{"id":9099,"date":"2025-11-24T14:47:09","date_gmt":"2025-11-24T13:47:09","guid":{"rendered":"https:\/\/clientes.munecarusa.com\/mp\/?p=9099"},"modified":"2026-02-18T12:17:38","modified_gmt":"2026-02-18T11:17:38","slug":"megacheira","status":"publish","type":"post","link":"https:\/\/clientes.munecarusa.com\/mp\/megacheira\/","title":{"rendered":"Megacheira"},"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=\u00bb4.27.4&#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>Hou &#038; Bergstr\u00f6m, 1997<\/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 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=\"Megacheira\" width=\"30\" height=\"50\" \/><\/h2>\n<p>Megacheira, cuyo nombre proviene del griego antiguo \u03bc\u03ad\u03b3\u03b1\u03c2 (m\u00e9gas, \u201cgrande\u201d) y \u03c7\u03b5\u03af\u03c1 (khe\u00edr, \u201cmano\u201d), es un grupo extinto de artr\u00f3podos depredadores que se caracterizan por poseer los llamados \u201cgrandes ap\u00e9ndices\u201d, unas estructuras espinosas y prominentes que constituyen su rasgo anat\u00f3mico m\u00e1s distintivo. Este nombre no es casual: desde su descubrimiento, estos animales han sido reconocidos por la presencia de un par de ap\u00e9ndices cef\u00e1licos excepcionalmente desarrollados, que se proyectan hacia adelante como aut\u00e9nticas herramientas de captura, manipulaci\u00f3n o percepci\u00f3n. La posici\u00f3n taxon\u00f3mica de Megacheira ha sido objeto de un debate prolongado y complejo, ya que su morfolog\u00eda combina caracter\u00edsticas que podr\u00edan situarlos tanto dentro del grupo troncal de los euartr\u00f3podos como dentro del grupo troncal de los quelicerados.[\/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\/Megacheira.webp\u00bb alt=\u00bbMegacheira\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; _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=\u00bb4.27.4&#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 C\u00c1MBRICO<\/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; toggle_font_size_tablet=\u00bb19px\u00bb toggle_font_size_phone=\u00bb16px\u00bb toggle_font_size_last_edited=\u00bbon|phone\u00bb body_font_size_tablet=\u00bb16px\u00bb body_font_size_phone=\u00bb14px\u00bb body_font_size_last_edited=\u00bbon|phone\u00bb global_colors_info=\u00bb{}\u00bb theme_builder_area=\u00bbpost_content\u00bb sticky_enabled=\u00bb0&#8243;][et_pb_accordion_item title=\u00bbEra Geol\u00f3gica\u00bb open=\u00bbon\u00bb _builder_version=\u00bb4.27.4&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb theme_builder_area=\u00bbpost_content\u00bb]Era: Paleozoica<br \/>\nPeriodo: C\u00e1mbrico[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbDescubridor\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb hover_enabled=\u00bb0&#8243; global_colors_info=\u00bb{}\u00bb theme_builder_area=\u00bbpost_content\u00bb open=\u00bboff\u00bb sticky_enabled=\u00bb0&#8243;]Hou &#038; Bergstr\u00f6m, 1997[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbOrigen\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb hover_enabled=\u00bb0&#8243; global_colors_info=\u00bb{}\u00bb theme_builder_area=\u00bbpost_content\u00bb open=\u00bboff\u00bb sticky_enabled=\u00bb0&#8243;]Francia[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbGrupo\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb hover_enabled=\u00bb0&#8243; global_colors_info=\u00bb{}\u00bb theme_builder_area=\u00bbpost_content\u00bb open=\u00bboff\u00bb sticky_enabled=\u00bb0&#8243;]Artr\u00f3podo[\/et_pb_accordion_item][et_pb_accordion_item title=\u00bbFamilia\u00bb _builder_version=\u00bb4.27.5&#8243; _module_preset=\u00bbdefault\u00bb hover_enabled=\u00bb0&#8243; global_colors_info=\u00bb{}\u00bb theme_builder_area=\u00bbpost_content\u00bb open=\u00bboff\u00bb sticky_enabled=\u00bb0&#8243;]Tanglangia[\/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; 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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; title_font_size_tablet=\u00bb19px\u00bb title_font_size_phone=\u00bb16px\u00bb title_font_size_last_edited=\u00bbon|phone\u00bb number_font_size_tablet=\u00bb70px\u00bb number_font_size_phone=\u00bb60px\u00bb number_font_size_last_edited=\u00bbon|phone\u00bb global_colors_info=\u00bb{}\u00bb theme_builder_area=\u00bbpost_content\u00bb sticky_enabled=\u00bb0&#8243;][\/et_pb_number_counter][et_pb_button button_url=\u00bbhttps:\/\/clientes.munecarusa.com\/mp\/fauna-cambrico\/#volver\u00bb button_text=\u00bbFauna del C\u00e1mbrico\u00bb button_alignment=\u00bbleft\u00bb _builder_version=\u00bb4.27.4&#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 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;]La homolog\u00eda de estos grandes ap\u00e9ndices con los ap\u00e9ndices cef\u00e1licos de otros artr\u00f3podos \u2014como los quel\u00edceros de los quelicerados o las antenas de los mandibulados\u2014 tambi\u00e9n ha sido motivo de controversia, lo que refleja la dificultad de interpretar estructuras tan antiguas y \u00fanicas. A pesar de estas incertidumbres, los megacheiras est\u00e1n bien documentados en ambientes marinos de todo el mundo desde el C\u00e1mbrico inferior hasta el Ordov\u00edcico superior, lo que demuestra que fueron un grupo exitoso y ampliamente distribuido durante decenas de millones de a\u00f1os.<\/p>\n<p>Los megacheiras se definen por la presencia de grandes ap\u00e9ndices unirr\u00e1meos, es decir, no ramificados, que constituyen su primer par de ap\u00e9ndices cef\u00e1licos. Estos ap\u00e9ndices est\u00e1n formados por varios segmentos o pod\u00f3meros, y presentan una organizaci\u00f3n muy particular: los uno o dos segmentos proximales, los m\u00e1s cercanos al cuerpo, carecen de espinas, aunque algunos investigadores han argumentado que el supuesto primer pod\u00f3mero proximal podr\u00eda ser en realidad una membrana artrodial flexible. Los segmentos distales, en cambio, suelen presentar cada uno una espina \u00fanica que apunta hacia arriba y que est\u00e1 unida al extremo distal del segmento. Esta disposici\u00f3n de espinas alineadas confiere a los ap\u00e9ndices un aspecto amenazador y sugiere una funci\u00f3n depredadora. Los segmentos proximales sin espinas suelen estar conectados a los segmentos distales mediante una articulaci\u00f3n que recuerda a un codo, permitiendo que el ap\u00e9ndice se curve hacia arriba y hacia adelante. Esta articulaci\u00f3n habr\u00eda permitido movimientos r\u00e1pidos y precisos, ideales para capturar presas peque\u00f1as o para manipular objetos en el entorno marino.<\/p>\n<p>Los grandes ap\u00e9ndices han sido interpretados como extremidades rapaces implicadas en la depredaci\u00f3n, y en algunos g\u00e9neros, como Yohoia, su estructura se ha comparado con los maxil\u00edpedos rapaces del camar\u00f3n mantis, conocidos por su velocidad y potencia. Esta comparaci\u00f3n sugiere que los megacheiras podr\u00edan haber sido depredadores activos, capaces de atrapar presas mediante movimientos r\u00e1pidos y precisos. Sin embargo, la funci\u00f3n de estos ap\u00e9ndices no se limita necesariamente a la depredaci\u00f3n. En los megacheiras leancho\u00edlidos, como Leanchoilia y Yawunik, las espinas de los ap\u00e9ndices se alargan formando estructuras similares a flagelos, lo que sugiere una funci\u00f3n sensorial adem\u00e1s de la depredadora. Estos flagelos podr\u00edan haber detectado vibraciones, corrientes de agua o se\u00f1ales qu\u00edmicas, proporcionando al animal informaci\u00f3n crucial sobre su entorno y sobre la presencia de posibles presas o depredadores.<\/p>\n<p>El cuerpo de un megacheira est\u00e1 dividido en dos regiones principales: la cabeza y el tronco. Las extremidades birr\u00e1meas del tronco son hom\u00f3nimas, lo que significa que muestran poca diferenciaci\u00f3n entre s\u00ed. Cada extremidad birr\u00e1mea est\u00e1 compuesta por un end\u00f3podo, la rama inferior similar a una pata, t\u00edpicamente dividida en siete segmentos o pod\u00f3meros, y un ex\u00f3podo en forma de paleta, la rama superior, bordeado por l\u00e1minas delgadas que probablemente funcionaban como superficies natatorias o respiratorias. Esta combinaci\u00f3n de end\u00f3podos locomotores y ex\u00f3podos laminares sugiere que los megacheiras eran animales activos que pod\u00edan nadar mediante movimientos ondulatorios o batidos coordinados de sus extremidades. La morfolog\u00eda del telson, el segmento terminal del cuerpo, es variable entre los distintos g\u00e9neros, lo que indica una diversidad funcional dentro del grupo. Se ha sugerido que las extremidades birr\u00e1meas de algunos megacheiras presentan \u00e9xitos, estructuras que podr\u00edan haber tenido funciones sensoriales o respiratorias adicionales.<\/p>\n<p>Dentro de Megacheira se reconocen varias subdivisiones importantes. Una de ellas es Jianfengiidae, que incluye g\u00e9neros como Fortiforceps, Jianfengia, Sklerolibyon y posiblemente Parapeytoia. Estos organismos se conocen principalmente del C\u00e1mbrico temprano de China y se caracterizan por poseer m\u00e1s de 20 segmentos corporales. Por otro lado, el grupo Cheiromorpha, que contiene g\u00e9neros como Yohoia, Haikoucaris y la familia Leanchoiliidae, est\u00e1 bien documentado en el C\u00e1mbrico temprano y medio de Am\u00e9rica del Norte, China y Australia. Los miembros de Cheiromorpha se distinguen de Jianfengiidae por tener un menor n\u00famero de segmentos corporales, t\u00edpicamente entre 11 y 13. La monofilia de Megacheira, es decir, la idea de que todos los megacheiras forman un grupo natural derivado de un ancestro com\u00fan exclusivo, es incierta. Algunos estudios han recuperado al grupo como parafil\u00e9tico, lo que significa que podr\u00eda incluir organismos que no comparten un ancestro com\u00fan inmediato o que excluye algunos descendientes de ese ancestro. El megacheiran inequ\u00edvoco m\u00e1s reciente es Lomankus, un leancho\u00edlido del Ordov\u00edcico superior de Am\u00e9rica del Norte, lo que indica que el grupo persisti\u00f3 durante un largo per\u00edodo antes de desaparecer.<\/p>\n<p>Parapeytoia, del C\u00e1mbrico de China, fue inicialmente malinterpretado como un radiodonte debido a la presencia de grandes ap\u00e9ndices frontales. Sin embargo, estudios posteriores sugirieron que podr\u00eda ser un miembro de Megacheira, aunque esta interpretaci\u00f3n sigue siendo debatida. Otros posibles megacheiras incluyen Enalikter, descrito a partir de f\u00f3siles del Sil\u00farico del Reino Unido, y Bundenbachiellus, del Dev\u00f3nico temprano de Alemania. Ambos presentan grandes ap\u00e9ndices cef\u00e1licos similares a los de los megacheiras, pero su relaci\u00f3n con el grupo ha sido cuestionada debido a la homolog\u00eda incierta de sus ap\u00e9ndices. Tambi\u00e9n se ha sugerido que Kootenichela podr\u00eda ser una quimera formada por partes de varios taxones de artr\u00f3podos, lo que complica a\u00fan m\u00e1s su clasificaci\u00f3n. La inclusi\u00f3n previa de algunos g\u00e9neros \u201cbivalvos\u201d, como Forfexicaris, Ovalicephalus y Occacaris, dentro de Megacheira fue cuestionada por investigaciones posteriores que demostraron que sus caracter\u00edsticas no eran compatibles con las del grupo. Incluso Oelandocaris, un tax\u00f3n del C\u00e1mbrico tard\u00edo considerado t\u00edpicamente un pariente de los crust\u00e1ceos, ha sido sugerido en algunos estudios como un posible megacheiran, aunque esta interpretaci\u00f3n tambi\u00e9n es controvertida.<\/p>\n<p>La posici\u00f3n evolutiva de los megacheiras dentro del \u00e1rbol de los artr\u00f3podos es uno de los aspectos m\u00e1s debatidos. Una hip\u00f3tesis sugiere que los megacheiras son quelicerados del grupo madre, es decir, miembros de un linaje ancestral que dio origen a los quelicerados modernos, un grupo que incluye a los ar\u00e1cnidos, las ara\u00f1as marinas y los cangrejos herradura, entre otros. Esta hip\u00f3tesis se basa en la similitud morfol\u00f3gica entre los grandes ap\u00e9ndices de los megacheiras y los quel\u00edceros de los quelicerados modernos, as\u00ed como en la neuroanatom\u00eda y en la presencia de un labrum reducido que se asemeja al de los quelicerados actuales. Los defensores de esta hip\u00f3tesis argumentan que los quel\u00edceros y los grandes ap\u00e9ndices son estructuras hom\u00f3logas, es decir, derivadas de un mismo ap\u00e9ndice ancestral.<\/p>\n<p>Otros estudios, sin embargo, sugieren que los megacheiras son artr\u00f3podos del grupo troncal, bas\u00e1ndose en la idea de que los grandes ap\u00e9ndices son hom\u00f3logos a los ap\u00e9ndices frontales de artr\u00f3podos del grupo troncal como Isoxys y los radiodontes. Esta interpretaci\u00f3n es controvertida, ya que otros autores han propuesto que los ap\u00e9ndices frontales de los radiodontes son hom\u00f3logos al labrum de los artr\u00f3podos modernos, lo que complica la comparaci\u00f3n. Adem\u00e1s, algunos estudios basados en la anatom\u00eda del cerebro y del sistema nervioso han sugerido que, mientras algunos megacheiras podr\u00edan ser quelicerados del tallo, otros podr\u00edan ser mandibulados del tallo, lo que implica que el grupo podr\u00eda no ser monofil\u00e9tico y que sus miembros podr\u00edan representar distintas ramas tempranas dentro de la evoluci\u00f3n de los artr\u00f3podos.[\/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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global_colors_info=\u00bb{}\u00bb]Paleozoico o tambi\u00e9n era Primaria es una divisi\u00f3n de la escala temporal geol\u00f3gica de m\u00e1s de 290 millones de a\u00f1os de duraci\u00f3n, que se inici\u00f3 hace 542 millones de a\u00f1os. y acab\u00f3 hace unos 251 millones de a\u00f1os.[\/et_pb_blurb][et_pb_button button_url=\u00bbhttps:\/\/clientes.munecarusa.com\/mp\/era-paleozoica\/\u00bb button_text=\u00bbLeer M\u00e1s&#8230;\u00bb _builder_version=\u00bb4.27.2&#8243; _module_preset=\u00bbdefault\u00bb custom_button=\u00bbon\u00bb button_text_size=\u00bb18px\u00bb button_text_color=\u00bb#FFFFFF\u00bb button_bg_color=\u00bb#006633&#8243; button_letter_spacing=\u00bb1px\u00bb button_font=\u00bb|600|||||||\u00bb button_icon=\u00bb&#x24;||divi||400&#8243; button_icon_color=\u00bb#FFFFFF\u00bb custom_margin=\u00bb|||45px|false|false\u00bb button_text_size_tablet=\u00bb16px\u00bb button_text_size_phone=\u00bb14px\u00bb button_text_size_last_edited=\u00bbon|phone\u00bb box_shadow_style=\u00bbpreset3&#8243; 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header_font_size=\u00bb28px\u00bb body_text_align=\u00bbjustify\u00bb body_text_color=\u00bb#444444&#8243; custom_margin=\u00bb||10px||false|false\u00bb header_font_size_tablet=\u00bb22px\u00bb header_font_size_phone=\u00bb15px\u00bb header_font_size_last_edited=\u00bbon|desktop\u00bb header_line_height_tablet=\u00bb\u00bb header_line_height_phone=\u00bb1.2em\u00bb header_line_height_last_edited=\u00bbon|phone\u00bb body_font_size_tablet=\u00bb16px\u00bb body_font_size_phone=\u00bb14px\u00bb body_font_size_last_edited=\u00bbon|tablet\u00bb body_line_height_tablet=\u00bb1.7em\u00bb body_line_height_phone=\u00bb1.6em\u00bb body_line_height_last_edited=\u00bbon|tablet\u00bb header_text_shadow_style=\u00bbpreset1&#8243; global_colors_info=\u00bb{}\u00bb]Un gran s\u00faper continente Gondwana, se localiza al sur del planeta con tres \u00fanicos continentes, Siberia, B\u00e1ltica y Laurentia, se desplazan hacia el norte. 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