{"id":9929,"date":"2026-01-24T11:26:14","date_gmt":"2026-01-24T10:26:14","guid":{"rendered":"https:\/\/clientes.munecarusa.com\/mp\/?p=9929"},"modified":"2026-01-28T18:50:42","modified_gmt":"2026-01-28T17:50:42","slug":"ichthyostega","status":"publish","type":"post","link":"https:\/\/clientes.munecarusa.com\/mp\/ichthyostega\/","title":{"rendered":"Ichthyostega"},"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; background_enable_color=\u00bboff\u00bb custom_margin_last_edited=\u00bboff|phone\u00bb custom_padding=\u00bb||0px||false|false\u00bb custom_padding_tablet=\u00bb27px||0px||false|false\u00bb custom_padding_phone=\u00bb37px||||false|false\u00bb collapsed=\u00bbon\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_row make_equal=\u00bbon\u00bb custom_padding_last_edited=\u00bbon|phone\u00bb _builder_version=\u00bb4.27.2&#8243; background_size=\u00bbinitial\u00bb background_position=\u00bbtop_left\u00bb background_repeat=\u00bbrepeat\u00bb custom_margin=\u00bb||||false|false\u00bb custom_padding=\u00bb||0px||false|false\u00bb custom_padding_tablet=\u00bb||0px||false|false\u00bb custom_padding_phone=\u00bb||10px||false|false\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_column type=\u00bb4_4&#8243; _builder_version=\u00bb4.16&#8243; custom_padding=\u00bb|||\u00bb global_colors_info=\u00bb{}\u00bb custom_padding__hover=\u00bb|||\u00bb][et_pb_post_title meta=\u00bboff\u00bb featured_image=\u00bboff\u00bb _builder_version=\u00bb4.27.4&#8243; _module_preset=\u00bbdefault\u00bb title_font=\u00bb|600||on|||||\u00bb title_text_align=\u00bbcenter\u00bb title_text_color=\u00bb#000000&#8243; title_font_size=\u00bb70px\u00bb title_letter_spacing=\u00bb1px\u00bb custom_margin=\u00bb||10px||false|false\u00bb animation_style=\u00bbslide\u00bb animation_direction=\u00bbbottom\u00bb title_font_size_tablet=\u00bb50px\u00bb title_font_size_phone=\u00bb20px\u00bb title_font_size_last_edited=\u00bbon|phone\u00bb title_text_shadow_style=\u00bbpreset1&#8243; global_colors_info=\u00bb{}\u00bb][\/et_pb_post_title][et_pb_text content_last_edited=\u00bboff|phone\u00bb _builder_version=\u00bb4.27.5&#8243; header_4_font=\u00bb|700||on|||||\u00bb header_4_text_align=\u00bbcenter\u00bb header_4_text_color=\u00bb#ff6600&#8243; header_4_font_size=\u00bb30px\u00bb header_4_line_height=\u00bb1.4em\u00bb background_size=\u00bbinitial\u00bb background_position=\u00bbtop_left\u00bb background_repeat=\u00bbrepeat\u00bb text_orientation=\u00bbjustified\u00bb animation_style=\u00bbzoom\u00bb text_font_size_last_edited=\u00bboff|phone\u00bb text_line_height_last_edited=\u00bboff|phone\u00bb header_4_font_size_tablet=\u00bb22px\u00bb header_4_font_size_phone=\u00bb11px\u00bb header_4_font_size_last_edited=\u00bbon|phone\u00bb header_4_text_shadow_style=\u00bbpreset1&#8243; global_colors_info=\u00bb{}\u00bb header_4_text_color__hover_enabled=\u00bboff|hover\u00bb text_text_color__hover_enabled=\u00bboff|desktop\u00bb]<\/p>\n<h4>Jarvik, 1952<\/h4>\n<p>[\/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-20px||0px||false|false\u00bb custom_padding=\u00bb||||false|false\u00bb animation_style=\u00bbslide\u00bb global_colors_info=\u00bb{}\u00bb][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row _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=\u00bb4_4&#8243; _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb animation_style=\u00bbzoom\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 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]<\/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=\"Ichthyostega\" width=\"30\" height=\"50\" \/><\/h2>\n<p>Ichthyostega (del griego \u201cpez con techo\u201d) es un g\u00e9nero extinto de tetr\u00e1podo que vivi\u00f3 durante el Dev\u00f3nico Superior, concretamente en el Fameniano, hace entre 367 y 362,5 millones de a\u00f1os. Fue el primer tetr\u00e1podo basal descubierto y uno de los primeros vertebrados en mostrar extremidades con dedos en lugar de aletas lobuladas. Aunque tradicionalmente se pens\u00f3 que utilizaba estas extremidades para desplazarse por tierra, hoy se considera m\u00e1s probable que realizara movimientos similares a los de ciertos reptiles acu\u00e1ticos, empleando las patas para impulsarse bajo el agua en ambientes pantanosos. Esto sugiere que Ichthyostega no era un habitante terrestre pleno, sino un animal fundamentalmente acu\u00e1tico con incursiones limitadas fuera del agua.[\/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\/2026\/01\/Ichthyostega.webp\u00bb alt=\u00bbIchthyostega\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=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb custom_margin=\u00bb25px||||false|false\u00bb global_colors_info=\u00bb{}\u00bb][\/et_pb_image][et_pb_code disabled_on=\u00bboff|off|off\u00bb admin_label=\u00bbMe gusta\u00bb _builder_version=\u00bb4.27.4&#8243; _module_preset=\u00bbdefault\u00bb custom_margin=\u00bb-20px||||false|false\u00bb global_colors_info=\u00bb{}\u00bb]<div class=\"et_social_networks et_social_1col et_social_slide et_social_rectangle et_social_left et_social_withcounts et_social_shortcode_0 et_social_mobile_on et_social_withnetworknames et_social_outer_dark\">\n\t\t\t\t\t<style type=\"text\/css\">.et_monarch .et_social_shortcode_0 li,.et_monarch .et_social_shortcode_0.et_social_circle ul li i.et_social_icon { background: #ff0000; } .et_monarch .et_social_shortcode_0.et_social_rounded .et_social_icons_container li:hover, .et_monarch .et_social_shortcode_0.et_social_rectangle .et_social_icons_container li:hover, .et_monarch .et_social_shortcode_0.et_social_circle .et_social_icons_container li:hover i.et_social_icon { background: #660000 !important; } .et_monarch .et_social_shortcode_0 .et_social_icons_container li:hover .et_social_icon, .et_monarch .et_social_shortcode_0 .et_social_networks .et_social_icons_container li:hover .et_social_network_label, .et_monarch .et_social_shortcode_0 .et_social_icons_container li:hover .et_social_networkname, .et_monarch .et_social_rounded.et_social_shortcode_0 .et_social_icons_container li:hover .et_social_count, .et_monarch .et_social_rectangle.et_social_shortcode_0 .et_social_icons_container li:hover .et_social_count { color: #ffffff !important; }<\/style>\n\t\t\t\t\t\n\t\t\t\t\t<ul class=\"et_social_icons_container\"><li class=\"et_social_like\">\n\t\t\t\t\t\t<a href=\"#\" class=\"et_social_follow\" data-social_name=\"like\" data-social_type=\"like\" data-post_id=\"0\" target=\"_blank\">\n\t\t\t\t\t\t\t<i class=\"et_social_icon et_social_icon_like\"><\/i>\n\t\t\t\t\t\t\t<div class=\"et_social_network_label\"><div class=\"et_social_networkname\">Me gusta<\/div><div class=\"et_social_count\">\n\t\t\t\t\t\t<span>0<\/span>\n\t\t\t\t\t\t<span class=\"et_social_count_label\">Likes<\/span>\n\t\t\t\t\t<\/div><\/div>\n\t\t\t\t\t\t\t<span class=\"et_social_overlay\"><\/span>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/li><\/ul>\n\t\t\t\t<\/div>[\/et_pb_code][et_pb_post_title meta=\u00bboff\u00bb featured_image=\u00bboff\u00bb _builder_version=\u00bb4.27.4&#8243; _module_preset=\u00bbdefault\u00bb title_font=\u00bb|600||on|||||\u00bb title_text_align=\u00bbcenter\u00bb title_text_color=\u00bb#000000&#8243; title_font_size=\u00bb35px\u00bb title_letter_spacing=\u00bb1px\u00bb custom_margin=\u00bb||0px||false|false\u00bb animation_direction=\u00bbbottom\u00bb title_font_size_tablet=\u00bb30px\u00bb title_font_size_phone=\u00bb20px\u00bb title_font_size_last_edited=\u00bbon|desktop\u00bb global_colors_info=\u00bb{}\u00bb][\/et_pb_post_title][et_pb_text content_last_edited=\u00bboff|phone\u00bb disabled_on=\u00bboff|off|off\u00bb admin_label=\u00bbSubt\u00edtulo\u00bb _builder_version=\u00bb4.27.5&#8243; header_2_font=\u00bb||||||||\u00bb header_3_font=\u00bb|700||on|||||\u00bb header_3_text_align=\u00bbcenter\u00bb header_3_text_color=\u00bb#444444&#8243; header_3_font_size=\u00bb30px\u00bb header_4_font=\u00bb||||||||\u00bb background_size=\u00bbinitial\u00bb background_position=\u00bbtop_left\u00bb background_repeat=\u00bbrepeat\u00bb text_font_size_last_edited=\u00bboff|phone\u00bb text_line_height_last_edited=\u00bboff|desktop\u00bb header_2_font_size_last_edited=\u00bboff|phone\u00bb header_3_font_size_tablet=\u00bb25px\u00bb header_3_font_size_phone=\u00bb15px\u00bb header_3_font_size_last_edited=\u00bbon|phone\u00bb header_4_font_size_last_edited=\u00bboff|phone\u00bb global_colors_info=\u00bb{}\u00bb header_4_text_color__hover_enabled=\u00bboff|hover\u00bb]<\/p>\n<h3>FAUNA DEL DEV\u00d3NICO<\/h3>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=\u00bb1_3&#8243; _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb animation_style=\u00bbslide\u00bb animation_direction=\u00bbright\u00bb sticky_limit_top=\u00bbrow\u00bb sticky_limit_bottom=\u00bbrow\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_accordion db_closeable=\u00bbon\u00bb db_initial_state=\u00bball_closed\u00bb open_toggle_text_color=\u00bb#FFFFFF\u00bb open_toggle_background_color=\u00bb#660000&#8243; closed_toggle_text_color=\u00bb#FFFFFF\u00bb closed_toggle_background_color=\u00bb#ff6600&#8243; toggle_icon=\u00bb&#x50;||divi||400&#8243; icon_color=\u00bb#FFFFFF\u00bb use_icon_font_size=\u00bbon\u00bb icon_font_size=\u00bb25px\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb toggle_text_color=\u00bb#FFFFFF\u00bb toggle_font=\u00bb|700|||||||\u00bb toggle_font_size=\u00bb22px\u00bb toggle_letter_spacing=\u00bb1px\u00bb body_font=\u00bb|600|||||||\u00bb body_text_color=\u00bb#FFFFFF\u00bb background_enable_color=\u00bboff\u00bb custom_margin=\u00bb25px||||false|false\u00bb custom_margin_tablet=\u00bb0px||||false|false\u00bb custom_margin_phone=\u00bb0px||||false|false\u00bb custom_margin_last_edited=\u00bbon|tablet\u00bb hover_enabled=\u00bb0&#8243; global_colors_info=\u00bb{}\u00bb toggle_font_size_last_edited=\u00bbon|phone\u00bb sticky_enabled=\u00bb0&#8243; toggle_font_size_tablet=\u00bb19px\u00bb toggle_font_size_phone=\u00bb16px\u00bb body_font_size_last_edited=\u00bbon|phone\u00bb body_font_size_tablet=\u00bb16px\u00bb body_font_size_phone=\u00bb14px\u00bb][et_pb_accordion_item title=\u00bbEra Geol\u00f3gica\u00bb open=\u00bbon\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb]Era: Paleozoica<br \/>\nPeriodo: Dev\u00f3nico[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbDescubridor\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb open=\u00bboff\u00bb]Jarvik, 1952[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbOrigen\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb open=\u00bboff\u00bb]Groenlandia[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbGrupo\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb open=\u00bboff\u00bb]Anfibio[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbFamilia\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb open=\u00bboff\u00bb]Ichthyostegidae[\/et_pb_accordion_item][\/et_pb_accordion][et_pb_counters bar_bg_color=\u00bb#ff6600&#8243; _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb title_font=\u00bb|700|||||||\u00bb title_text_color=\u00bb#000000&#8243; title_font_size=\u00bb22px\u00bb title_letter_spacing=\u00bb1px\u00bb percent_font=\u00bb|600|||||||\u00bb percent_text_color=\u00bb#FFFFFF\u00bb percent_font_size=\u00bb18px\u00bb percent_letter_spacing=\u00bb1px\u00bb custom_padding=\u00bb15px||15px||true|false\u00bb hover_enabled=\u00bb0&#8243; global_colors_info=\u00bb{}\u00bb title_font_size_last_edited=\u00bbon|phone\u00bb sticky_enabled=\u00bb0&#8243; title_font_size_tablet=\u00bb19px\u00bb title_font_size_phone=\u00bb16px\u00bb percent_font_size_last_edited=\u00bbon|phone\u00bb percent_font_size_tablet=\u00bb16px\u00bb percent_font_size_phone=\u00bb14px\u00bb][et_pb_counter percent=\u00bb20&#8243; _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb bar_background_color_default=\u00bb#ff6600&#8243; use_percentages=\u00bbon\u00bb]Agresividad[\/et_pb_counter][\/et_pb_counters][et_pb_number_counter title=\u00bbMillones de A\u00f1os\u00bb number=\u00bb365&#8243; percent_sign=\u00bboff\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb title_font=\u00bb|700|||||||\u00bb title_text_align=\u00bbcenter\u00bb title_text_color=\u00bb#FFFFFF\u00bb title_font_size=\u00bb22px\u00bb title_letter_spacing=\u00bb1px\u00bb number_font=\u00bb|700|||||||\u00bb number_text_color=\u00bb#FFFFFF\u00bb number_font_size=\u00bb80px\u00bb number_letter_spacing=\u00bb1px\u00bb number_line_height=\u00bb100px\u00bb background_color=\u00bb#ff6600&#8243; hover_enabled=\u00bb0&#8243; global_colors_info=\u00bb{}\u00bb title_font_size_last_edited=\u00bbon|phone\u00bb sticky_enabled=\u00bb0&#8243; title_font_size_tablet=\u00bb19px\u00bb title_font_size_phone=\u00bb16px\u00bb number_font_size_last_edited=\u00bbon|phone\u00bb number_font_size_tablet=\u00bb70px\u00bb number_font_size_phone=\u00bb60px\u00bb][\/et_pb_number_counter][et_pb_button button_url=\u00bbhttps:\/\/clientes.munecarusa.com\/mp\/fauna-devonico\/#volver\u00bb button_text=\u00bbFauna del Dev\u00f3nico\u00bb button_alignment=\u00bbleft\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb custom_button=\u00bbon\u00bb button_text_size=\u00bb22px\u00bb button_text_color=\u00bb#FFFFFF\u00bb button_bg_color=\u00bb#ff6600&#8243; button_border_radius=\u00bb0px\u00bb button_font=\u00bb|700|||||||\u00bb button_icon=\u00bb&#x24;||divi||400&#8243; custom_margin=\u00bb0px||||false|false\u00bb custom_padding=\u00bb15px||15px||true|false\u00bb button_text_size_tablet=\u00bb19px\u00bb button_text_size_phone=\u00bb16px\u00bb button_text_size_last_edited=\u00bbon|phone\u00bb button_icon_last_edited=\u00bboff|desktop\u00bb button_on_hover_phone=\u00bbon\u00bb button_on_hover_last_edited=\u00bboff|phone\u00bb custom_css_main_element=\u00bbwidth:100%;\u00bb global_colors_info=\u00bb{}\u00bb button_text_color__hover_enabled=\u00bboff|desktop\u00bb button_bg_color__hover_enabled=\u00bbon|hover\u00bb button_bg_color__hover=\u00bb#660000&#8243; button_bg_enable_color__hover=\u00bbon\u00bb][\/et_pb_button][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb custom_margin=\u00bb||||false|false\u00bb custom_padding=\u00bb30px||||false|false\u00bb animation_style=\u00bbzoom\u00bb global_colors_info=\u00bb{}\u00bb][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 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]En 1932, Gunnar S\u00e4ve\u2011S\u00f6derbergh describi\u00f3 cuatro especies de Ichthyostega procedentes del Dev\u00f3nico Superior de Groenlandia, junto con una especie adicional asignada al g\u00e9nero Ichthyostegopsis (I. wimani). Sin embargo, las diferencias morfol\u00f3gicas entre estas formas son poco marcadas, por lo que podr\u00edan representar sin\u00f3nimos menores, en cuyo caso solo I. stensioei tendr\u00eda validez taxon\u00f3mica. Las variaciones entre especies se basan principalmente en las proporciones del cr\u00e1neo, la forma de las fenestras y los patrones de los huesos craneales. Estas comparaciones se realizaron a partir de 14 espec\u00edmenes recolectados en 1931 por la Expedici\u00f3n Danesa al Este de Groenlandia, a los que se sumaron nuevos hallazgos entre 1933 y 1955.<\/p>\n<p>Ichthyostega est\u00e1 estrechamente relacionado con Acanthostega gunnari, tambi\u00e9n procedente del este de Groenlandia. Aunque su cr\u00e1neo conserva rasgos m\u00e1s propios de los peces que el de Acanthostega, la morfolog\u00eda de sus cinturas escapular y p\u00e9lvica revela estructuras m\u00e1s robustas y mejor adaptadas para soportar el cuerpo fuera del agua. Presentaba adem\u00e1s un mayor n\u00famero de costillas de soporte y v\u00e9rtebras m\u00e1s s\u00f3lidas, con zigap\u00f3fisis bien desarrolladas. A\u00fan se debate si estas caracter\u00edsticas evolucionaron de manera independiente en Ichthyostega, pero en cualquier caso indican que este tetr\u00e1podo era capaz de aventurarse ocasionalmente en tierra firme, a diferencia de formas m\u00e1s primitivas como Elginerpeton u Obruchevichthys, que permanec\u00edan esencialmente acu\u00e1ticas.<\/p>\n<p>El cuerpo de Ichthyostega alcanzaba aproximadamente 1,5 metros de longitud, un tama\u00f1o considerable para un tetr\u00e1podo tan temprano. Su cr\u00e1neo era ancho y aplanado, con los ojos situados dorsalmente, una configuraci\u00f3n t\u00edpica de animales que pasan gran parte del tiempo en el agua. Estaba armado con dientes grandes y robustos, y conservaba un op\u00e9rculo en el margen posterior del cr\u00e1neo que cubr\u00eda las branquias, mientras que el espir\u00e1culo se alojaba en una muesca \u00f3tica situada detr\u00e1s de cada ojo.<\/p>\n<p>Las extremidades eran proporcionalmente grandes en comparaci\u00f3n con las de otros tetr\u00e1podos tempranos, y las posteriores presentaban siete dedos (polidactilia), un rasgo que evidencia la experimentaci\u00f3n evolutiva de la transici\u00f3n del agua a la tierra. El n\u00famero exacto de dedos en las extremidades anteriores sigue siendo desconocido debido a la ausencia de f\u00f3siles completos de la mano. Adem\u00e1s, Ichthyostega conservaba una aleta caudal provista de radios \u00f3seos, lo que refuerza su condici\u00f3n de animal predominantemente acu\u00e1tico.<\/p>\n<p>Los primeros tetr\u00e1podos, como Ichthyostega y Acanthostega, se diferenciaban de los peces sarcopterigios \u2014como Eusthenopteron o Panderichthys\u2014 por un conjunto creciente de adaptaciones a la vida terrestre. Aunque los crosopterigios pose\u00edan pulmones, depend\u00edan principalmente de las branquias para obtener ox\u00edgeno; en cambio, Ichthyostega parece haber utilizado sus pulmones como principal \u00f3rgano respiratorio. Otra diferencia clave resid\u00eda en la piel: mientras que los crosopterigios ten\u00edan una cubierta que no evitaba la p\u00e9rdida de agua, los primeros tetr\u00e1podos desarrollaron una piel m\u00e1s eficaz para conservar los fluidos corporales y resistir la desecaci\u00f3n.<\/p>\n<p>En cuanto a la locomoci\u00f3n, los peces sarcopterigios empleaban el cuerpo y la cola para impulsarse, utilizando las aletas solo como elementos estabilizadores. Ichthyostega, por el contrario, habr\u00eda utilizado principalmente sus extremidades anteriores para desplazarse, reservando la cola para mantener el equilibrio. Este cambio funcional refleja una transici\u00f3n crucial en la evoluci\u00f3n de los vertebrados, en la que las extremidades comenzaron a asumir un papel locomotor m\u00e1s activo, incluso en animales que segu\u00edan siendo mayoritariamente acu\u00e1ticos.<\/p>\n<p>El tama\u00f1o adulto de Ichthyostega, cercano a 1,5 metros, habr\u00eda dificultado una locomoci\u00f3n terrestre eficiente. Su caja tor\u00e1cica era masiva, formada por costillas anchas y superpuestas que limitaban la flexibilidad lateral del tronco. La columna vertebral era r\u00edgida y robusta, y las extremidades anteriores parec\u00edan lo suficientemente fuertes como para impulsar al animal en el agua, pero no necesariamente para sostener su peso en tierra. Los miembros posteriores, m\u00e1s peque\u00f1os y menos potentes, dif\u00edcilmente habr\u00edan contribuido a soportar la masa corporal. En conjunto, esta anatom\u00eda sugiere un animal capaz de realizar movimientos limitados fuera del agua, pero no adaptado para caminar de forma sostenida.<\/p>\n<p>Las extremidades delanteras, sin embargo, pose\u00edan el rango de movimiento necesario para empujar el cuerpo hacia arriba y hacia adelante, permitiendo un desplazamiento terrestre lento y s\u00edncrono, m\u00e1s parecido al de un Boleophthalmus dussumieri o al de un pinn\u00edpedo moderno que al de un tetr\u00e1podo plenamente terrestre. Este patr\u00f3n locomotor habr\u00eda sido \u00fatil para arrastrarse sobre superficies planas, especialmente durante breves incursiones fuera del agua.<\/p>\n<p>Los estudios de Jennifer A. Clack propusieron que Ichthyostega y otros tetr\u00e1podos tempranos pudieron haber pasado parte del tiempo tomando el sol para elevar su temperatura corporal, un comportamiento comparable al de animales actuales como las iguanas marinas de las Gal\u00e1pagos o el gavial. Tras calentarse, habr\u00edan regresado al agua para alimentarse, reproducirse o regular su temperatura. Este estilo de vida exige extremidades anteriores robustas capaces de soportar el cuerpo fuera del agua, as\u00ed como una caja tor\u00e1cica y una columna vertebral lo suficientemente fuertes para sostener el peso del animal mientras descansaba apoyado sobre el abdomen, de manera similar a los cocodrilos modernos. Investigaciones recientes sugieren adem\u00e1s que los juveniles eran m\u00e1s acu\u00e1ticos que los adultos, lo que abre la posibilidad de que Ichthyostega solo abandonara el agua de forma regular al alcanzar la madurez.<\/p>\n<p>El agua segu\u00eda siendo indispensable para su reproducci\u00f3n, ya que los huevos de los primeros tetr\u00e1podos no pod\u00edan sobrevivir en ambientes secos. Las larvas tambi\u00e9n depend\u00edan del medio acu\u00e1tico, y la fertilizaci\u00f3n probablemente era externa, como en muchos anfibios primitivos. Con el tiempo, los vertebrados terrestres desarrollaron dos estrategias de fertilizaci\u00f3n interna: una directa, presente en todos los amniotas y algunos anfibios, y otra indirecta, como la observada en numerosas salamandras que depositan un espermat\u00f3foro que luego es recogido por la hembra.<\/p>\n<p>Los ichthyostegalianos \u2014Elginerpeton, Acanthostega, Ichthyostega, entre otros\u2014 fueron finalmente reemplazados por los temnosp\u00f3ndilos y los antracosaurios, como Eryops, grupos que desarrollaron una locomoci\u00f3n terrestre m\u00e1s eficiente. Hasta 2002 exist\u00eda un vac\u00edo de unos 20 millones de a\u00f1os entre ambos linajes, conocido como el Intervalo de Romer. El hallazgo de Pederpes, un tetr\u00e1podo del Misisipiense inferior de unos 350 millones de a\u00f1os, ayud\u00f3 a cerrar esta brecha al mostrar las primeras adaptaciones claras para caminar en tierra firme.<br \/>\nA lo largo del Dev\u00f3nico Superior, Ichthyostega represent\u00f3 uno de los experimentos evolutivos m\u00e1s significativos en la transici\u00f3n de los vertebrados del agua a la tierra. Su combinaci\u00f3n de rasgos acu\u00e1ticos \u2014como la aleta caudal con radios \u00f3seos, el op\u00e9rculo y la posici\u00f3n dorsal de los ojos\u2014 junto con adaptaciones incipientes a la vida terrestre \u2014extremidades robustas, pulmones funcionales y una caja tor\u00e1cica reforzada\u2014 lo sit\u00faan en un punto intermedio crucial dentro de la evoluci\u00f3n de los tetr\u00e1podos. Aunque no era un caminante terrestre eficiente, su anatom\u00eda revela que pod\u00eda realizar incursiones fuera del agua, probablemente para termorregularse, descansar o explorar entornos marginales.<\/p>\n<p>El estudio de Ichthyostega, junto con el de otros ichthyostegalianos, ha sido fundamental para reconstruir los pasos iniciales de la locomoci\u00f3n terrestre. Su reemplazo posterior por temnosp\u00f3ndilos y antracosaurios m\u00e1s especializados refleja la r\u00e1pida diversificaci\u00f3n de los tetr\u00e1podos tras el Dev\u00f3nico. El descubrimiento de Pederpes en 2002 ayud\u00f3 a cerrar el Intervalo de Romer, completando una parte esencial del registro f\u00f3sil y mostrando c\u00f3mo se desarrollaron las primeras formas de marcha en tierra firme. 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posterior&#8230;<\/p>\n","protected":false},"author":1,"featured_media":9936,"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":[19],"tags":[],"class_list":["post-9929","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fauna-del-devonico"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ichthyostega | Pasaron tiempo tomando el sol<\/title>\n<meta name=\"description\" content=\"Todas las extremidades del Ichthyostega eran muy grandes y pose\u00eda siete dedos en cada extremidad posterior.\" \/>\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 property=\"og:type\" 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