{"id":9275,"date":"2025-11-26T13:11:09","date_gmt":"2025-11-26T12:11:09","guid":{"rendered":"https:\/\/clientes.munecarusa.com\/mp\/?p=9275"},"modified":"2026-02-18T14:29:00","modified_gmt":"2026-02-18T13:29:00","slug":"graptolithina","status":"publish","type":"post","link":"https:\/\/clientes.munecarusa.com\/mp\/graptolithina\/","title":{"rendered":"Graptolithina"},"content":{"rendered":"<p>[et_pb_section fb_built=\u00bb1&#8243; custom_padding_last_edited=\u00bboff|phone\u00bb disabled_on=\u00bboff|off|off\u00bb admin_label=\u00bbFondo Men\u00fa\u00bb _builder_version=\u00bb4.27.2&#8243; background_color=\u00bb#ff6600&#8243; custom_margin=\u00bb0px||20px||false|false\u00bb custom_padding=\u00bb0px||0px||true|false\u00bb collapsed=\u00bbon\u00bb global_colors_info=\u00bb{}\u00bb][\/et_pb_section][et_pb_section fb_built=\u00bb1&#8243; custom_padding_last_edited=\u00bbon|phone\u00bb disabled_on=\u00bboff|off|off\u00bb admin_label=\u00bbIntroducci\u00f3n\u00bb _builder_version=\u00bb4.27.2&#8243; 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text_text_color=\u00bb#444444&#8243; background_size=\u00bbinitial\u00bb background_position=\u00bbtop_left\u00bb background_repeat=\u00bbrepeat\u00bb text_orientation=\u00bbjustified\u00bb hover_enabled=\u00bb0&#8243; text_font_size_tablet=\u00bb16px\u00bb text_font_size_phone=\u00bb14px\u00bb text_font_size_last_edited=\u00bbon|phone\u00bb text_line_height_tablet=\u00bb1.7em\u00bb text_line_height_phone=\u00bb1.6em\u00bb text_line_height_last_edited=\u00bbon|phone\u00bb global_colors_info=\u00bb{}\u00bb sticky_enabled=\u00bb0&#8243;]<\/p>\n<h2 style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-4309 alignleft\" src=\"https:\/\/clientes.munecarusa.com\/mp\/wp-content\/uploads\/2025\/01\/margen-huella.png\" alt=\"Graptolithina\" width=\"30\" height=\"50\" \/><\/h2>\n<p>Graptolithina, conocidos com\u00fanmente como graptolitos, es una clase extinta del filo Hemichordata, un grupo de animales marinos que incluye a los modernos pterobranquios. Los Graptolithina son famosos por su extraordinario registro f\u00f3sil, que abarca desde el C\u00e1mbrico Superior hasta el Carbon\u00edfero Inferior, aunque existe un graptolito ligeramente m\u00e1s antiguo, Chaunograptus, conocido desde el C\u00e1mbrico Medio. El nombre Graptolithina proviene del griego grapt\u00ed (\u201cescrito\u201d) y l\u00edthos (\u201cpiedra\u201d), ya que muchos f\u00f3siles se asemejan a trazos o jerogl\u00edficos grabados en la roca.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=\u00bb2_3,1_3&#8243; _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb custom_margin=\u00bb||||false|false\u00bb custom_padding=\u00bb0px||10px||false|false\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_column type=\u00bb2_3&#8243; _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb animation_style=\u00bbzoom\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_image src=\u00bbhttps:\/\/clientes.munecarusa.com\/mp\/wp-content\/uploads\/2025\/11\/Graptolithina.webp\u00bb alt=\u00bbGraptolithina\u00bb show_in_lightbox=\u00bbon\u00bb use_overlay=\u00bbon\u00bb overlay_icon_color=\u00bb#ff6600&#8243; hover_overlay_color=\u00bbrgba(255,102,0,0.2)\u00bb align=\u00bbcenter\u00bb force_fullwidth=\u00bbon\u00bb _builder_version=\u00bb4.27.4&#8243; 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_module_preset=\u00bbdefault\u00bb custom_margin=\u00bb||||false|false\u00bb custom_padding=\u00bb30px||||false|false\u00bb animation_style=\u00bbzoom\u00bb hover_enabled=\u00bb0&#8243; global_colors_info=\u00bb{}\u00bb sticky_enabled=\u00bb0&#8243;][et_pb_column type=\u00bb4_4&#8243; _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_text content_last_edited=\u00bboff|desktop\u00bb disabled_on=\u00bboff|off|off\u00bb admin_label=\u00bbTexto\u00bb _builder_version=\u00bb4.27.5&#8243; text_text_color=\u00bb#444444&#8243; background_size=\u00bbinitial\u00bb background_position=\u00bbtop_left\u00bb background_repeat=\u00bbrepeat\u00bb text_orientation=\u00bbjustified\u00bb hover_enabled=\u00bb0&#8243; text_font_size_tablet=\u00bb16px\u00bb text_font_size_phone=\u00bb14px\u00bb text_font_size_last_edited=\u00bbon|phone\u00bb text_line_height_tablet=\u00bb1.7em\u00bb text_line_height_phone=\u00bb1.6em\u00bb text_line_height_last_edited=\u00bbon|phone\u00bb global_colors_info=\u00bb{}\u00bb sticky_enabled=\u00bb0&#8243;]Esta apariencia caracter\u00edstica hizo que los primeros naturalistas pensaran que eran marcas inorg\u00e1nicas o restos de plantas, antes de comprender que se trataba de colonias animales complejas. La relaci\u00f3n entre Graptolithina y los hemicordados modernos se ha establecido mediante comparaciones con g\u00e9neros actuales como Cephalodiscus y Rhabdopleura, cuyos h\u00e1bitos coloniales y estructuras corporales muestran similitudes fundamentales con los Graptolithina f\u00f3siles.<\/p>\n<p>Cada colonia de Graptolithina, conocida como rabdosoma, estaba formada por un n\u00famero variable de ramas llamadas estipes, todas ellas originadas a partir de un individuo inicial denominado s\u00edcula. Los individuos subsiguientes, llamados zooides, se alojaban en peque\u00f1as estructuras tubulares o en forma de copa llamadas tecas. En algunas colonias de Graptolithina exist\u00edan dos tama\u00f1os distintos de teca, lo que ha llevado a sugerir la posibilidad de dimorfismo sexual dentro de la colonia. El n\u00famero de ramificaciones y la disposici\u00f3n de las tecas son caracter\u00edsticas esenciales para la identificaci\u00f3n taxon\u00f3mica de los Graptolithina, y han permitido a los paleont\u00f3logos establecer una clasificaci\u00f3n detallada basada en la morfolog\u00eda colonial.<\/p>\n<p>Los Graptolithina m\u00e1s antiguos y primitivos pertenecen al orden Dendroidea, caracterizado por colonias dendr\u00edticas o con m\u00faltiples ramificaciones. Estos dendroides aparecieron en el C\u00e1mbrico y eran animales bent\u00f3nicos, fijados al fondo marino mediante una base similar a una ra\u00edz. Los Graptolithina dendroides sobrevivieron hasta el Carbon\u00edfero, lo que demuestra su \u00e9xito evolutivo a lo largo de millones de a\u00f1os. A partir de los Graptolithina dendroides surgieron los Graptolithina del orden Graptoloidea al comienzo del Ordov\u00edcico. Estos Graptolithina graptoloideos ten\u00edan relativamente pocas ramas y adoptaron un estilo de vida pel\u00e1gico, flotando libremente en la superficie del mar. Se cree que los Graptolithina graptoloideos se manten\u00edan a flote gracias a un delgado hilo o mediante sustancias de baja densidad, posiblemente aceites. Este grupo fue extraordinariamente prol\u00edfico y se convirti\u00f3 en uno de los componentes m\u00e1s importantes del plancton durante el Ordov\u00edcico y el Sil\u00farico, hasta su declive en el Dev\u00f3nico temprano.<\/p>\n<p>Son f\u00f3siles extremadamente comunes y poseen una distribuci\u00f3n mundial. Su abundancia, su preservaci\u00f3n detallada y su r\u00e1pida evoluci\u00f3n los convierten en f\u00f3siles gu\u00eda de enorme valor para datar estratos rocosos. Durante el Paleozoico, los Graptolithina evolucionaron r\u00e1pidamente, generando numerosas especies con morfolog\u00edas distintivas. Los ge\u00f3logos brit\u00e1nicos, por ejemplo, han dividido las rocas del Ordov\u00edcico y Sil\u00farico en biozonas, muchas de las cuales representan intervalos de menos de un mill\u00f3n de a\u00f1os. Una glaciaci\u00f3n global al final del Ordov\u00edcico elimin\u00f3 la mayor\u00eda de las especies de Graptolithina existentes en ese momento. Las especies que vivieron durante el Sil\u00farico descend\u00edan de solo una o dos especies que lograron sobrevivir a esa crisis clim\u00e1tica. Adem\u00e1s de su utilidad para datar rocas, los Graptolithina tambi\u00e9n se utilizan para estimar la profundidad y la temperatura del agua en la que viv\u00edan, ya que diferentes grupos de Graptolithina prefer\u00edan distintos ambientes marinos.<\/p>\n<p>Los f\u00f3siles de Graptolithina se encuentran con frecuencia en pizarras y arcillas, rocas que suelen formarse en aguas profundas con poca circulaci\u00f3n, escaso ox\u00edgeno y ausencia de organismos excavadores. En estos ambientes, los Graptolithina planct\u00f3nicos muertos se hund\u00edan hasta el fondo y quedaban enterrados r\u00e1pidamente en sedimentos pobres en ox\u00edgeno, lo que favorec\u00eda su preservaci\u00f3n. Aunque los Graptolithina tambi\u00e9n se encuentran en calizas y s\u00edlex, estas rocas suelen formarse en condiciones m\u00e1s favorables para la vida bent\u00f3nica, lo que implica que muchos Graptolithina depositados all\u00ed fueron devorados antes de fosilizarse. Los f\u00f3siles de Graptolithina suelen aparecer aplastados dentro de las rocas, aunque algunos se conservan en tres dimensiones cuando se infiltran en pirita f\u00e9rrica, lo que permite observar detalles excepcionales de su estructura colonial.<\/p>\n<p>Presentan una gran variedad de formas, aunque las m\u00e1s comunes son las dendr\u00edticas o ramificadas, como Dictyonema, las formas laminares o en abanico, y las formas en \u201cdiapas\u00f3n\u201d, como Didymograptus murchisoni. Debido a su aspecto lineal y ramificado, los restos de Graptolithina pueden confundirse f\u00e1cilmente con f\u00f3siles de plantas por observadores inexpertos. Los Graptolithina suelen conservarse como una pel\u00edcula negra carbonizada sobre la superficie de la roca o como una pel\u00edcula gris clara en rocas tect\u00f3nicamente deformadas. A veces son dif\u00edciles de ver, pero bajo una luz rasante se revelan como trazos brillantes. Tambi\u00e9n existen Graptolithina f\u00f3siles piritizados, cuya preservaci\u00f3n met\u00e1lica permite observar detalles excepcionales.<\/p>\n<p>Graptolithina, con su extraordinaria diversidad, su importancia como f\u00f3siles gu\u00eda y su papel clave en la reconstrucci\u00f3n de los ecosistemas paleozoicos, constituye uno de los grupos f\u00f3siles m\u00e1s valiosos para la paleontolog\u00eda. Su registro detallado permite comprender tanto la evoluci\u00f3n de los hemicordados como los cambios ambientales que afectaron a los mares del Ordov\u00edcico y Sil\u00farico.[\/et_pb_text][et_pb_divider color=\u00bb#999999&#8243; admin_label=\u00bbSeparador\u00bb _builder_version=\u00bb4.27.0&#8243; _module_preset=\u00bbdefault\u00bb custom_margin=\u00bb||||false|false\u00bb custom_padding=\u00bb||||false|false\u00bb global_colors_info=\u00bb{}\u00bb][\/et_pb_divider][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=\u00bb1&#8243; custom_padding_last_edited=\u00bboff|desktop\u00bb admin_label=\u00bbApartados\u00bb _builder_version=\u00bb4.27.0&#8243; custom_margin=\u00bb||||false|false\u00bb custom_padding=\u00bb0px||0px||true|false\u00bb custom_padding_tablet=\u00bb||||false|false\u00bb custom_padding_phone=\u00bb||||false|false\u00bb collapsed=\u00bbon\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_row column_structure=\u00bb1_2,1_2&#8243; 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diferentes&#8230;<\/p>\n","protected":false},"author":1,"featured_media":9425,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[17],"tags":[],"class_list":["post-9275","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fauna-del-ordovicio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Graptolithina | Se derivaron a partir de los graptolitos<\/title>\n<meta name=\"description\" content=\"Durante la era Paleozoica el Graptolithina evolucion\u00f3 dando lugar a otras muchas variantes de especies diferentes.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta 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