


{"id":1095,"date":"2020-04-30T09:50:22","date_gmt":"2020-04-30T09:50:22","guid":{"rendered":"http:\/\/www.nhmmaastricht.nl\/?p=1095"},"modified":"2024-10-22T13:09:47","modified_gmt":"2024-10-22T13:09:47","slug":"zee-egels","status":"publish","type":"post","link":"https:\/\/www.nhmmaastricht.nl\/fossiele-schat\/zee-egels\/","title":{"rendered":"Zee-egels"},"content":{"rendered":"<div id=\"pl-1095\"  class=\"panel-layout\" ><div id=\"pg-1095-0\"  class=\"panel-grid panel-no-style\" ><div id=\"pgc-1095-0-0\"  class=\"panel-grid-cell\" ><div id=\"panel-1095-0-0-0\" class=\"so-panel widget_sow-editor panel-first-child\" data-index=\"0\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<h1 class=\"p1\">Een zee-egel die heel wat te verduren had...<\/h1>\n<p class=\"p1\">Het was Professor Umbgrove die in het midden van de jaren 50 van de vorige eeuw zich liet ontvallen dat alle straten van Maastricht bekleed zouden zijn met de schalen van de zee-egel <i>Hemipneustes striatoradiatus<\/i> (Leske, 1778) als die soort nog bedrevener in haar voortplanting geweest zou zijn...<\/p>\n<\/div>\n<\/div><\/div><div id=\"panel-1095-0-0-1\" class=\"so-panel widget_sow-editor panel-last-child\" data-index=\"1\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<p class=\"p1\">Bovenstaande is enigszins overdreven, maar toch - de zee-egel is ruimschoots vertegenwoordigd in alle Krijtcollecties van musea, universiteiten en amateur verzamelaars.<\/p>\n<p class=\"p1\">De grote (tot 11 cm, of meer) bolvormige schaal, met platte onderkant en grote mond- en anusopeningen aan die zijde, is niet te missen. Het is een gewild verzamelobject. Juist omdat die zee-egel een bolvormige omtrek heeft, weten we dat het dier zich maar voor een heel klein deel kon ingegraven in de zeebodem. Het overgrote deel van de schaal bleef zichtbaar op die bodem, terwijl het dier al ploegend op zoek was naar voedseldeeltjes.<\/p>\n<p class=\"p1\">Goed zichtbaar zijn op de zeebodem betekent ook dat je gezien wordt door roofdieren, of predatoren, zoals vissen, haaien, roggen en kreeftachtigen. Een flink aantal exemplaren van <i>Hemipneustes<\/i> vertoont littekens op de schaal - de stille getuigen van beten die door de zee-egel hersteld konden worden. Soms leidden dit soort aanvallen tot misvorming of scheefgroei van de schaal, zoals foto\u2019s 1 en 2 laten zien. Dit zijn duidelijke aanwijzingen voor invloed van buitenaf. Ook van binnenuit kon het echter af en toe behoorlijk misgaan door ziektes en\/of infecties. Daar zijn ook mooie voorbeelden van in de diverse collecties. Die komen dan in een latere bijdrage aan bod.<\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><div id=\"pg-1095-1\"  class=\"panel-grid panel-no-style\" ><div id=\"pgc-1095-1-0\"  class=\"panel-grid-cell\" ><div id=\"panel-1095-1-0-0\" class=\"so-panel widget_sow-image panel-first-child\" data-index=\"2\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-image so-widget-sow-image-default-8b5b6f678277-1095\"\n\t\t\t\n\t\t>\n<div class=\"sow-image-container\">\n\t\t<img fetchpriority=\"high\" \n\tsrc=\"https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_2.jpg\" width=\"851\" height=\"567\" srcset=\"https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_2.jpg 851w, https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_2-300x200.jpg 300w, https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_2-768x512.jpg 768w, https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_2-272x182.jpg 272w\" sizes=\"(max-width: 851px) 100vw, 851px\" alt=\"\" \t\tclass=\"so-widget-image\"\/>\n\t<\/div>\n\n<\/div><\/div><div id=\"panel-1095-1-0-1\" class=\"so-panel widget_sow-editor panel-last-child\" data-index=\"3\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<p class=\"p1\"><span class=\"s1\"><i>Foto 1. Scheefgroei in <\/i><b><i>Hemipneustes striatoradiatus<\/i><\/b><\/span><i> (collecties Natuurhistorisch Museum Maastricht, MK 860 A2; foto\u2019s Mart Deckers)<\/i><\/p>\n<\/div>\n<\/div><\/div><\/div><div id=\"pgc-1095-1-1\"  class=\"panel-grid-cell\" ><div id=\"panel-1095-1-1-0\" class=\"so-panel widget_sow-image panel-first-child\" data-index=\"4\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-image so-widget-sow-image-default-8b5b6f678277-1095\"\n\t\t\t\n\t\t>\n<div class=\"sow-image-container\">\n\t\t<img \n\tdata-src=\"https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_3.jpg\" width=\"851\" height=\"567\" data-srcset=\"https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_3.jpg 851w, https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_3-300x200.jpg 300w, https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_3-768x512.jpg 768w, https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_3-272x182.jpg 272w\" data-sizes=\"(max-width: 851px) 100vw, 851px\" alt=\"\" \t\tclass=\"so-widget-image lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 851px; --smush-placeholder-aspect-ratio: 851\/567;\" \/>\n\t<\/div>\n\n<\/div><\/div><div id=\"panel-1095-1-1-1\" class=\"so-panel widget_sow-editor panel-last-child\" data-index=\"5\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<p class=\"p1\"><i>Foto 2. Flinke beschadiging, herstel en scheefgroei in <\/i><b><i>Hemipneustes striatoradiatus<\/i><\/b><i> (collecties Natuurhistorisch Museum Maastricht, MK 890 A8; foto\u2019s Mart Deckers)<\/i><\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><div id=\"pg-1095-2\"  class=\"panel-grid panel-no-style\" ><div id=\"pgc-1095-2-0\"  class=\"panel-grid-cell\" ><div id=\"panel-1095-2-0-0\" class=\"so-panel widget_sow-editor panel-first-child panel-last-child\" data-index=\"6\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<p class=\"p1\">Ook na de dood van de zee-egel, als alle stekels er waren afgevallen, bleef de schaal een tijdlang op de zeebodem beschikbaar voor andere dieren om zich op vast te hechten of in te boren. Foto 3 laat een prachtig voorbeeld zien van een doorboorde schaal. Het gat gaat dwars door de zee-egelschaal, van de boven- naar de onderzijde; daarbij neemt de diameter iets toe, zoals op de foto te zien is. Uit de vorm van het gat kan worden opgemaakt dat het door een boormossel uit de familie Lithophagidae (letterlijk: steeneters) gemaakt moet zijn. Die mossel heeft zich daarbij een beetje vergist, want normaal gesproken blijven boormossels in het door henzelf geboorde gat zitten, totdat ze dood gaan. Boormossels hebben vaak een combinatie van mechanische en chemische foefjes ter beschikking om te boren in kalkachtig materiaal. Aan de kusten van landen rond de Middellandse Zee is dit prachtig te zien.<\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><div id=\"pg-1095-3\"  class=\"panel-grid panel-no-style\" ><div id=\"pgc-1095-3-0\"  class=\"panel-grid-cell\" ><div id=\"panel-1095-3-0-0\" class=\"so-panel widget_sow-image panel-first-child\" data-index=\"7\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-image so-widget-sow-image-default-8b5b6f678277-1095\"\n\t\t\t\n\t\t>\n<div class=\"sow-image-container\">\n\t\t<img \n\tdata-src=\"https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_4.jpg\" width=\"851\" height=\"567\" data-srcset=\"https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_4.jpg 851w, https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_4-300x200.jpg 300w, https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_4-768x512.jpg 768w, https:\/\/www.nhmmaastricht.nl\/wp-content\/uploads\/2020\/07\/Zee-egel_4-272x182.jpg 272w\" data-sizes=\"(max-width: 851px) 100vw, 851px\" alt=\"\" \t\tclass=\"so-widget-image lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 851px; --smush-placeholder-aspect-ratio: 851\/567;\" \/>\n\t<\/div>\n\n<\/div><\/div><div id=\"panel-1095-3-0-1\" class=\"so-panel widget_sow-editor panel-last-child\" data-index=\"8\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<p class=\"p1\"><i>Foto 3. <\/i><b><i>Hemipneustes striatoradiatus<\/i><\/b><i> met boorgat van een tweekleppige (collectie Jules Snellings; foto\u2019s Mart Deckers)<\/i><\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><div id=\"pg-1095-4\"  class=\"panel-grid panel-no-style\" ><div id=\"pgc-1095-4-0\"  class=\"panel-grid-cell\" ><div id=\"panel-1095-4-0-0\" class=\"so-panel widget_sow-editor panel-first-child panel-last-child\" data-index=\"9\" ><div\n\t\t\t\n\t\t\tclass=\"so-widget-sow-editor so-widget-sow-editor-base\"\n\t\t\t\n\t\t>\n<div class=\"siteorigin-widget-tinymce textwidget\">\n\t<p class=\"p1\"><b>Leesvoer<\/b><\/p>\n<p class=\"p1\">Jagt, J.W.M., 2000. Late Cretaceous-Early Palaeogene echinoderms and the K\/T boundary in the southeast Netherlands and northeast Belgium \u2013 Part 4: Echinoids. <i>Scripta Geologica<\/i>, <b>121<\/b>, 181-375, 30 pls. [downloaden via: <span class=\"s1\">http:\/\/www.repository.naturalis.nl\/record\/219114<\/span>]<\/p>\n<p class=\"p1\">Jagt, J.W.M., Van Bakel, B.W.M., Deckers, M.J.M., Donovan, S.K., Fraaije, R.H.B., Jagt-Yazykova, E.A., Laffineur, J., Nieuwenhuis, E. &amp; Thijs, B., 2018. Late Cretaceous echinoderm \u2018odds and ends\u2019 from the Low Countries. <i>Contemporary Trends in Geosciences<\/i>, <b>7<\/b>(3), 255-282. [downloaden via: <span class=\"s1\">www.kgs.wnoz.us.edu.pl\/ctg\/ctg-archive<\/span>]<\/p>\n<p class=\"p1\">Umbgrove, J.H.F., 1956. <i>Ons land zeventig millioen jaar geleden. Levensschetsen uit de Krijtperiode<\/i>, xiii + 150 pp., \u2019s Gravenhage, Martinus Nijhoff.<\/p>\n<p class=\"p3\"><span class=\"s2\">www.nhm.ac.uk\/our-science\/data\/echinoid-directory<\/span><\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Een zee-egel die heel wat te verduren had&#8230; Het was Professor Umbgrove die in het midden van de jaren 50 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1096,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1095","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fossiele-schat"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Zee-egels - Natuurhistorisch Museum Maastricht<\/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:\/\/www.nhmmaastricht.nl\/fossiele-schat\/zee-egels\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Zee-egels - Natuurhistorisch Museum Maastricht\" \/>\n<meta property=\"og:description\" content=\"Een zee-egel die heel wat te verduren had... 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