_estuaire_fige_il_y_a_310_millions_dannees\" >Mazon Creek, un estuaire fig\u00e9 il y a 310 millions d&rsquo;ann\u00e9es<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/#Soixante_ans_de_debat_etude_apres_etude\" >Soixante ans de d\u00e9bat, \u00e9tude apr\u00e8s \u00e9tude<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/#Ce_que_lon_peut_affirmer_aujourdhui\" >Ce que l&rsquo;on peut affirmer aujourd&rsquo;hui<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/#Pourquoi_ce_mystere_est_une_bonne_nouvelle\" >Pourquoi ce myst\u00e8re est une bonne nouvelle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/#Questions_frequentes_sur_le_monstre_de_Tully\" >Questions fr\u00e9quentes sur le monstre de Tully<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/#Le_monstre_de_Tully_est-il_un_dinosaure\" >Le monstre de Tully est-il un dinosaure ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/#Quelle_taille_faisait_le_monstre_de_Tully\" >Quelle taille faisait le monstre de Tully ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/#Le_monstre_de_Tully_est-il_un_vertebre\" >Le monstre de Tully est-il un vert\u00e9br\u00e9 ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/lesminis.fr\/blog\/monstre-de-tully-tullimonstrum\/#Ou_voir_un_fossile_du_monstre_de_Tully\" >O\u00f9 voir un fossile du monstre de Tully ?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Un_animal_que_personne_narrive_a_ranger\"><\/span>Un animal que personne n&rsquo;arrive \u00e0 ranger<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Le monstre de Tully mesurait de 8 \u00e0 35 centim\u00e8tres. Son corps allong\u00e9, en forme de cigare, se terminait par une nageoire caudale en losange. Jusque-l\u00e0, rien d&rsquo;\u00e9trange.<\/p>\n<p>Le reste l&rsquo;est beaucoup plus. \u00c0 l&rsquo;avant, une longue trompe se terminait par une petite pince arm\u00e9e de dents fines, jusqu&rsquo;\u00e0 huit de chaque c\u00f4t\u00e9. Sur le dessus du corps, une barre rigide portait \u00e0 chaque extr\u00e9mit\u00e9 un \u0153il, comme un marteau pos\u00e9 en travers. Aucun animal actuel ne combine ces caract\u00e8res.<\/p>\n<p>Autre difficult\u00e9 : il n&rsquo;avait aucune partie dure. Ni os, ni coquille, ni carapace. Tout ce que l&rsquo;on sait de lui vient d&#8217;empreintes de tissus mous, \u00e9cras\u00e9es \u00e0 plat dans la roche. C&rsquo;est ce qui rend chaque interpr\u00e9tation si d\u00e9licate.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Mazon_Creek_un_estuaire_fige_il_y_a_310_millions_dannees\"><\/span>Mazon Creek, un estuaire fig\u00e9 il y a 310 millions d&rsquo;ann\u00e9es<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Les fossiles du monstre de Tully proviennent tous d&rsquo;un m\u00eame gisement, Mazon Creek, au sud-ouest de Chicago. Au Carbonif\u00e8re, la r\u00e9gion \u00e9tait une c\u00f4te tropicale, parcourue d&rsquo;estuaires boueux o\u00f9 se jetaient des fleuves charg\u00e9s de s\u00e9diments.<\/p>\n<p>Quand un animal mourait et s&rsquo;enfon\u00e7ait dans cette boue, du carbonate de fer se d\u00e9posait parfois autour de son corps et formait un nodule dur, une concr\u00e9tion. \u00c0 l&rsquo;int\u00e9rieur, les formes molles \u00e9taient conserv\u00e9es avec une pr\u00e9cision rare : m\u00e9duses, vers, crevettes, limules, et m\u00eame des animaux terrestres emport\u00e9s par les crues. Les pal\u00e9ontologues parlent de \u00ab Lagerst\u00e4tte \u00bb, un gisement \u00e0 conservation exceptionnelle.<\/p>\n<p>Le monstre de Tully y est si courant que plus d&rsquo;un millier de sp\u00e9cimens ont \u00e9t\u00e9 r\u00e9colt\u00e9s, d&rsquo;o\u00f9 son nom d&rsquo;esp\u00e8ce, <em>gregarium<\/em>, \u00ab commun \u00bb. Depuis 1989, il est le fossile officiel de l&rsquo;\u00c9tat de l&rsquo;Illinois.<\/p>\n<figure id=\"attachment_6568\" aria-describedby=\"caption-attachment-6568\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6568\" src=\"https:\/\/lesminis.fr\/blog\/wp-content\/uploads\/2026\/09\/tully-1.jpg\" alt=\"Fossile partiel de monstre de Tully dans une concr\u00e9tion allong\u00e9e de Mazon Creek\" width=\"800\" height=\"266\" srcset=\"https:\/\/lesminis.fr\/blog\/wp-content\/uploads\/2026\/09\/tully-1.jpg 800w, https:\/\/lesminis.fr\/blog\/wp-content\/uploads\/2026\/09\/tully-1-300x100.jpg 300w, https:\/\/lesminis.fr\/blog\/wp-content\/uploads\/2026\/09\/tully-1-768x255.jpg 768w, https:\/\/lesminis.fr\/blog\/wp-content\/uploads\/2026\/09\/tully-1-696x231.jpg 696w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-6568\" class=\"wp-caption-text\">Un sp\u00e9cimen incomplet, comme beaucoup de fossiles de Mazon Creek. Photo James St. John, CC BY 2.0, Orton Geology Museum.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Soixante_ans_de_debat_etude_apres_etude\"><\/span>Soixante ans de d\u00e9bat, \u00e9tude apr\u00e8s \u00e9tude<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Le monstre de Tully est d\u00e9crit en 1966 par Eugene Richardson, du Field Museum, qui le nomme en hommage \u00e0 son d\u00e9couvreur. Il ne le classe dans aucun groupe connu. Pendant cinquante ans, les hypoth\u00e8ses se succ\u00e8dent : ver, mollusque, arthropode.<\/p>\n<p><strong>2016, un vert\u00e9br\u00e9 ?<\/strong> Deux \u00e9tudes publi\u00e9es le m\u00eame jour dans <em>Nature<\/em> relancent tout. La premi\u00e8re, men\u00e9e par Victoria McCoy \u00e0 partir de plus d&rsquo;un millier de sp\u00e9cimens, d\u00e9crit une structure qu&rsquo;elle interpr\u00e8te comme une corde dorsale et rapproche l&rsquo;animal des lamproies. La seconde, dirig\u00e9e par Thomas Clements, analyse les yeux : ils contiennent des m\u00e9lanosomes, de minuscules grains de pigment, organis\u00e9s en couches comme dans la r\u00e9tine des vert\u00e9br\u00e9s.<\/p>\n<p><strong>2017, la contestation.<\/strong> Une \u00e9quipe men\u00e9e par Lauren Sallan r\u00e9pond dans la revue <em>Palaeontology<\/em>. Selon elle, la suppos\u00e9e corde dorsale s&rsquo;\u00e9tend en avant des yeux, ce qu&rsquo;aucun vert\u00e9br\u00e9 ne fait. Les yeux pigment\u00e9s existent aussi chez certains invert\u00e9br\u00e9s, comme les c\u00e9phalopodes.<\/p>\n<p><strong>2020 et 2022, la chimie \u00e0 la rescousse.<\/strong> Des analyses spectroscopiques des restes organiques concluent que leur composition ressemble davantage \u00e0 celle de tissus de vert\u00e9br\u00e9s d\u00e9grad\u00e9s qu&rsquo;\u00e0 celle d&rsquo;invert\u00e9br\u00e9s. L&rsquo;hypoth\u00e8se vert\u00e9br\u00e9e tient bon.<\/p>\n<p><strong>2023, 153 sp\u00e9cimens scann\u00e9s.<\/strong> Une \u00e9quipe japonaise dirig\u00e9e par Tomoyuki Mikami examine 153 fossiles en trois dimensions, au laser et au scanner \u00e0 rayons X. Elle observe que la segmentation du corps se prolonge jusque dans la t\u00eate, un caract\u00e8re inconnu chez les vert\u00e9br\u00e9s. Sa conclusion : le monstre de Tully n&rsquo;est pas un vert\u00e9br\u00e9, sans pouvoir dire ce qu&rsquo;il est.<\/p>\n<p><strong>2025, un mollusque nageur ?<\/strong> Dans une synth\u00e8se publi\u00e9e dans <em>Geology Today<\/em>, Simon Braddy propose une nouvelle piste : un mollusque planctonique apparent\u00e9 aux h\u00e9t\u00e9ropodes actuels, des gast\u00e9ropodes transparents qui nagent en pleine eau. L&rsquo;hypoth\u00e8se reste \u00e0 tester.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ce_que_lon_peut_affirmer_aujourdhui\"><\/span>Ce que l&rsquo;on peut affirmer aujourd&rsquo;hui<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Certaines choses ne font aucun doute, car elles se voient directement sur les fossiles : la forme du corps, la trompe \u00e0 pince, la barre des yeux, la nageoire caudale, l&rsquo;absence de squelette min\u00e9ralis\u00e9. On sait aussi que l&rsquo;animal \u00e9tait sym\u00e9trique, avec un c\u00f4t\u00e9 gauche et un c\u00f4t\u00e9 droit, et qu&rsquo;il vivait dans les eaux c\u00f4ti\u00e8res de Mazon Creek il y a environ 310 millions d&rsquo;ann\u00e9es.<\/p>\n<p>D&rsquo;autres points sont des d\u00e9ductions : ses yeux, pigment\u00e9s et munis d&rsquo;un cristallin, formaient probablement des images ; sa pince servait sans doute \u00e0 saisir de petites proies.<\/p>\n<p>Tout le reste est d\u00e9battu, \u00e0 commencer par l&rsquo;essentiel : \u00e0 quel grand groupe d&rsquo;animaux il appartient. On ignore aussi comment il se d\u00e9pla\u00e7ait, ce qu&rsquo;il mangeait exactement et s&rsquo;il a laiss\u00e9 des descendants.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Pourquoi_ce_mystere_est_une_bonne_nouvelle\"><\/span>Pourquoi ce myst\u00e8re est une bonne nouvelle<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Le monstre de Tully montre la science telle qu&rsquo;elle fonctionne vraiment. Une hypoth\u00e8se est publi\u00e9e dans une grande revue, d&rsquo;autres chercheurs la contestent, de nouvelles m\u00e9thodes apportent de nouveaux indices, et personne ne tranche tant que les preuves manquent. Chaque \u00e9tude, m\u00eame contredite, a fait progresser la connaissance de l&rsquo;animal.<\/p>\n<p>C&rsquo;est aussi un excellent sujet \u00e0 explorer avec des enfants : il leur apprend que \u00ab on ne sait pas \u00bb est une r\u00e9ponse honn\u00eate, et qu&rsquo;un fossile peut rester une \u00e9nigme malgr\u00e9 plus d&rsquo;un millier de sp\u00e9cimens.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Questions_frequentes_sur_le_monstre_de_Tully\"><\/span>Questions fr\u00e9quentes sur le monstre de Tully<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Le_monstre_de_Tully_est-il_un_dinosaure\"><\/span>Le monstre de Tully est-il un dinosaure ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Non. Il vivait au Carbonif\u00e8re, il y a environ 310 millions d&rsquo;ann\u00e9es, plus de 70 millions d&rsquo;ann\u00e9es avant les premiers dinosaures. C&rsquo;\u00e9tait un petit animal marin sans squelette.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Quelle_taille_faisait_le_monstre_de_Tully\"><\/span>Quelle taille faisait le monstre de Tully ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>De 8 \u00e0 35 centim\u00e8tres de long. Malgr\u00e9 son nom, c&rsquo;\u00e9tait un petit animal.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Le_monstre_de_Tully_est-il_un_vertebre\"><\/span>Le monstre de Tully est-il un vert\u00e9br\u00e9 ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>C&rsquo;est la grande question. Deux \u00e9tudes de 2016 l&rsquo;ont class\u00e9 parmi les vert\u00e9br\u00e9s, mais une analyse de 153 sp\u00e9cimens publi\u00e9e en 2023 a conclu le contraire. Sa classification reste inconnue.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ou_voir_un_fossile_du_monstre_de_Tully\"><\/span>O\u00f9 voir un fossile du monstre de Tully ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Les principales collections se trouvent aux \u00c9tats-Unis, notamment au Field Museum de Chicago et dans les mus\u00e9es de l&rsquo;Illinois.<\/p>\n<p><strong>Pour explorer les mers du Pal\u00e9ozo\u00efque :<\/strong> la <a href=\"https:\/\/lesminis.fr\/lumilidae-horseshoe-crab-collecta-88905\/6833.html\">figurine de limule CollectA<\/a> repr\u00e9sente un groupe pr\u00e9sent \u00e0 Mazon Creek et toujours vivant aujourd&rsquo;hui, le <a href=\"https:\/\/lesminis.fr\/figurine-cooperoceras-cephalopode-prehistorique-collecta-88946\/14795.html\">Cooperoceras<\/a> est un c\u00e9phalopode du m\u00eame Carbonif\u00e8re, et nos <a href=\"https:\/\/lesminis.fr\/1216-materiel-svt-paleontologie\">outils de pal\u00e9ontologie<\/a> permettent de s&rsquo;initier \u00e0 la fouille.<\/p>\n<p><strong>Sources :<\/strong><\/p>\n<ul>\n<li>Richardson, E. S. Jr. (1966). Wormlike fossil from the Pennsylvanian of Illinois. <em>Science<\/em>, 151.<\/li>\n<li>McCoy, V. E. et al. (2016). The \u00ab Tully monster \u00bb is a vertebrate. <em>Nature<\/em>, 532.<\/li>\n<li>Clements, T. et al. (2016). The eyes of <em>Tullimonstrum<\/em> reveal a vertebrate affinity. <em>Nature<\/em>, 532.<\/li>\n<li>Sallan, L. et al. (2017). The \u00ab Tully Monster \u00bb is not a vertebrate: characters, convergence and taphonomy in Palaeozoic problematic animals. <em>Palaeontology<\/em>, 60.<\/li>\n<li>Mikami, T. et al. (2023). Three-dimensional anatomy of the Tully monster casts doubt on its presumed vertebrate affinities. <em>Palaeontology<\/em>, 66.<\/li>\n<li>Braddy, S. (2025). The Tully monster remains an evolutionary enigma. <em>Geology Today<\/em>, 41.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>D\u00e9couvert en 1955 dans l&rsquo;Illinois, le monstre de Tully r\u00e9siste depuis aux pal\u00e9ontologues : vert\u00e9br\u00e9 pour Nature en 2016, \u00e9cart\u00e9 des vert\u00e9br\u00e9s en 2023 apr\u00e8s l&rsquo;examen de 153 fossiles. R\u00e9cit d&rsquo;une \u00e9nigme vieille de 310 millions d&rsquo;ann\u00e9es.<\/p>\n","protected":false},"author":1,"featured_media":6567,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1602],"tags":[2723,2724,370,2721,2722],"class_list":["post-6566","post","type-post","status-publish","format-standard","has-post-thumbnail","category-dinosaures-prehistoire-megafaune-figurine","tag-carbonifere","tag-enigmes-de-la-paleontologie","tag-fossiles","tag-monstre-de-tully","tag-tullimonstrum"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Monstre de Tully : le fossile que personne n&#039;arrive \u00e0 ranger<\/title>\n<meta name=\"description\" content=\"Le monstre de Tully, fossile de 310 millions d&#039;ann\u00e9es, r\u00e9siste aux pal\u00e9ontologues depuis 1955. 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